JP2004229874A - Horizontal rotary hook of sewing machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a horizontal rotary hook which can adjust a space between a needle and a needle guard precisely, easily, and quickly. <P>SOLUTION: This horizontal rotary hook comprises an arc-shaped needle guard 7 whose one end is fixed on a hook 2 and the other is a free one, a containing concave 15 formed on the hook 2 which is opened with opposing the free end of the needle guard 7, a movable pin 17 slidably contained in the containing concave 15 whose tip is to abut on the free end of the needle guard 7 from a front of a curve of the needle guard 7, and a position adjusting means to move the movable pin 17 to any sliding position within the containing concave 15. Operating the position adjusting means to slide the movable pin 17 changes deflection toward an external periphery of the needle guard 7 on which the movable pin 17 abuts, thereby a space between a needle 8 vertically reciprocating with holding a needle thread and the needle guard 7 can be adjusted precisely, easily, and quickly. <P>COPYRIGHT: (C)2004,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a horizontal rotary hook of a sewing machine.
[0002]
[Prior art]
A conventional example of the structure of the horizontal rotary hook of the sewing machine will be described with reference to FIGS. FIG. 7 is a front view showing the horizontal rotary hook, and FIG. 8 is a plan view thereof. The horizontal rotary hook 1 includes an outer hook 2, an inner hook 3 housed in an inner hook housing (not shown) formed inside the outer hook 2, and a bobbin 4 inside the inner hook 3. Is stored. The outer shuttle 2 and the inner shuttle 3 are connected to a ring-shaped rail groove (not shown) formed on the inner peripheral surface of the inner shuttle receiving portion and a ring-shaped rail formed on the outer peripheral portion of the inner shuttle 3 (not shown). Are fitted so as to be relatively rotatable. A drive shaft 5 for transmitting a driving force for rotating the outer hook 2 about a central axis is connected to a lower surface on the bottom side of the outer hook 2.
[0003]
A sword point 6 and a needle receiver 7 are provided on the outer periphery of the outer hook 2. The blade point 6 is formed integrally with the outer hook 2 and rotates integrally with the outer hook 2. During this rotation, the tip of the needle 6 hooks the loop portion of the upper thread 9 (see FIG. 3) held by the needle 8 reciprocating in the vertical direction, and moves the upper thread 9 along the outer peripheral surface of the inner hook 3. As a result, the upper thread 9 and the lower thread (not shown) wound on the bobbin 4 are joined together to form a seam.
[0004]
The needle receiving portion 7 is a component formed in an arc shape, one end of which is screwed to the outer hook 2 and the other end is a free end. The needle receiver 7 is positioned so that the needle 8 reciprocating in the vertical direction is located on the outer peripheral side of the needle receiver 7, and is adjusted so that the interval between the needle 8 and the needle 8 is within an appropriate range.
[0005]
FIG. 9 shows a case where the interval between the needle 8 and the needle receiving portion 7 is within an appropriate range, and the interval between the sword tip 6 and the needle 8 is also maintained within the appropriate range. The sword point 6 hooks the loop portion of the upper thread 9 by entering into the undercut 8a formed in the needle 8.
[0006]
FIG. 10 shows a case where the needle 8 and the needle receiving portion 7 are largely separated from each other. When the sewing operation is performed in such a state, a tensile force acts on the needle 8 from the upper thread 9 or the fabric being sewn, and the needle 8 may be largely bent as shown by a broken line. When the needle 8 bends as shown by the broken line, the sword 6 and the needle 8 collide, and the sword 6 and the needle 8 may be damaged.
[0007]
As a cause of the needle 8 and the needle receiving portion 7 largely separating from each other as shown in FIG. 10, the needle 8 may be replaced from a thick one to a thin one, or the needle receiving portion 7 may be bent due to an external force. Conceivable.
[0008]
Therefore, as shown in FIG. 10, when the needle 8 and the needle receiver 7 are largely separated from each other, the needle receiver 7 is bent using a tool such as a screwdriver, and the needle 8 and the needle receiver 7 are connected to each other. Adjust so that the interval between them is appropriate.
[0009]
In addition, as an invention for adjusting the distance between the needle and the needle receiving portion to be appropriate, a position adjustment of the needle receiving portion is performed by changing a tightening amount of the adjusting bolt (for example, Patent There has been proposed an invention in which the position of a needle receiving portion is adjusted by an eccentric cam (for example, see Patent Document 2).
[0010]
[Patent Document 1]
Japanese Utility Model Application Laid-Open No. 64-14378 [Patent Document 2]
Japanese Utility Model Publication No. 3-25742
[Problems to be solved by the invention]
In the horizontal rotary hook of the sewing machine shown in FIGS. 7 to 10, when the distance between the needle 8 and the needle receiving portion 7 is out of an appropriate range, for example, the needle 8 and the needle receiving portion 7 are largely separated from each other. In such a case, the needle receiving portion 7 is adjusted to bend using a tool such as a screwdriver. However, this adjustment requires skill and the adjustment work is troublesome. In addition, it is easy for the needle receiving portion 7 to be damaged at the time of this adjustment, and that the durability of the needle receiving portion 7 is reduced.
[0012]
As disclosed in Patent Document 1, when the position of the needle receiver is adjusted by changing the amount of tightening of the adjustment bolt, the position of the adjustment bolt moves away from the position where the needle and the needle receiver face each other. In addition, since the needle receiver is in a cantilevered state, it is difficult to achieve high adjustment accuracy. Further, since the needle receiver is in the cantilever state, the needle receiving portion is likely to be bent again by the action of an external force during sewing.
[0013]
When the position of the needle receiver is adjusted by rotating the eccentric cam as disclosed in Patent Literature 2, the mechanism for the adjustment is complicated, and the cost is increased. Further, for the adjustment, the bobbin, the inner kettle, and the like housed in the outer kettle must be removed, and the operation is complicated.
[0014]
SUMMARY OF THE INVENTION An object of the present invention is to provide a horizontal rotary hook of a sewing machine capable of accurately, simply and quickly adjusting a distance between a needle and a needle receiving portion, and preventing breakage due to collision between the needle point of the outer hook and the needle. It is to get.
[0015]
[Problems to be solved by the invention]
The invention according to claim 1 is an outer hook that has an inner hook storage portion for housing the inner hook and that is rotatable around an axis, a sword point provided on the outer hook, and an arc-shaped end. A needle receiving portion fixed to the outer hook and the other end being a free end; a storage recess formed in the outer hook and facing the free end of the needle receiving portion; A movable pin that is slidably housed and whose tip abuts against the free end of the needle receiver from the front in the bending direction of the needle receiver, and moves the movable pin to an arbitrary sliding position in the storage recess. And position adjusting means for causing the position to be adjusted.
[0016]
Therefore, when the distance between the needle which holds the upper thread and reciprocates in the vertical direction and the needle receiving portion of the outer hook deviates from an appropriate range, the movable pin is moved by operating the position adjusting means. Specifically, when the distance between the needle and the needle receiver is increased by changing the needle from a thick needle to a thin needle, the tip of the movable pin slides toward the needle receiver. To operate the position adjusting means. As a result, the movable pin slid toward the needle receiver presses the free end of the needle receiver, and the needle receiver flexes so as to expand in the outer peripheral direction, thereby reducing the distance between the needle receiver and the needle. And return to the proper state. On the other hand, if the needle is too close to the needle receiver by changing the needle from a thin needle to a thick needle, the position is adjusted so that the distal end of the movable pin slides backward from the needle receiver. Operate the means. As a result, the amount of deflection of the needle receiver in the outer peripheral direction is reduced, the distance between the needle and the needle receiver is increased, and the needle returns to the proper state. In this manner, the movable pin slides by operating the position adjusting means, and the amount of bending of the needle receiver is adjusted with the sliding, and the distance between the needle and the needle receiver is adjusted. . This interval adjustment can be easily and promptly performed because only the position adjusting means is operated. Further, since the adjustment is performed in a state where both ends of the needle receiver are supported, accurate adjustment is possible. In addition, structurally, the conventionally used needle receiving portion can be continuously used without any change, and the number of components that are newly added or whose shape is changed is reduced. Furthermore, since the movable pin is in pressure contact with the free end of the needle receiver, the needle receiver is less likely to bend even if an external force acts on the needle receiver during sewing.
[0017]
According to a second aspect of the present invention, in the horizontal rotary hook of the sewing machine according to the first aspect of the present invention, the position adjusting means is housed in a deep portion of the housing recess and is in contact with a rear end of the movable pin. A sphere and a tapered portion formed at the tip, the tapered portion is abutted on a portion of the sphere opposite to a contact portion with the movable pin, and the outer hook is movably movable in a direction toward and away from the sphere. It consists of a screwed adjustment screw.
[0018]
Therefore, when the adjusting screw is moved in the direction of coming into contact with or separating from the sphere by turning the adjusting screw, the pressing force acting on the movable pin from the sphere thereby changes, and the movable pin moves toward the needle receiving portion side. It slides or slides backward from the needle receiver. As a result, the amount of deflection of the needle receiver changes in the same manner as in the first aspect of the invention, and the distance between the needle and the needle receiver can be adjusted accurately, simply, and quickly.
[0019]
According to a third aspect of the present invention, in the horizontal rotary hook of the sewing machine according to the first aspect of the present invention, the position adjusting means has a tapered portion formed at a tip thereof, and the tapered portion abuts a rear end of the movable pin. And an adjusting screw screwed to the outer hook so as to be movable in a direction of coming and going with respect to the movable pin.
[0020]
Therefore, when the adjusting screw is moved in the direction in which the tapered portion comes into contact with or separates from the movable pin by turning the adjusting screw, the pressing force acting on the movable pin from the adjusting screw is changed, and the movable pin is moved by the needle holder. Slide toward the side of the unit or in the direction of retracting from the needle receiver. As a result, the amount of deflection of the needle receiver changes in the same manner as in the first aspect of the invention, and the distance between the needle and the needle receiver can be adjusted accurately, simply, and quickly.
[0021]
According to a fourth aspect of the present invention, in the horizontal rotary hook of the sewing machine according to the second or third aspect, the adjusting screw is screwed into a screw hole formed on a bottom side of the outer hook.
[0022]
Therefore, the bottom side of the outer hook where the screw hole is formed is a portion that can be formed to be thicker than other parts of the outer hook, and the diameter of the screw hole is formed to be large. It is possible to use a larger diameter adjusting screw, and the use of the larger diameter adjusting screw increases the durability of the adjusting screw.
[0023]
BEST MODE FOR CARRYING OUT THE INVENTION
A first embodiment of the present invention will be described with reference to FIGS. The same portions as those described in FIGS. 7 to 10 are denoted by the same reference numerals, and description thereof will be omitted. 1 is a front view showing a horizontal rotary hook, FIG. 2 is a plan view thereof, FIG. 3 is a horizontal sectional view showing a part thereof, FIG. 4 is a vertical sectional view showing a part thereof, and FIG. FIG.
[0024]
The basic structure of the horizontal rotary hook of the sewing machine according to the present embodiment is the same as the conventional example described with reference to FIGS. 7 to 10, and the horizontal rotary hook 11 is formed inside the outer hook 2 and the outer hook 2. The inner pot 3 is formed by the inner pot 3 and the like stored in the inner pot storage section 12, and the bobbin 4 is stored inside the inner pot 3. The outer pot 2 and the inner pot 3 are fitted with a ring-shaped rail groove 13 formed on the inner peripheral surface of the inner pot storing portion 12 and a ring-shaped rail 14 formed on the outer peripheral portion of the inner pot 3. Thus, they are relatively rotatably fitted. A drive shaft 5 that transmits a driving force for rotating the outer hook 2 about a central axis is connected to the outer peripheral surface of the bottom of the outer hook 2.
[0025]
A sword point 6 and a needle receiver 7 are provided on the outer periphery of the outer hook 2. The blade tip 6 is formed integrally with the outer hook 2 and rotates integrally with the outer hook 2. At the time of this rotation, the loop portion of the upper thread 9 (see FIG. 3) held by the needle 8 reciprocating in the vertical direction is used as the blade point. 6 hooks.
[0026]
The needle receiving portion 7 is a component formed in an arc shape, one end of which is screwed to the outer hook 2 and the other end of which is a free end, so that the needle 8 which reciprocates vertically in the outer peripheral side thereof is positioned. It is positioned.
[0027]
On the base 2 a on the bottom side of the outer shuttle 2, there is formed a storage recess 15 which is open to face the free end of the needle receiving section 7 screwed to the outer shuttle 2. A spherical body 16 and a movable pin 17 are housed in the housing recess 15. The sphere 16 is positioned at the back of the storage recess 15 and is rotatably stored therein, and the movable pin 17 is slidably stored in the storage recess 15. The rear end of the movable pin 17 abuts on the sphere 16 in the storage recess 15, and the tip of the movable pin 17 extends out of the storage recess 15 and is attached to the free end of the needle receiver 7. Abutting from the front in the bending direction.
[0028]
A screw hole 18 is formed in the base 2a of the outer hook 2 at right angles to the storage recess 15 or inclined at an angle of 90 degrees from the recess 15. An adjustment screw 19 is screwed into the screw hole 18, and the adjustment screw 19 is a sphere 16 It is screwed so that it can move in the direction of coming and going. A tapered portion 20 is formed at the tip of the adjusting screw 19, and the tapered portion 20 is in contact with a portion of the sphere 16 on the opposite side of the contact portion with the movable pin 17.
[0029]
Here, when the adjusting screw 19 screwed into the screw hole 18 is turned so as to move toward the sphere 16, the tapered portion 20 presses the sphere 16, the sphere 16 presses the movable pin 17, and the movable pin 17 Slides toward the needle receiver 7 side. On the other hand, when the adjusting screw 19 is turned so as to move in a direction away from the spherical body 16, the pressing force acting on the spherical body 16 from the tapered portion 20 decreases. The movable pin 17 under the action of the pressing force slides backward from the needle receiver 7. Thus, the adjusting screw 19 and the sphere 16 function as the position adjusting means 21 for moving the movable pin 17 to an arbitrary sliding position in the storage recess 15.
[0030]
In such a configuration, when the distance between the needle 8 and the needle receiving portion 7 is increased due to the change of the needle 8 to be used from a thick type to a thin type, or for some reason, the needle 8 and the needle receiving portion 7 are not used. When the interval between the two becomes large, adjustment is made to reduce the interval so as to be within an appropriate range.
[0031]
In this adjustment, the driver turns the adjustment screw 19 to move the adjustment screw 19 toward the sphere 16. By this movement, the tapered portion 20 of the adjusting screw 19 presses the outer peripheral surface of the sphere 16, and the pressed sphere 16 moves to the exit side of the storage recess 15 and presses the rear end of the movable pin 17, and the movable pin 17 Slightly slides toward the outlet side of the storage recess 15 (the needle receiving section 7 side).
[0032]
The movable pin 17 slid toward the needle receiver 7 presses the free end of the needle receiver 7, and the pressing causes the needle receiver 7 to bend so as to expand in the outer peripheral direction. And the interval returns to an appropriate state.
[0033]
On the other hand, when the needle 8 to be used is changed from a thin one to a thick one and the distance between the needle 8 and the needle receiver 7 becomes too small and the distance becomes too small, the distance is set to an appropriate range. Make an adjustment to make it larger.
[0034]
In this adjustment, the driver turns the adjustment screw 19 to move the adjustment screw 19 in a direction away from the sphere 16. Due to this movement, the force by which the tapered portion 20 of the adjusting screw 19 presses the outer peripheral surface of the sphere 16 decreases, and the force by which the sphere 16 presses the movable pin 17 toward the needle receiving portion 7 also decreases. For this reason, the movable pin 17 slides in the direction in which the distal end of the movable pin 17 retreats from the needle receiving portion 7 (the direction into the storage recess 15) by the pressing force from the needle receiving portion 7, and the needle toward the outer peripheral direction. The amount of deflection of the receiving portion 7 is reduced, thereby increasing the distance between the needle 8 and the needle receiving portion 7 and returning to the proper state.
[0035]
In this way, according to the present embodiment, the adjustment of the interval between the needle 8 and the needle receiver 7 can be performed accurately, simply, and quickly by turning the adjustment screw 19.
[0036]
Moreover, according to the structure of the present embodiment, the conventionally used needle receiving portion 7 can be used as it is. Also, no significant design change is required for the outer hook 2, and only the storage recess 15 and the screw hole 18 need to be additionally formed. As a new component, the sphere 16, the movable pin 17, and the adjusting screw 19 may be added, and the number of additional components can be reduced to a small number.
[0037]
Further, in the present embodiment, the bottom portion 2a of the outer hook 2 where the screw hole 18 is formed is a portion having the largest thickness compared to other portions of the outer hook 2, and The diameter of the hole 18 can be made large and the adjustment screw 19 having a large diameter can be used, so that the durability of the adjustment screw 19 is improved.
[0038]
Further, in the present embodiment, since the distal end of the movable pin 17 is in contact with the free end of the needle receiver 7, the needle thread 9 that has become poorly hooked on the blade tip 6 can be connected to the needle receiver 7 and the blade 6 at the same time. And winding around the drive shaft 5 can be prevented.
[0039]
Next, a second embodiment of the present invention will be described with reference to FIG. In the present embodiment, the sphere 16 described in the first embodiment is omitted, and the tapered portion 20 at the tip of the adjusting screw 19 is directly in contact with the rear end of the movable pin 17, and the adjusting screw 19 Functions as a position adjusting means for moving the movable pin 17 to an arbitrary sliding position in the storage recess 15.
[0040]
In such a configuration, in the present embodiment, when the adjusting screw 19 is rotated to move the adjusting screw 19 in a direction in which the tapered portion 20 of the adjusting screw 19 comes into contact with or separates from the movable pin 17, the adjusting screw 19 is thereby adjusted. The pressing force acting on the movable pin 17 changes from 19, and the movable pin 17 slides toward the needle receiver 7 or slides backward from the needle receiver 7. As the movable pin 17 slides, the amount of deflection of the needle receiver 7 changes and the distance between the needle 8 and the needle receiver 7 can be adjusted, as in the first embodiment. In addition, by turning the adjusting screw 19, the distance can be adjusted accurately, simply, and quickly. Further, the number of parts can be reduced.
[0041]
【The invention's effect】
According to the horizontal rotary hook of the sewing machine according to the first aspect of the present invention, when the interval between the needle that holds the upper thread and reciprocates vertically and the needle receiving portion of the outer hook deviates from an appropriate range, By operating the position adjusting means, the movable pin is slid, whereby the amount of deflection of the needle receiver with which the movable pin is abutted in the outer peripheral direction can be changed. Adjustment of the interval can be performed accurately, simply, and quickly.
[0042]
According to a second aspect of the present invention, in the horizontal rotary hook of the sewing machine according to the first aspect of the present invention, the position adjusting means is housed in a deep portion of the housing recess and abuts on a rear end of the movable pin. And a tapered portion is formed at the tip, and the tapered portion is brought into contact with a portion of the sphere opposite to a contact portion with the movable pin, and the outer portion is movably moved in a direction of coming into contact with and separating from the sphere. Since it consists of an adjusting screw screwed on the shuttle, by turning the adjusting screw to move the adjusting screw in the direction of coming and going to the sphere, the pressing force acting on the movable pin from the sphere changes, The movable pin slides toward the needle receiving portion or in a direction retracting from the needle receiving portion, whereby the amount of deflection of the needle receiving portion toward the outer peripheral direction can be changed, and the needle and the needle receiving portion can be changed. To accurately, easily and quickly adjust the distance between It can be.
[0043]
According to a third aspect of the present invention, in the horizontal rotary hook of the sewing machine according to the first aspect of the present invention, the position adjusting means has a tapered portion formed at a tip thereof, and the tapered portion is formed at a rear end of the movable pin. Since the adjustment screw is screwed to the outer hook so as to be in contact with and movable toward and away from the movable pin, by turning the adjustment screw, the adjustment screw is brought into contact with the movable pin by the tapered portion. When the movable pin is moved in the separating direction, the pressing force acting on the movable pin from the adjusting screw changes, and the movable pin slides toward the needle receiving section or in the direction of retracting from the needle receiving section. Accordingly, the amount of deflection of the needle receiver in the outer peripheral direction can be changed, and the adjustment of the distance between the needle and the needle receiver can be performed accurately, simply, and quickly.
[0044]
According to the fourth aspect of the present invention, in the horizontal rotary hook of the sewing machine according to the second or third aspect, the adjusting screw is screwed into a screw hole formed on a bottom side of the outer hook. The bottom part of the outer pot where the screw hole is formed is a part where the wall thickness can be formed thicker than other parts of the outer pot, and the diameter of the screw hole can be made larger In addition, it is possible to use a larger diameter adjusting screw, and by using the larger diameter adjusting screw, the durability of the adjusting screw can be increased.
[Brief description of the drawings]
FIG. 1 is a front view showing a horizontal rotary hook according to a first embodiment of the present invention.
FIG. 2 is a plan view thereof.
FIG. 3 is a horizontal sectional view showing a part thereof.
FIG. 4 is a vertical sectional view showing a part thereof.
FIG. 5 is an enlarged sectional view showing an arrangement relationship between a movable pin, a sphere, and an adjustment screw.
FIG. 6 is an enlarged sectional view showing a main part of a second embodiment of the present invention.
FIG. 7 is a front view showing a conventional horizontal rotary hook.
FIG. 8 is a plan view thereof.
FIG. 9 is an explanatory diagram showing a case where the distance between the needle and the needle receiver is within an appropriate range.
FIG. 10 is an explanatory diagram showing a case where the needle and the needle receiver are largely separated from each other.
[Explanation of symbols]
2 Outer hook 3 Inner hook 6 Sword point 7 Needle receiving section 12 Inner hook storage section 15 Storage recess 16 Sphere 17 Movable pin 19 Adjusting screw, position adjusting means 20 Tapered section 21 Position adjusting means

Claims (4)

An outer pot that has an inner pot storage part that stores the inner pot inside and is rotatable around the axis,
A sword point provided on the outer hook,
A needle receiving part formed in an arc shape, one end of which is fixed to the outer hook and the other end of which is a free end;
A storage recess formed in the outer hook and opened to face the free end of the needle receiver;
A movable pin that is slidably housed in the housing recess, and whose tip abuts against the free end of the needle receiver from the front in the bending direction of the needle receiver;
Position adjusting means for moving the movable pin to an arbitrary sliding position in the storage recess,
Horizontal rotary hook of sewing machine having The position adjusting means may include a sphere housed in a deep portion of the housing recess and abutted against a rear end of the movable pin, and a tapered portion formed at a tip, and the tapered portion may be formed by the movable pin of the sphere. 2. The horizontal rotary hook of the sewing machine according to claim 1, further comprising an adjusting screw which is in contact with a portion on the opposite side of the contact portion and is screwed to the outer hook so as to be movable in a direction of coming into contact with and separating from the sphere. The position adjusting means has a tapered portion formed at a front end thereof, the tapered portion is abutted on a rear end portion of the movable pin, and is screwed to the outer hook so as to be movable in a direction of coming and coming from the movable pin. 2. The horizontal rotary hook of the sewing machine according to claim 1, wherein the adjusting screw is an adjusting screw. The horizontal rotary hook of the sewing machine according to claim 2 or 3, wherein the adjusting screw is screwed into a screw hole formed on a bottom side of the outer hook.

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