JP2696837B2 - sewing machine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Purpose of the Invention] (Industrial application field) The present invention provides an improved miniature device that can be made as low as possible.
Shin. The present invention is applicable to a small household sewing machine.
Can be. (Prior art) Conventionally, downsizing has been required for sewing machines, especially for household sewing machines.
Have been. A typical example of a downsized sewing machine is the public
As disclosed in JP-A-44-30179,
And a swinging operating link mechanism built into the housing
And a vertical extension pivotally supported by the tip of the operating link mechanism.
A vertically long needle bar with a needle at the tip and an operating link mechanism
And a driving unit to be moved. Here, the driving unit is driven while the needle thread is passed through the needle.
The operating link mechanism swings, but the needle bar
Reciprocates vertically, causing the needle at the tip of the needle bar to move
It is inserted into the fabric and seams are formed. (Problems to be Solved by the Invention) By the way, in the above-described sewing machine, a needle bar having a needle at the tip is used.
Is a vertically long rod-like structure that reciprocates vertically. So
Therefore, considering the vertical reciprocation of the needle bar,
Even if the jig is miniaturized, the needle bar that reciprocates vertically
The top end passes through the hole in the housing and from the top of the housing
Protrude. Therefore, there is a limit to reducing the height of the sewing machine.
Was. The present invention has been made in view of the above circumstances, and
The aim is to provide a sewing machine that is advantageous for lowering the height
is there. [Structure of the Invention] (Means for Solving the Problems) The sewing machine according to the present invention is different from a conventional operating link mechanism.
Differently, a needle bar arm is provided, the needle bar arm is pivotally supported
Move the rod arm with circular motion, not vertical reciprocating linear motion.
The reciprocating rocking motion is performed. That is, the sewing machine according to the present invention has a housing having a needle insertion hole.
And a needle that has a needle at the tip and is swingably held in the housing
A rod arm and a drive unit for swinging the needle bar arm with respect to the housing.
The housing is horizontal to hold the needle bar arm swingably.
With a pivot axis disposed along the top of the needle insertion hole.
The feature is that the cross section of the swing axis is defined on the long line
Is what you do. When holding the needle bar arm swingably,
The swing shaft is arranged horizontally, and the needle bar shaft is
Pivoting is preferred. To the axis of the swing shaft and the housing
Approximately the same as the upper surface of the needle plate with the retained needle insertion hole
It is desirable to set to height. Almost like this
With the same height, the needle stopped at the tip of the needle bar arm swings
Of the swinging needle and the upper surface of the needle plate
The line connecting the axis of the moving shaft and the shaft
Insert the needle vertically into the cloth held on top of the
It is advantageous for Insert the needle vertically into the cloth
Considering that, the pivot axis that is the pivot center of the needle bar arm is
It is desirable to be at a position far from the needle at the tip of the camera. needle
The stick arm has a low rising part pivotally supported by the swing axis,
It is formed of a horizontally long arm that is pivotally supported on the uphill.
Is desirable. In this case, attach the needle to the tip of the horizontally long arm.
So that the length of the horizontal arm, the needle and the pivot axis
The distance between the needles can be increased, and the radius of curvature when the needle swings
It is advantageous to increase the size and the height of the rising portion is low.
This is advantageous for reducing the height of the housing. The song
When using a needle that has been constructed,
Needles can be placed on the cloth even if it is not
Can be inserted vertically. The drive unit swings the needle bar arm with respect to the housing.
And the drive motor held in the housing, almost
The motor is installed horizontally and parallel to the swing axis.
The main spindle is rotated between the main spindle and the needle bar arm.
And the conversion unit that converts the rotational movement of the needle into the swinging movement of the needle bar arm
Can be configured. The conversion mechanism includes a cam mechanism and a switch.
A rider crank mechanism can be adopted. Generally, the housing is rotated by a hook shaft and a hook shaft.
The hook to be rotated is interposed between the hook shaft and the spindle, and the rotation of the spindle is
A transmission unit for transmitting to the shuttle shaft is provided. Driving force transmission to hook shaft
Consider lowering the height of the housing
And the hook shaft is arranged in parallel with the substantially horizontal main shaft.
Is desirable. The transmission unit is the first timing attached to the main shaft.
Gear, a second timing gear attached to the shuttle shaft,
Stretched between the first timing gear and the second timing gear
Timing belt. This
The needle bar arm on the side that operates the upper thread and the shuttle
This is advantageous for improving synchronization. A needle bin is usually placed next to the needle bar arm.
You. The top bottle is operated by the main shaft. The heaven bin is described later
As shown in the embodiment, the rotation of the main shaft is
To a rising arm with a low swinging height and a rising arm
For hooking the upper thread on the tip that is pivoted and moves almost horizontally
And a horizontally long arm having a hook.
In this case, a guide engaging portion is formed on both sides of the hook,
Two guides extending substantially horizontally in the housing
Position the hook between the hooks, and engage the engaging parts on both sides of the hook.
It is desirable to engage each guide strip and guide it in a substantially horizontal direction.
Good. In this way, the hook of the sky bottle is almost horizontal
Reciprocating in the direction, lower the height of the housing
Is advantageous. (Function) Set the needle thread on the needle and set the cloth under the needle.
When the drive unit is driven with the needle bar arm, the needle bar arm swings,
The needle at the tip of the needle bar arm does not
With the accompanying rocking movement, it is inserted into the cloth and the seam is formed.
It is. (Example) Hereinafter, an example of a sewing machine according to the present invention will be described with reference to the drawings.
This will be described with reference to FIG. The sewing machine according to the present embodiment is a small household
This is the case when applied to icle sewing machine. For each component below
Will be described with reference to the drawings. Fig. 1 is a perspective view of the entire sewing machine.
FIG. 2 is an exploded perspective view of a main part of the sewing machine, and FIG.
4 is a bottom view of the sewing machine with the cover removed, and FIG.
FIG. 5 is a cross-sectional view taken along the line IV-IV in FIG. 5, and FIG. 5 is a line VV in FIG.
FIG. 6 is a sectional view taken along the line VI-VI in FIG.
FIG. 7 is a plan view with the top cover removed, and FIG.
FIG. 8 is a sectional view taken along line VIII-VIII in FIG. (Configuration) The housing 1 will be mainly described with reference to FIG.
You. The housing 1 forms a lower part as shown in FIG.
Bed housing 10 that is thinned in the height direction
Rises upward from the end of the pad housing 10 and further laterally
An extended arm housing 11 and an arm housing 11
With the top cover 12 detachably attached to the top opening of the
Consists of Embroidery frame 13 is attached to bed housing 10
Have been. The embroidery frame part 13 is formed by an outer frame 130 and an inner frame 131.
Have been. By operating the operating tool 130a, the outer frame 130 and the inner frame 131
Then, sandwich the cloth to be embroidered. The embroidery frame 13 is
Attached to the motor unit 100 of the housing 1.
X-direction motor and Y-direction motor
Data in the X and Y directions. X direction module
Motor and the Y-direction motor are built into the housing 1.
Drive controlled by a control unit whose main component is the CPU
Move the embroidery frame 13 to the appropriate X-direction position and Y-direction position.
Adjust to The embroidery program is stored in the storage element of the control unit.
Ram is stored and the X-direction motor is
Then, the embroidery unit 13 is moved by driving the Y-direction motor. The top of the bed housing 10 of the housing 1
The needle insertion hole 140 is located below the tip of the
A needle plate 14 is attached. The Y motor
Is shown as a Y motor 16 in FIG. Referring mainly to FIGS. 2, 4 and 5, the needle bar arm 2
Will be described. The needle bar arm 2 becomes narrower toward the tip.
Horizontal arm 20 that extends diagonally in the horizontal direction
Formed with a wide, low-height riser 21 that is integral with the
Have been. The needle bar 22 is stopped in the hole 20b at the tip of the needle bar arm 2.
It is attached by a screw 223. At the lower end of the needle bar 22,
Needle stopper 23 is attached with needle stopper screw 230,
A needle 24 for sewing is attached. Needle bar arm 2 rising
The height of the portion 21 is determined by the needle 24 that swings around the swing shaft 30.
Perpendicular to or perpendicular to board 14
The needle bar 22 and needle 24, etc.
Have been. Into the hole 20a at the tip of the horizontally long arm 20 of the needle bar arm 2.
A presser bar 25 is inserted so as to protrude freely. On presser bar 25
The ends are retained by retaining rings 250 and O-rings 251. Push
At the lower end of the rod 25, a metal presser body 26 having a cloth presser function is provided.
Is attached. The gas attached to the presser body 26
As shown in FIG. 4, the guide rod 28 of the iron rod arm 2 is
Has been inserted. There is a gap between the presser body 26 and the needle bar arm 2.
A pulling 29 is interposed. On the lower surface of the presser body 26,
Buffer function and presser foot made of ring-shaped rubber
An elastic body 32 that enhances performance is attached. A hole 21a formed below the rising portion 21 of the needle bar arm 2 includes:
The swing shaft 30 is inserted in the horizontal direction. The swing shaft 30 is the second
Through bearing 300, spring 301 and retaining ring 302 shown in the figure
Then, as shown in FIG.
Wall 10a near the depression 10b formed in the bed 101 of the ring 10
Is supported in the horizontal direction. A drive unit for swinging the needle bar arm 2 is shown in FIG.
Post 10 formed in bed housing 10 of housing 1
h is held by the motor mounting plate 400 tightened with the screw 400a.
Drive motor 40, a large-diameter intermediate pulley 41 for deceleration,
The pulley press-fitted to the pulley 41 and the motor shaft of the drive motor 40
Of the intermediate pulley 41 and the belt 48
The large gear 42 meshing with the gear 41a and the large gear 42 as shown in FIG.
A main shaft 43 that rotates integrally with the gear 42, and an end of the main shaft 43
The top bin crank 44 fixed with the pin 440 to the
As shown, it fits with the cam part 44a of the top bottle crank 44
It is formed by a needle bar crank rod 45 having a hole 45a. No.
As shown in FIG. 5, a spherical bearing 43a is inserted through the main shaft 43.
ing. The spherical bearing 43a is a bed as shown in FIG.
Fastened with the mounting part 10e of the housing 10 and the screw 10g
It is held via a holder 10h. It is shown in Fig. 3.
Thus, the intermediate pulley 41 is supported by the support shaft 49. The support shaft 49 is
It is mounted on the mounting plate 400 via a retaining ring 49a. As shown in FIG.
Hole 45c of the needle portion 45b and the hole 21b of the rising portion 21 of the needle bar arm 2.
The shaft 46 is held via a retaining ring 46a. here
Therefore, as is apparent from FIG.
a is eccentric with respect to the axis of the main shaft 43. Therefore, the Lord
When the shaft 43 rotates, the eccentric cam portion 44a rotates
Therefore, the connecting rod part 45b of the needle bar crank rod 45 is
Reciprocating rocking motion in the direction. As a result, the needle bar arm 2 rises
The part 21 reciprocates up and down, so that the needle bar arm 2 swings
Arrow A direction and A 'direction shown in FIG.
Swings back and forth. As shown in FIG. 2, loosen the upper thread beside the needle bar arm 2.
A ceiling bin 6 for squeezing and straining is provided. Heaven
6 is pivoted by a low rising arm 60 and a pin 60a.
And the horizontally long arm 61 formed. Heavenly bottle 6 Yes
Operates with a slider link mechanism. That is, heaven bottle
A hole 6a formed at the lower end of the rising arm 60 of FIG.
A shaft 62 is attached. Slide shaft 62
The bushing 64 made of powder alloy that functions as a slider
The bushing 64 is the axis of the slide shaft 62
It is sandwiched between bushing holders 65 on both sides in the direction. As shown in FIG. 4, the rising arm 60 of the top bin 6
The pivot hole 60a formed near the hole 6a is inserted through a bearing 60b.
The top bin shaft 63 is inserted. Top bottle 6 has top bottle axis 63
It is pivoted to swing as a center. Where
As shown in FIG. 2, the hole 44b of the top bottle crank 44 has a tip
The crank pin 47 has a U-shaped part 470
It is fitted so that it can rotate freely. U-shape as shown in FIG.
The part 470 clamps the bushing 64. Sky bottle 6
At the tip of the arm 61, an upward hook 66 is provided,
Two engagement grooves 67 are provided on both sides of the hook 66.
As shown in FIG.
Immediately below the upper surface plate 110, a guide having a guide slot 150 formed therein is formed.
The guide member 15 is disposed horizontally. Guide slot 150
The respective peripheral grooves 151 and the engaging grooves 67 of the hook 66 are engaged,
The engagement groove 67 of the hook 66 is almost horizontal along the guide slot 150
You will be guided in the direction. At this time, a guide
Since the peripheral portion 151 forming the slot 150 is located,
This is advantageous for preventing the hook 66 from falling down. The hook 66
Is above the upper surface plate 110 of the arm housing 11.
It protrudes. As shown in FIG. 4 and FIG.
The shuttle 7 is disposed below the needle plate 14 in the housing 10.
I have. The shuttle 7 is fixed to the shuttle 79 by a set screw 792.
9 is a bed housing of the housing 1 via a spherical bearing 790
Are arranged in the horizontal direction and parallel to the main shaft 43 in the
You. The spherical bearing 790 is a bed housing as shown in FIG.
Holder fastened to the mounting part 10i in the
It is held through da 10L. In FIG. 4, 7a
Is a hook retainer fixed with a screw 7b. As shown in FIG. 6, a small timing gear 78 is
Mounted via set screw 780. On the other hand, FIG.
As shown in FIG. 5 and FIG.
70, one-way clutch 71 composed of leaf spring, ring
72, large timing gear 73 is attached. Great Thailand
The mining gear 73 has a main shaft through a shaft 731 and a set screw 73a.
It is connected to 43 and interlocks with the main shaft 43. One wake on slit 700 of clutch operating ring 70
The projection 710 of the latch 71 is engaged. One way crack
The protruding piece 711 of the hook 71 is engaged with the slit 730 of the large timing gear 73.
I agree. As shown in FIG. 2 and FIG.
A solenoid 74 and a clutch operating claw 75 are provided adjacent to 70.
The support shaft 49 is inserted into the hole 75a of the clutch operating claw 75,
The switch operating claw 75 swings around the hole 75a. Crack
The pin 75b of the operating claw 75 is the hole 74 of the rod 740 of the solenoid 74.
It is fitted in 1 via a retaining ring 742. Clutch operation
The claw 75 is urged by a spring 76,
The clutch operating pawl 75 rotates around the hole 75a, and the pawl 751
When trying to press the claw 701 of the clutch operating ring 70,
Suctioned through rod 740 by solenoid 74
As a result, the engagement of the clutch operating ring 70 with the pawl 701 is released.
I have. Therefore, the one-way clutch 71
The main shaft 43 is activated via a one-way clutch 71
And the large timing gear 73 are connected. Therefore, large gear
When the main shaft 43 rotates by rotating the large timing gear 73
Rotates in conjunction with. Then, a timing bell with teeth
77 rotates, the small timing gear 76 rotates, and the hook shaft 77,
The shuttle 7 rotates. In the present embodiment, the large timing gear 73
The number of teeth is set to twice the number of teeth of the small timing gear 78.
You. Therefore, when the large timing gear 73 makes one rotation, it becomes smaller.
The timing gear 78 makes two rotations. That is, the spindle 43 is operated once
When the needle bar arm 2 reciprocates once, the shuttle 7 rotates twice.
It consists of The end 76a of the spring 76 is
It is locked in the locking hole 823 of the racket 80. When you want to stop the rotation of the shuttle 7 for the end of sewing, etc.
The control unit operates the solenoid 74. Therefore b
The pad 740 moves forward, and the clutch operating pawl 75 moves around the hole 75a.
And the pawl 751 engages with the pawl 701 of the clutch operating ring 70
Is done. Therefore, the one-way clutch 71 operates in the opening direction.
The main gear 43 and the large timing gear
73 does not rotate. Therefore, the large timing gear 73 stops,
The timing belt 77 does not operate, and the rotation of the shuttle 7 is stopped.
You. The solenoid 74 is a bed housing as shown in FIG.
The motor housing held on the support 10h formed on the housing 10
The mounting plate 400 is inserted into the bed housing 10 via screws 743.
It is attached. As shown in FIG. 2 and FIG.
A bracket 80 is attached above the. Braquet
The fixing portion 8 is formed of a metal plate and has a fixing hole 810.
1 and a holding section that rotatably supports the tension pulley 820
82, a deforming portion 83 located between the holding portion 82 and the fixing portion 81,
It is formed with. In order to facilitate deformation,
A slit 830 is formed, and the holding portion 82 is
Is bent into a U-shaped cross section to have a reinforcing rib effect.
ing. A protruding piece 821 is formed on the holding portion 82,
A screw hole 822 having a female thread is formed. As shown in FIG.
Bracket 80, set screw 810a into fixing hole 810
Insert and fix to the lower surface of bed 101 of bed housing 10
Have been. Here, an adjusting screw 84 having a male screw is
It is screwed into one screw hole 822. The tip of the adjusting screw 84 is
Abutment arranged on the lower surface of bed 101 of bed housing 10
It is in contact with the part 10c. Therefore, operate the adjusting screw 84
The screw hole 822 screwed into the adjusting screw 84.
Due to the deformation of the shape part 83, it is displaced vertically and the bracket 80
Holding part 82 and tension pulley 820
And the tension of the timing belt 77 is adjusted. I
Therefore, the timing belt 77 can be prevented from loosening, and
Between the needle thread and the needle bar arm 2, that is, between the upper thread and the lower thread
It is advantageous for securing. As shown in FIGS. 2 and 5, the main shaft 43 has
A detection plate 85 consisting of a large circle and a small circle is attached.
The handwheel 86, which is manually operated by the user, has a set screw
Installed by 861. Rotation of detection plate 85
The rotation of the shaft 43 is detected by the photo interrupter 850.
The photo interrupter 850 is built in the bed housing 10.
Function as a visual sensor. In addition, handwheel
86 has a problem with embroidery work, such as thread entanglement.
When the drive motor 40 is stopped, the handwheel 86
Is manually turned by the operator to rotate the spindle 43, thereby
Also for correcting the positions of the shuttle 7, needle bar arm 2, and top bin 6.
It is. The bearing 860 has a bed as shown in FIG.
Screw 10f to the mounting part 10d of the housing 10
It is held via the holder 10h. (Operation) Now, the operation of the sewing machine according to the above-described embodiment will be described.
Will be explained. First, while setting the cloth on the embroidery frame part 13,
Operate with the upper thread hooked on the hook 66 of the top bottle 6
By operating the switch, the drive motor 40 is driven to rotate. Yo
The belt 48 and the intermediate pulley are rotated by the rotation of the drive motor 40.
41, the large gear 42 and the main shaft 43 rotate counterclockwise in FIG.
Turn over. Then, as described above, the eccentricity is
Because the cam part 44a of the top bottle crank 44 that rotates
Of the needle bar crank rod 45 that is stuck in the cam part 44a
The connecting rod portion 45b swings up and down. Therefore,
Of the needle bar arm 2 connected to the rod portion 45b by the shaft 46
The bar 21 moves up and down, and as a result, the fourth bar
Center the swing shaft 30 in the directions of the arrows A and A 'shown in the figure.
Swings back and forth as a heart. Therefore, the needle 24 is inserted into the needle plate 14
The needle is inserted into the through hole 140 or comes off the needle insertion hole 140.
You. In this case, the horizontally long arm portion 20 of the needle bar arm 2 is long in the lateral direction.
The pivot axis 30 is located far from the needle 24 and the needle 24
When the radius of curvature is large, the center of the swing shaft 30 and the needle plate 14
Because the surface and the surface are set at almost the same height,
The needle 24 that has swung in the direction of the mark A is positioned near the needle plate 14 near the needle plate 14.
In a vertical or nearly vertical state. Therefore needle 24 is vertical
Or a cloth or needle held in the embroidery frame 13
It is inserted through the insertion hole 140. Fig. 9 shows the needle bar arm 2 rising
11 shows the state of the top dead center, and FIG.
This shows the state at the bottom dead center. As the main shaft 43 rotates,
The needle bar arm 2 swings in the order of FIG. 9, FIG. 10, FIG. 11, and FIG.
It works. In this embodiment, when the main shaft 43 rotates, the one-way
The large timing gear 73 rotates via the switch 71,
Hook 7 via Gubelt 77, small timing gear 78, and hook shaft 79
Rotates in synchronization with the swing of the needle bar arm 2, that is, the needle bar arm 2
When the shuttle 7 makes one reciprocation, the shuttle 7 rotates twice, and the needle 24 pierces the needle plate 14 above.
Penetrate the cloth held by the embroidery frame 13 and insert the needle insertion hole 140
When passing, the upper thread hung on the needle 24
The lower thread is hooked and sewn on the cloth of the embroidery frame 13 with the upper thread and the lower thread
Eyes are formed. In this case, the embroidery frame 13 is
Moved by the X-direction motor and Y-direction motor controlled by the control unit.
The embroidery is formed on the cloth. Next, the operation of the top bin 6 will be described. When main shaft 43 is opposite
When rotated in the measuring direction,
The retained bushing 64 moves counterclockwise,
Rotate around the axis of the spindle 43 in the direction of arrow C shown in the figure.
I do. At this time, the crank pin 47 is the hole of the top bottle crank 44
Because it turns to 44b, the U-shaped part 470 and the bushing 64
Change direction. As described above, the bushing 64 is in the direction of arrow C.
When rotated, the bushing held in the U-shaped part 470
While sliding the slide shaft 62, the length of the slide shaft 62
Repeat the reciprocating slide along the direction. At this time, FIG.
As shown in the figure, the base end 62b of the slide shaft 62 is restricted by the hole 6a.
Therefore, as the bushing 64 rotates in the direction of arrow C,
As shown in FIGS. 9 to 12, the inclination angle of the slide shaft 62
Fluctuates. Such variation in the inclination angle of the slide shaft 62
The rise of the top bin 6 to which the slide shaft 62 is fixed
The arm 60 swings back and forth in the directions of arrow D and arrow D '.
I do. On the other hand, the engaging groove 67 of the hook 66 is
Is guided by the slot 150 and reciprocates almost horizontally.
The horizontal arm 61 of the top bottle 6 is in the horizontal direction,
And reciprocate in the direction of arrow E '. Needle bar arm 2 at top dead center
The bushing 64 has an arrow about the axis 43b of the spindle 43.
When rotated in the C direction, the inclination angle between the bushing 64 and the hole 6a
The slide shaft 62 whose is regulated is indicated by a two-dot chain line in FIG.
It rises slightly. Therefore, the rising arm 60 is shown in FIG.
Starts swinging in the direction of arrow D '. Therefore
The hook 66 of the button 6 moves in the direction of the arrow E ', that is, the return direction.
And approach the top dead center. Top dead center position where heaven bin 6 has returned
FIG. 10 shows the state of the position. Further, from the position of the top dead center of the top bottle 6 shown in FIG.
The top bin crank 44 rotates and the bushing 64 is shown in FIG.
When it is further rotated in the direction of arrow C, a two-dot chain line
Like the female bushing, the inclination angle is restricted by the bushing 64 and the hole 6a.
The slide shaft 62 tilts slightly in the direction of sleeping than before. This
As a result, the rising arm 60 of the top bin 6 swings in the direction of arrow D.
The hook 66 starts moving in the direction of arrow E shown in FIG.
Confuse. Therefore, the tension of the upper thread hung on the hook 66 is relaxed.
No. Here, FIG. 10 shows a state immediately before the cloth is inserted through the needle 24.
Immediately before the needle 24 is inserted through the cloth, tension of the upper thread
The tension of the upper thread to prevent cutting due to
Need to loosen. Therefore, as described above, the hook 66
Move in the direction of arrow E to remove the upper thread
It loosens. In FIG. 11, the bushing 64 has further rotated in the direction of arrow C.
The state is indicated by a solid line. In FIG. 11, the footage is greater than in FIG.
The hook 66 is further moved to the needle 24 side to loosen the upper thread. Eleventh
The top bin crank 44 is turned further from the state shown by the solid line in the figure.
And the bushing 64 rotates in the direction of arrow C shown in FIG.
Then, as shown by the two-dot chain line in FIG.
Approaching to sleep in a state that is almost horizontal. Therefore
The rising arm 60 of the top bin 6 is in the direction of arrow D shown in FIG.
Advance rocking. Therefore, hook 66 of top bottle 6 is a needle
Move further to the 24 side and approach the state of the bottom dead center of the sky bottle. Fig. 12
Indicates the state of the bottom dead center of the top bin 6 where the top bin 6 has advanced. By the way, the above-mentioned top bottle 6 has a quick return mechanism.
You. That is, is the state of top dead center of the top bottle indicated by the solid line in FIG.
11 through the state shown by the solid line and the two-dot chain line in FIG.
Until the state of the bottom dead center shown by the solid line in Fig. 12 is reached,
In other words, when the hook 66 is going toward the needle 24, the twelfth
As shown in the figure, the bushing 63 rotates around the main shaft 43 at an angle θ.
You have to rotate one equivalent. On the other hand, FIG.
From the state of the bottom dead center of the top bottle shown by the line, it is shown by the solid line in FIG.
Until the top bottle reaches the top dead center, that is, the hook 66
When returning from the needle 24 side to the swing shaft 30 side, the bushing
Is just rotated around the main shaft 43 by the angle θ2.
Is enough. Here, the relationship is θ1> θ2. Therefore
The hook 66 returns quickly and returns in a short time. (Effect) In the above-described embodiment, the needle bar arm 2 is pivoted about the swing shaft 30.
Is vertically swung with respect to the housing 1.
Conventional sewing machine with vertical needle bar reciprocating movement
, The height of the entire sewing machine can be reduced.
As can be understood from FIG. 4, the extension of the upper surface of the needle insertion hole 140
The cross section of the swing shaft 30 of the needle bar arm 2 is defined on the long line.
You. In particular, the needle plate 1 having the axis of the swing shaft 30 and the needle insertion hole 140
4 (that is, on the extension of the upper surface of the needle insertion hole 140)
Are defined at substantially the same height. Therefore, needle insertion
Needle bar perpendicular or nearly perpendicular to the cloth over hole 140
It is advantageous to pierce the needle 24 of the arm 2 and improves sewing accuracy
You. Particularly, since the length of the horizontally long arm portion 20 of the needle bar arm 2 is long,
Increase the distance from the axis of the swing shaft 30, which is the center of movement, to the needle 24.
The needle 24 swings toward the needle insertion hole 140
The radius of curvature can be increased when the needle 24 is inserted
This is advantageous for insertion perpendicular to the hole 140. In the above-described embodiment, the needle bar arm 2 is swung as described above.
Because it is configured to swing around the shaft 30, a vertical bar-shaped needle
Compared to the conventional sewing machine in which the rod reciprocates vertically
In addition, it is advantageous to shorten the needle bar 22, and the inertial mass of the needle bar 22 is
Becomes smaller, and the needle bar arm 2 swings at a high speed.
This is also advantageous for reducing the vibration and noise of the sewing machine. Therefore Mi
This is advantageous for high-speed operation of Shin. In addition, the needle bar 22 is fixed to the swinging needle bar arm 2,
Different from Japanese Patent Publication No. 44-30179, a complicated operating link mechanism
It is not necessary to hold the needle bar via the. In addition, the swing unit 30, the main shaft 43, the drive motor 40, the intermediate pulley 4
1, large gear 42, top bin shaft 63, needle bar crank rod 45, top
Drive units such as bin crank 44 and hook shaft 79
Since it was arranged in the bed housing 10 thinned in the direction,
This is advantageous for reducing the overall height of the housing 1. Further
The main shaft 43, the swing shaft 30, and the shuttle shaft 79 are mounted inside the bed housing 10.
The bed is laid out horizontally and arranged in parallel.
Thinning the height of the housing 10 and thus the housing 1
This is advantageous for reducing the overall height. As described above, the swing shaft 30, the main shaft 43, the drive motor 40, the intermediate
Drive units such as pulley 41 and large gear 42 are installed on bed 101
Therefore, high strength and strict dimensional accuracy are required
Arm 101 is high strength,
Strict dimensional accuracy is not required, and aluminum die casting and casting
The higher cost and weight
Certain materials do not have to be used for the arm housing 11;
The housing 11 can be made of synthetic resin,
It is advantageous for to down. [Effect of the Invention] In the sewing machine according to the present invention, the needle bar arm is attached to the housing.
The vertical needle bar moves vertically.
Compared to the conventional sewing machine that reciprocates
The height of the body can be reduced, making it a small household sewing machine.
Suitable. The needle bar arm swings on an extension of the top of the needle insertion hole.
Since the cross section of the shaft is specified, the cloth on the needle insertion hole
To pierce the needle of the needle bar arm vertically or nearly vertically
And sewing accuracy is ensured. In the sewing machine according to the present invention, in particular, the needle bar arm
When formed with a horizontally long arm and a low rising part
, The height of the sewing machine is low because the length of the horizontal arm is long.
The distance from the swing center to the needle can be increased while
Therefore, the needle faces the cloth while lowering the height of the housing.
The radius of curvature when swinging can be increased,
This is advantageous for perpendicular insertion through the cloth.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 shows an embodiment of the present invention. FIG. 1 is a perspective view of the entire sewing machine, FIG. 2 is an exploded perspective view of main parts, and FIG. FIG. 4 is a bottom view of the sewing machine, and FIG.
FIG. 5 is a sectional view taken along the line VV in FIG. 3, FIG. 6 is a sectional view taken along the line VI-VI in FIG. 3, and FIG. FIG. 8 is a sectional view taken along the line VIII-VIII of FIG. 3, FIG. 9 is a side view showing a needle bar arm top dead center, and FIG. 10 is a side view showing a top bottle top dead center. , Eleventh
The figure is a side view showing the bottom dead center of the needle bar arm, and FIG. 12 is a side view showing the bottom dead center of the top bin. In the figure, 1 is a housing, 10 is a bed housing, 11 is an arm housing, 12 is a top cover, 14 is a needle plate, 140 is a needle insertion hole, 15 is a guide member, 2 is a needle bar arm, 20 is a horizontally long arm, 21 is a rising part, 22 is a needle bar, 24 is a needle, 25 is a presser bar,
26 is the presser body, 26 is the presser body, 30 is the pivot axis, 32 is the elastic body,
40 is a drive motor, 43 is a main shaft, 44 is a top bottle crank, 45 is a needle bar crank rod, 6 is a top bottle, 62 is a slide shaft, 63
Is a top bottle shaft, 64 is a bushing, 66 is a hook, 67 is an engagement groove, 7 is a hook, 79 is a hook shaft, 80 is a bracket, 81 is a fixing portion,
82 is a holding part, 820 is a tension pulley, 83 is a deformation part, 830
Indicates a slit, and 84 indicates an adjusting screw.

Claims (1)

(57) [Claims] A housing having a needle insertion hole, a needle bar arm having a needle at a distal end thereof and swingably held by the housing, and a drive unit for swinging the needle bar arm with respect to the housing. Has a swing shaft arranged along the horizontal direction for holding the needle bar arm swingably, and a cross section of the swing shaft is defined on an extension of the upper surface of the needle insertion hole. A sewing machine characterized in that: 2. 2. The sewing machine according to claim 1, wherein the axis of the swing shaft and the upper surface of the needle plate having the needle insertion hole held in the housing are set at substantially the same height. 3. The drive unit includes a drive motor held by the housing,
A spindle disposed substantially horizontally and in parallel with the pivot axis and rotated by the drive motor, interposed between the needle bar arm and the spindle, and rotating the spindle with the pivot motion of the needle bar arm; 2. The sewing machine according to claim 1, further comprising a conversion unit configured to convert the data into a data. 4. The housing includes a shuttle shaft arranged in a substantially horizontal direction parallel to the main shaft, a shuttle rotated by the shuttle shaft, and a rotary shaft interposed between the shuttle shaft and the main shaft to rotate the main shaft to the shuttle shaft. A transmission unit for transmitting the first timing gear attached to the main shaft, a second timing gear attached to the shuttle shaft, the first timing gear and the second timing gear; 4. The sewing machine according to claim 3, further comprising a timing belt stretched therebetween.