JP3793980B2 - Sewing thread spool device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a thread spool pin device for a sewing machine that can be switched between a storage position and a use position, and in particular, the axis of a spool pin is directed to a thread guide formed on an arm portion at the use position, It is related with what let the upper thread | yarn pay out smoothly.
[0002]
[Prior art]
Conventionally, in a sewing machine provided with a sewing machine cover that covers an arm part, a pocket part between a bed part and an arm part, etc., a thread stand device for removably attaching a thread spool for supplying an upper thread to a sewing needle is provided with a sewing machine cover. It is configured to be switchable between a storage position that does not interfere with the sewing machine cover when the sewing machine is installed, and a use position where the upper thread can be fed out linearly from the yarn spool to the thread guide formed on the arm portion when using the sewing machine.
[0003]
Furthermore, the thread spool device is widely used practically by sliding the upper thread toward the axial end of the thread spool without rotating the thread spool, and the thread spool rotates with inertia. This prevents the upper thread from being loosened, and is suitable for avoiding the upper thread from being wound around the spool pin and from causing unevenness in the seam.
[0004]
For example, as shown in FIGS. 6 to 8, the thread stand device 100 of the sewing machine M1 includes a pivot shaft 102 that is rotatably supported by an arm portion 101, and a thread that has one end fixed to the pivot shaft 102. The stand bar base 103 has a thread stand stick 104 fixed to the other end of the thread stand base 103. The pivot shafts 102 and the shaft centers 102a and 104a (104b) of the spool pin 104 are parallel and directed in the left-right direction, and by rotating the spool stand 103 and the spool pin 104 around the shaft center 102a, It is possible to switch between a storage position where the yarn piece 105 is stored in the storage portion 106 provided in the arm 101 and a use position where the yarn piece 105 is moved to the outside of the storage portion 106.
[0005]
The upper thread 111 extending from the thread spool 105 is guided by a thread guide 110 formed at the upper end of the arm 101 and guided to the inside of the arm 101. Although not shown, the thread 111 passes through a thread tension plate and a balance. Supplied to the sewing needle. When the thread spool device 100 is switched to the storage position, the thread spool 105, the thread spool base 103, and the thread spool 104 are stored in the storage section 106, and the sewing machine cover 108 can be attached. Since the storage unit 106 can be stored in a horizontal posture, the storage unit 106 can be formed on the arm unit 101 as small as possible, which is very advantageous when the sewing machine M1 is downsized.
[0006]
On the other hand, in the spool stand device disclosed in Japanese Utility Model Publication No. 3-28874, the storage position in which the spool is stored in the pocket between the bed portion and the arm portion, and the spool is moved backward from the storage position and rotated. It is configured to be switchable over the use position moved to the rear side of the pedestal column. A vertical pin is connected to the spool pin base to which the spool pin is fixed, and this pin is slidable in the front-rear direction and turned to a bracket fixed to the side surface facing the pocket of the pedestal. It is supported movably.
[0007]
[Problems to be solved by the invention]
In the thread spool device 100, since the pivot shaft 102 and the shaft centers 102a and 104a of the thread spool 104 are parallel to the left and right, respectively, the thread spool 104 is moved to the arm portion 101 when switched to the use position. The direction of the shaft center 104b of the spool pin 104 that protrudes rearward and faces in the left-right direction is greatly deviated from the thread guide 110. Accordingly, there is a problem that the upper thread 111 is not smoothly drawn out from the sewing thread piece 105, causing unevenness in the stitches, or depending on the type of thread, the thread breaks during sewing.
[0008]
On the other hand, in the thread stand device disclosed in Japanese Utility Model Publication No. 3-28874, the distance between the thread spool and the thread guide becomes long, and the upper thread is easily loosened between the thread spool during sewing and the thread guide. Moreover, it is very troublesome to switch between the storage position and the use position by sliding and rotating the spool pin base back and forth, and in addition, the structure that supports the spool stand so as to be slidable and rotatable. There are many members, which is disadvantageous in production cost.
[0009]
SUMMARY OF THE INVENTION An object of the present invention is to provide a thread spool pin device for a sewing machine that can be switched between a storage position in which a yarn piece is stored in a storage portion of an arm portion and a use position in which the yarn piece is moved to the outside of the storage portion. The structure is such that the shaft center of the vertical bar is directed to the thread guide, the storage part recessed in the arm part is made small, the switching between the storage position and the use position is simplified, and the like.
[0010]
[Means for Solving the Problems]
The thread spool pin device of the sewing machine according to claim 1 is switchable between a storage position in which the yarn piece is stored in a storage portion recessed in the arm portion of the sewing machine and a use position in which the yarn piece is moved to the outside of the storage portion. In a thread spool device of a sewing machine, a pivot shaft rotatably supported by the arm portion, a thread spool rod base having one end fixed to the pivot shaft, and the other end portion of the thread spool rod base and a fixed yarn spool pin, when the use position, the axis of the spool pin is a group with directing the thread guide for guiding the needle thread from and thread spool is formed on the arm portion at the distal end It is configured to be inclined so as to be separated from both the horizontal direction and the vertical direction from the storage portion on the end side, and the shaft center of the spool pin is horizontally oriented in the horizontal direction when in the storage position, and the shaft of the pivot shaft The thread guide side is higher than the virtual axis centered horizontally in the left-right direction Sea urchin has been inclined at a predetermined angle in the vertical plane, and configured to perform a switching operation of the storage and use positions only the pivot shaft the spool pin stand rotation operation around the Is.
[0011]
In the thread spool device of this sewing machine, the spool position and the spool position can be easily switched between the storage position and the use position by rotating the thread stand and the spool pin about the axis of the pivot shaft. When the sewing machine is not used, the sewing machine can be switched to the storage position, the thread spool, the spool pin base and the spool pin can be stored in the storage portion, and a sewing machine cover covering the arm portion and the like can be attached. When the sewing machine is used, when it is switched to the use position, the shaft center of the spool pin is directed to the yarn guide on the distal end side, and is inclined in the horizontal direction and the vertical direction from the housing portion on the proximal end side. because it is configured, the upper thread is fed out smoothly from the thread spools during sewing.
When in the stowed position, the axis of the spool pin is oriented horizontally in the left-right direction, and the horizontal spool can be stowed in the stowage, so that the stowage can be made as small as possible, and the size of the thin can be reduced. Will be very advantageous. Since the axis of the pivot shaft is tilted at a predetermined angle in the vertical plane so that the yarn guide side is higher than the virtual axis, the spool pin whose axis is horizontally oriented in the horizontal direction at the storage position is provided. By rotating around the axis of the pivot shaft via the spool pin base, the axis of the spool pin can be directed to the yarn guide at the tip side at the use position.
[0012]
According to a second aspect of the present invention, the storage portion is formed at the rear end portion of the upper end portion of the arm portion, and the thread spool is located behind the arm portion when in the use position. It protrudes to the side. Therefore, the storage position and the use position can be switched very simply by rotating the thread stand base and the thread stand around the axis of the pivot shaft. Further, since the distance from the yarn spool to the yarn guide at the storage position is short, it is possible to prevent the slack of the upper yarn from occurring between the yarn spool and the yarn guide as much as possible. Other effects similar to those of the first aspect are achieved.
[0013]
[0014]
[0015]
Sewing spool pin apparatus of claim 3 is the invention of claim 1, is characterized in that said predetermined angle is approximately 10 degrees. For example, if the lever length of the spool stand is about 32 mm, the distance between the pivot shaft and the base end of the spool pin at the storage position is about 18 mm, and the vertical distance is about 22 mm, By tilting the pivot shaft about 10 degrees in the vertical plane so that the yarn guide side is higher than the virtual axis, the spool stand with the axis centered horizontally in the horizontal direction at the storage position is pivoted. By rotating around the axis, the axis of the spool pin can be directed to the yarn guide at the use position. Other effects similar to those of the first aspect are achieved.
[0016]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described below with reference to the drawings. This embodiment is an example when the present invention is applied to a thread spool device provided in a small household sewing machine. In the following description, the front side is defined as the front, the left-right direction, and the left-right direction with reference to the operator who operates the sewing machine.
[0017]
1 is a rear view of the sewing machine M, FIG. 2 is a right side view of the sewing machine M, and FIG. 3 is a plan view of the sewing machine M. The sewing machine M includes a bed portion 1, a leg column portion 2 erected from the right end portion of the bed portion 1, an arm portion 3 that extends to the left from the upper end of the leg column portion 2 so as to face the bed portion 1, A sewing machine cover 5 that can cover the arm portion 3, the bed portion 2, the pocket 4 of the arm portion 3, and the like is provided. A free bed portion 6, commonly called a free arm, is formed on the left end side portion of the bed portion 1. By inserting the free bed portion 6 into a cylinder such as a hem, the cylinder can be easily sewn. It has become.
[0018]
Although not shown, the bed 1 includes a feed dog vertical movement mechanism for moving the feed dog up and down, a feed dog forward and backward movement mechanism for moving back and forth, a bobbin bobbin, and a thread catcher (horizontal) that cooperates with the sewing needle. The arm 3 is provided with a needle bar drive mechanism for moving the needle bar with a sewing needle attached to the lower end thereof, and a needle bar swing mechanism for swinging the needle bar in a direction perpendicular to the cloth feed direction. A balance driving mechanism that moves the balance up and down in synchronization with the vertical movement of the needle bar, a thread tension mechanism that adjustably applies tension to the upper thread that is supplied from the thread spool 8 to the sewing needle through the balance. .
[0019]
The rear end portion of the upper end portion of the arm portion 3 is provided with a storage portion 7 capable of storing the yarn piece 8 with the upper portion and the rear portion thereof being opened, and the yarn piece 8 is detachable. And a storage position indicated by a chain line in which the yarn spool 8 is stored in the storage portion 7 and a use position indicated by a solid line in which the yarn spool 8 is moved to the outside of the storage portion 7 and protrudes to the rear side of the arm portion 3. A switchable thread spool device 10 is provided.
[0020]
The thread spool device 10 will be described.
The thread stand device 10 includes a pivot shaft 11 rotatably supported by the arm portion 3, a thread stand rod base 12 having one end fixed to the pivot shaft 11, and the other end of the thread stand rod base 12. It is composed of a spool pin 13 and the like fixed to the portion.
[0021]
The proximal end portions of the pivot shaft 11 and the thread stand base 12 are fitted into a groove 3b formed at the rear right end of the horizontal portion constituting the storage portion 7 of the outer frame 3a of the arm portion 3, and are pivotally supported. The shaft 11 passes through the outer frame 3a and extends into the inside thereof, and is rotatably supported inside the outer frame 3a. The axis 11a of the pivot shaft 11 is inclined by a predetermined angle θ (about 10 degrees) in the vertical plane so that the left side is higher than the virtual axis 15 that is horizontally oriented in the left-right direction. Further, at the storage position, the thread stand base 12 is fixed to the pivot shaft 11 so as to be in the posture shown by a chain line in FIG. 2, and at the storage position, the thread stand 13 has its axis 13a. Is fixed to the thread stand base 12 so as to be horizontally oriented in the left-right direction.
[0022]
Here, as shown in FIG. 2, for example, the lever length c of the thread stand base 12 is about 32 mm, and the length in the front-rear direction between the pivot shaft 11 and the base end portion of the thread stand 13 at the storage position. a is about 18 mm, and the vertical length b is about 22 mm. When the spool stand 12 in the storage position is rotated by a predetermined angle α (about 85 degrees) clockwise in FIG. The shaft center 13 b of the spool pin 13 is directed to the yarn guide 20. In this state, the base end portion of the thread stand base 12 contacts the outer frame 3a .
[0023]
Next, the operation of the spool pin 13 in switching between the storage position and the use position will be described with reference to FIGS. As shown in FIG. 4, the proximal end of the spool pin 13 at the storage position is A, the distal end is B, the proximal end of the spool pin 13 at the use position is C, and the distal end is D. The rotation center of the base end portion of the standing bar 13 is E, the rotation center of the distal end portion is F, the line segment AB is the axis 13a of the spool pin 13 at the storage position, and the line segment CD is the use position. A line segment EF indicates the axis 11 a of the pivot shaft 11.
[0024]
FIG. 5 shows the relationship between the line segments AB, CD, and EF: a state D1 viewed from the back, a state D2 viewed from the plan view, a state D3 viewed from the right side, and a state D4 viewed from the extended line of the line segment CD. For the purpose of illustration, the yarn guides 20 formed on the arm portion 3 are shown in association with each other. The line segment AB is inclined horizontally by the predetermined angle θ in the vertical plane so that the left side is higher than the virtual axis 15 which is horizontally oriented horizontally and the line segment CD is horizontally oriented horizontally. When the predetermined angle α is rotated about the minute EF, a line segment CD is formed. The line segment CD, that is, the shaft center 13b of the spool pin 13 at the use position points toward the thread guide 20.
[0025]
The operation and effect of the thread stand device 10 will be described.
When the thread stand base 12 and the thread stand 13 are rotated around the axis 11a of the pivot shaft 11, the storage position and the use position can be easily switched. When the sewing machine M is not used, By switching to the storage position, the thread spool 8 and the thread spool bar base 12 and the thread spool bar 13 can be stored in the storage portion 7 and the sewing machine cover 5 can be mounted. When the sewing machine M is used, it is switched to the use position. Then, since the shaft center 13a of the thread stand 13 is directed to the thread guide 20, the upper thread 9 is smoothly unwound from the thread spool 8 during sewing. Therefore, it is possible to prevent the occurrence of unevenness in the stitches and the breakage of the upper thread as much as possible.
[0026]
Further, the storage portion 7 is formed at the rear end portion of the upper end portion of the arm portion 3, and the yarn spool 8 protrudes to the rear side of the arm portion 3 when in the use position, so that the switching between the storage position and the use position is performed. Since the distance from the thread piece 8 to the thread guide 20 at the use position is also short, it is possible to prevent the upper thread 9 from loosening between the thread piece 8 and the thread guide 20 during sewing as much as possible.
[0027]
Since the shaft center 13a of the spool pin 13 is configured to be horizontally directed in the left-right direction when in the storage position, the yarn spool 8 can be stored in the storage portion 7 in a horizontal posture, so that the storage portion 7 is formed as small as possible. This is very advantageous in reducing the size of the sewing machine M. In addition, since the axis 11a of the pivot shaft 11 is tilted by a predetermined angle θ in the vertical plane so that the left side is higher than the virtual axis 15, the spool pin 13 is horizontally oriented horizontally in the storage position. Is rotated around the axis 11a of the pivot shaft 11, so that the axis 13a of the spool pin 13 can be directed to the yarn guide 20 at the use position.
[0028]
In the case of this embodiment, the lever length c of the thread stand base 12 is about 32 mm, the front-rear distance a between the pivot shaft 11 and the base end of the thread stand 13 at the storage position is about 18 mm, and the vertical distance b. Is about 22 mm, and the axis 11a of the pivot shaft 11 is tilted about 10 degrees in the vertical plane so that the left side is higher than the virtual axis 15, so that the axis 13a is directed rightward at the storage position. By rotating the thread spool 13 around the axis 11a of the pivot shaft 11, the axis b of the thread spool 13 can be directed to the thread guide 20 at the use position.
[0029]
Note that the angle θ of the axis of the pivot shaft 11 that is inclined in the vertical plane so that the left side is higher than the virtual axis 15 is not limited to 10 degrees as in this embodiment, but the shape of the sewing machine M. An appropriate angle is set according to the relative relationship and shape of the thread spool bar 12 and the thread spool bar 13 fixed, a rotation angle for rotating the thread spool bar 12, and the shaft center 13a in the horizontal direction at the storage position. By rotating the spool pin 13 facing toward the axis, the shaft center 13a of the spool pin 13 can be directed to the yarn guide 20 at the use position.
[0030]
【The invention's effect】
According to the thread spool device of the first aspect, the storage position and the use position can be easily switched, and when the storage position is switched, the spool, the spool pin base and the spool pin are stored in the storage portion. When the sewing machine cover can be mounted and switched to the use position, the shaft center of the spool pin is formed on the arm portion on the distal end side and directs the yarn guide for guiding the upper thread from the yarn spool and the proximal end Since it is configured to be inclined in the horizontal direction and the vertical direction away from the storage portion on the side, the upper thread can be smoothly drawn out from the thread spool during sewing, causing unevenness in the stitches, Depending on the type of thread, it is possible to prevent the thread from being cut during sewing as much as possible.
The shaft center of the spool pin is oriented horizontally in the left-right direction when in the stowed position, and the axis of the pivot shaft is vertical so that the yarn guide side is higher than the virtual axis oriented horizontally in the left-right direction. Since the thread spool in a horizontal posture can be stored in the storage section, the storage section can be formed as small as possible, which is very advantageous for downsizing the sewing machine, and the storage position. Rotate the spool pin with its axis centered horizontally to the left and right around the axis of the pivot shaft via the spool pin stand, so that the tip end of the axis of the spool pin is threaded at the use position. It is possible to direct to the guidance. In addition, the switching operation between the storage position and the use position can be performed only by the rotation operation of the thread stand base around the pivot shaft.
[0031]
According to the thread spool pin device of the sewing machine of claim 2, the same effect as that of claim 1 is obtained, but the storage part is formed at the rear end part of the upper end part of the arm part, and the spool is in the use position. Projecting to the rear side of the arm, it is very easy to switch between the storage position and the use position, and the distance from the thread spool to the thread guide at the storage position is also short. The slack of the upper thread can be prevented as much as possible.
[0032]
[0033]
According to the thread spool device of the sewing machine of claim 3 , the same effect as in claim 1 is obtained, but the predetermined angle is about 10 degrees, for example, the lever length of the thread spool base is about 32 mm, When the distance between the virtual axis and the spool pin at the retracted position is about 18 mm and the vertical distance is about 22 mm, the axis of the pivot axis is horizontally oriented horizontally. By tilting about 10 degrees in the vertical plane so that the thread guide side is higher than the thread guide side, the thread stand base with its axis centered horizontally in the storage position is rotated around the axis of the pivot shaft. By doing so, the axis of the spool pin can be directed to the yarn guide at the use position.
[Brief description of the drawings]
FIG. 1 is a rear view of a sewing machine provided with a thread stand device according to an embodiment of the present invention.
FIG. 2 is a right side view of the sewing machine of FIG.
FIG. 3 is a plan view of the sewing machine of FIG. 1;
4 is an enlarged view of a main part of the sewing machine of FIG. 1. FIG.
FIG. 5 is an explanatory view for explaining the operation of the spool pin device.
FIG. 6 is a rear view of a sewing machine provided with a spool pin device according to the prior art.
7 is a plan view of the sewing machine of FIG. 6. FIG.
FIG. 8 is a partial right side view of the sewing machine of FIG. 6;
[Explanation of symbols]
M sewing machine 3 arm part 7 storage part 8 thread spool 10 thread stand device 11 pivot shaft 12 thread stand base 13 thread stand 15 virtual axis 20 thread guide 11a, 13a, 13b axis

Claims (3)

In a thread spool pin device of a sewing machine that can be switched between a storage position in which a yarn piece is stored in a storage portion recessed in an arm portion of the sewing machine and a use position in which the yarn piece is moved outside the storage portion,
A pivot shaft rotatably supported by the arm portion, a thread spool bar having one end fixed to the pivot shaft, and a thread spool bar fixed to the other end of the thread spool base; With
When in the use position, the shaft center of the spool pin is formed on the arm portion on the distal end side and directs the yarn guide for guiding the upper thread from the yarn spool, and in the horizontal direction and vertically from the accommodating portion on the proximal end side. It is configured to be inclined so as to be separated in both directions,
The shaft center of the spool pin is horizontally oriented in the horizontal direction when in the retracted position, and the axis of the pivot shaft is in a vertical plane so that the thread guide side is higher than the virtual axis oriented horizontally in the horizontal direction. At a predetermined angle,
The switching operation between the storage position and the use position is configured so that it can be performed only by the rotation operation of the spool stand with the pivot shaft as the center,
Sewing thread spool device characterized by that.   The sewing machine thread stand according to claim 1, wherein the storage portion is formed at a rear end portion of the upper end portion of the arm portion, and the thread spool projects to the rear side of the arm portion when in the use position. Bar equipment.   The thread spooler of a sewing machine according to claim 1, wherein the predetermined angle is about 10 degrees.

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