JP2696836B2 - 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 useful for small household cycle sewing machines.
Can be used. (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-B-44-30179,
Housing and the bed that rises from the other end of the bed housing.
Arm housing that covers one end of the
Operating link mechanism built into the
Extend vertically supported by the tip of the link mechanism and attach the needle to the tip.
With a vertically long needle bar and a drive
And a moving part. Here, the operating link mechanism is created.
The drive unit to be moved is a drive motor, a drive motor and an actuator
It is formed with a main shaft interposed between the frame and the structure. And
When the drive unit is driven with the needle threaded on the needle,
The needle bar reciprocates vertically so that the needle bar
The needle at the end is inserted into the fabric and a seam is formed. (Problems to be solved by the invention) By the way, Japanese Patent Publication No. 44-30179 discloses the above.
Needle bar with a needle at the tip
And reciprocate vertically. Therefore, the needle bar
Considering the vertical reciprocation of the sewing machine, lower the height of the sewing machine.
There were limits to how good it was. Further, it is disclosed in the above-mentioned JP-B-44-30179.
In a sewing machine, the drive motor that constitutes the drive
Although installed in the housing, the main shaft is
The bed housing and arm are installed vertically from inside the bed.
About half of the spindle through the border with the arm housing.
Projecting into the housing. Therefore, the sewing machine
There was a limit to lowering the height of the building. 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.
Unlike the needle bar arm, which is not a vertical reciprocating linear motion,
Reciprocating rocking movement accompanied by arc movement and swinging the needle bar arm
The drive unit to be moved is housed in the bed housing.
is there. That is, the sewing machine according to the present invention includes
It is characterized by the fact that
A bed housing with an insertion hole and a bed housing
Stand up from the other end to cover one end of the bed housing.
And a needle with a needle at the tip
Needle bar arm, and drive motor and the driving force of the drive motor are transmitted to the needle bar arm and the needle
And a drive unit having a transmission system for swinging the stick arm.
The transmission system, together with the drive motor, is located in the bed housing.
It is characterized by being stored. Bed housing and arm housing are housed
It functions as a tag. Bed housing at one end
The part has a needle insertion hole. Bed housing is thin in height
It is desirable to be typed. Arm housing
Bed housing rising from the other end of the bed housing
Cover one end. When holding the needle bar arm swingably,
Arrange the swing shaft horizontally in the housing, and attach the needle to this swing shaft.
It is good to pivot the stick arm. In addition, the axis of the swing shaft and the bed
Is approximately the same height as the needle insertion hole held in the housing.
It is desirable to set to. Almost identical in this way
If the height is set, the needle stopped at the tip of the needle bar arm swings
When rotating, the center of the swinging needle and the axis of the needle insertion hole and the swinging shaft
The line connecting the core almost coincides with the line
Advantageous for vertically inserting the needle into the cloth held on top
It is. Consider inserting the needle vertically into the cloth
And the pivot axis, which is the pivot center of the needle bar arm,
It is desirable to be located far from a certain needle. The needle bar arm
The low rising part pivotally supported by the swing axis and the rising part
It is desirable to form with a pivoted horizontally long arm.
New In this case, attach the needle to the tip of the horizontally long arm.
The distance between the needle and the pivot axis is the length of the horizontally long arm.
The separation can be increased, and the radius of curvature when the needle swings is increased.
And the height of the rising part is low,
This is advantageous for reducing the height of the housing. The drive unit is housed in the bed housing and has a needle bar arm
Swinging with respect to the housing. Drive part
Drive motor held in the bed housing and
Keep it in the bed housing horizontally and parallel to the swing axis.
The main shaft that is held and rotated by the drive motor, the needle bar arm and the main shaft
Main shaft interposed between shaft and held in bed housing
A conversion unit that converts the rotational motion of the needle into a swinging motion of the needle bar arm
Can be configured. A cam mechanism and a switch
A rider link mechanism can be adopted. Arranged in the bed housing parallel to the substantially horizontal main axis
A hook shaft, a hook that is rotated by the hook shaft,
A transmission unit interposed between the shaft and the shaft to transmit the rotation of the main shaft to the shuttle shaft.
It is good to arrange. The transmission unit is a first type attached to the main shaft.
Imming gear and second timing gear attached to hook shaft
Between the first timing gear and the second timing gear
Can be composed of a stretched timing belt and
You. By doing so, the needle bar arm on the side that operates the upper thread,
This is advantageous for improving synchronization with the shuttle. In the bed housing, a top bottle is usually installed next to the needle bar arm.
It is arranged. The top bottle is operated by the main shaft.
The top bottle is connected to the spindle side as shown in the examples below.
Low rising arm that swings by the rotation of the main shaft
And move almost horizontally by the rising arm
Formed with a horizontal arm with a hook for hooking the upper thread at the tip
can do. (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
Up from the other end of the housing 10
Extending in the opposite direction to cover one end of the bed housing 10.
And a housing 11. Above arm housing 11
The top cover 12 is detachably attached to the surface opening
I have. An embroidery frame 13 is attached to the bed housing 10.
ing. The embroidery frame portion 13 is formed by an outer frame 130 and an inner frame 131.
I have. By operating the operating tool 130a, the outer frame 130 and the inner frame 131
Insert the cloth to be embroidered. This embroidery frame part 13 is attached to the moving part 132
The housing built into the motor unit 100 of the housing 1
X-direction motor and Y-direction motor
Move in the X and Y directions. X direction mode
Motor and the Y-direction motor are built in the housing 1.
Driven under the control of a control unit with a CPU as the main component
I do. An embroidery program is stored in the storage element of the control unit.
Stored in the X-direction motor and
The Y-direction motor is driven, and the embroidery frame 13 moves. One end of the bed housing 10 of the housing 1 is
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
I'm done. The needle bar 22 stops in the hole 20b at the tip of the needle bar arm 2.
It is attached by 223. Needle at the lower end of needle bar 22
Stop 23 is attached with needle set screw 230, and
Needle 24 is attached. The rising part of the needle bar arm 2
The height of 21 is such that the needle 24 swinging about the swing shaft 30 is a needle plate.
Perpendicular to or close to 14
So that the height of the needle bar 22 and needle 24 are taken into account.
ing. Push into the hole 20a at the tip of the horizontal arm 20 of the needle bar arm 2.
The rod 25 is inserted. Upper end of presser bar 25 is retaining ring 25
O, O-ring 251 keeps it from falling off. Lower end of presser bar 25
Has a metal presser body 26 with a cloth presser function.
Have been. The guide groove 27 attached to the presser body 26
As shown in FIG. 4, the needle bar arm 2
I have. A spring 29 is provided between the presser body 26 and the needle bar arm 2.
Intervening. On the lower surface of the presser body 26, a ring-shaped
Bullet that enhances the cushioning function and the presser foot function made from the
Sex body 32 is attached. A hole 21a formed below the rising portion 21 of the needle bar arm 2 includes:
The swing shaft 30 is inserted so as to be oriented in the horizontal direction. Swing axis
30 is a bearing 300, a spring 301 and a retaining ring shown in FIG.
Via the 302, as shown in FIG.
Near the recess 10b formed in the bed 101 of the housing 10
It is axially supported by the wall 10a in the horizontal direction. A drive unit for swinging the needle bar arm 2 is shown in FIG.
The housing 1 is provided in a bed housing 10.
In other words, the drive unit supports the support formed in the bed housing 10.
Retained on the motor mounting plate 400, which is fastened to the pillar 10h with the screw 400a
Drive motor 40 and the driving force of drive motor 40
2 as a oscillating power.
The transmission system consists of a large-diameter intermediate pulley 41 for deceleration and an intermediate pulley.
41 and a pulley 40a pressed into the motor shaft of the drive motor 40.
A belt 48 stretched between the belt and the gear 41a of the intermediate pulley 41
The large gear 42 meshes with the large gear 42 as shown in FIG.
A main shaft 43 that rotates integrally, and a pin 44 at an end of the main shaft 43
The top bottle crank 44 fixed at 0, as shown in FIG.
Also has a hole 45a that fits into the cam part 44a of the top bottle crank 44
And a needle bar crank 45. As shown in Figure 5
Further, a spherical bearing 43a is inserted through the main shaft 43. The sphere
The bearing 43a is formed on the bed housing 10 as shown in FIG.
Hold the holder 10h tightened by the mounting part 10e and the screw 10g.
Is held through. Intermediate pulley as shown in FIG.
41 is supported on a support shaft 49. The support shaft 49 is a motor mounting plate 400
Is mounted 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. As shown in FIG.
The bin shaft 63 is held by the bed housing 10. Heaven
6 is pivotally supported so as to swing about the top bin shaft 63.
ing. Here, as shown in FIG.
The hole 44d has a U-shaped part 470 whose tip has a U-shape.
A crank pin 47 is rotatably fitted. Fig. 4
The U-shaped part 470 holds the bushing 64 as shown in
You. At the tip of the horizontally long arm 61 of the top bin 6, an upward
A hook 66 is provided, and two engagement grooves 67 are provided on both sides of the hook 66.
Is provided. As shown in FIG.
A guide just below the top plate 110 of the arm housing 11
The guide member 15 in which the hole 150 is formed is disposed horizontally.
You. Each of the peripheral portion 151 and the hook 66 forming the guide slot 150
The engagement groove 67 is engaged, and the hook 66 is
The engagement groove 67 is guided in a substantially horizontal direction. At this time,
The peripheral edge 151 forming the guide slot 150 is located on both sides of the
This is advantageous for preventing the hook 66 from falling down.
You. The tip of the hook 66 is above the arm housing 11.
It protrudes above the face plate 110. As shown in FIG. 4 and FIG.
The shuttle 7 is disposed below the needle plate 14 in the housing 10.
ing. Hook 7 is fixed to hook shaft 79 with set screw 792.
The shaft 79 is mounted on the housing 1 through a spherical bearing 790.
Disposed horizontally in the jing 10 and parallel to the main shaft 43.
I have. The spherical support 790 is a bed housing as shown in FIG.
Bolt tightened to the mounting part 10i in the ring 10 with the screw 10k
Is held through the default 10L. In FIG. 4, 7
a is a hook retainer fixed with screws 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 latch operating pawl 75 swings around the hole 75a. clutch
The pin 75b of the operating claw 75 is the hole 741 of the rod 740 of the solenoid 74.
It is fitted through 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 into 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,
With the upper thread hooked on the hook 66 of the top bottle 6 and the operation thread,
By operating the switch, the drive motor 40 is driven to rotate. Drive
Belt 48, intermediate pulley 41, large gear by rotation of motor 40
42, the main shaft 43 rotates counterclockwise in FIG. You
Then, as described above, the ceiling eccentric with respect to the spindle 43
Because the cam portion 44a of the crank 44 rotates, the cam portion 44a
The connecting rod part of the needle bar crank rod 45 that is stuck
45b swings up and down. Therefore, connecting rod part 45b
The upright 21 of the needle bar arm 2 connected to the
And as a result, the arrow A shown in FIG.
Reciprocating swinging about the swinging shaft 30 in the direction A and the arrow A '
I do. Therefore, the needle 24 is inserted into the needle insertion hole 140 of the needle plate 4.
The needle insertion hole 140 or the needle insertion hole 140. In this case, the needle
The horizontally long arm portion 20 of the stick arm 2 is long in the horizontal direction, and the swing shaft 30 is a needle 24.
Is far from the needle and the radius of curvature at which the needle 24 swings increases.
That the axis of the swing shaft 30 and the upper surface of the needle plate 14 are substantially the same.
By setting to the height, it swings in the direction of arrow A
The needle 24 is perpendicular or perpendicular to the needle plate 14 near the needle plate 14.
It is in a state close to. Thus the needle 24 is vertical or nearly vertical
In this state, the cloth held in the embroidery frame 13 is inserted through the needle insertion hole 140.
Is done. FIG. 9 shows the upper dead center of the needle bar when the needle bar arm 2 is fully raised.
FIG. 11 shows the state, and the needle bar arm 2 is fully lowered.
Indicates the state at the point. 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 is. 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 is at the top dead center of the needle bar as shown by a solid line in FIG.
From the bushing 64 around the axis 43b of the spindle 43.
When rotated in the direction of the mark C, the inclination angle is formed between the bushing 64 and the hole 6a.
The slide shaft 62 whose degree is regulated is indicated by a two-dot chain line in FIG.
It rises slightly like a female. Therefore, the rising arm 60 is
In the figure, swinging starts in the direction of arrow D '. Therefore heaven
The hook 66 of the bin 6 moves in the direction of the arrow E ', that is, in the return direction.
And approach the top dead center. Heaven bin 6 is dead
FIG. 10 shows the state at the position of the point. Further, from the position of the top dead center of the top bin shown in FIG.
The crank 44 rotates and the bushing 64 moves as shown in FIG.
When it is further rotated in the direction of mark C, it is shown by the two-dot chain line in Fig. 10.
As described above, the inclination angle is restricted by the bushing 64 and the hole 6a.
The slide shaft 62 tilts in a direction to sleep a little more than before. This result
As a result, the rising arm 60 of the sky bottle 6 starts swinging in the direction of arrow D.
The hook 66 starts to move in the direction of arrow E shown in FIG.
You. Therefore, the tension of the upper thread hung on the hook 66 is relaxed.
No. Here, FIG. 10 shows a state immediately before the needle 24 is inserted through the cloth.
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 in FIG. 11, the slide shaft 62 is almost horizontal.
Approach the direction of sleep in a state close to the direction. Therefore, the sky bottle 6
Rising arm 60 swings in the direction of arrow D shown in FIG.
Confuse. Therefore, the hook 66 of the top bottle 6 is further moved to the needle 24 side.
It moves and approaches the state of the bottom dead center of the sky bottle. Fig. 12 shows the sky bottle 6
Shows the state of the bottom dead center of the sky bottle that 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 64 rotates around the main shaft 43 at an angle θ.
1 (see FIG. 12). one
On the other hand, from the state of the bottom dead center of the top bin indicated by the solid line in FIG.
Until the top dead center is reached as shown by the solid line in the figure,
When the return hook 66 returns from the needle 24 to the swing shaft 30
The bushing 64 moves around the main shaft 43 by the angle θ2.
All you need to do is rotate. Here, θ1> θ2 (see FIG. 12)
). Therefore, hook 66 returns quickly and is short
Back in time. (Effect) In the above-described embodiment, the needle bar arm 2 is pivoted about the swing shaft 30.
Is configured to swing with respect to the bed housing 10.
The conventional vertical bar-shaped needle bar reciprocates vertically.
The height of the entire sewing machine can be reduced compared to
it can. Especially, the length of the horizontal arm portion 20 of the needle bar arm 2 is long.
And the distance from the axis of the swing shaft 30, which is the swing center, to the needle 24.
So that the needle 24 faces the needle insertion hole 140
The radius of curvature when swinging can be increased, and the needle 24
It is advantageous to insert the needle vertically into the needle insertion hole 140. In this embodiment described above, the main shaft is arranged vertically.
Compared with the sewing machine disclosed in JP-B-44-30179, the main shaft 43, swing
Drive units such as shaft 30, top bin shaft 63 and shuttle shaft 79 are installed horizontally.
And placed inside the bed housing 10 that is thinner in the height direction.
Drive motor 40, intermediate pulley 41, large gear
42, needle bar crank rod 45, sky bottle crank 44, and more
Is a bed in which the drive unit such as the hook shaft 79 is thinned in the height direction.
Since it is arranged in the housing 10, the height of the entire housing 1
Is advantageous for lowering As described above, the swing shaft 30, the main shaft 43, the drive motor 40, the intermediate
Drive units such as the pulley 41 and the large gear 42 are arranged in the bed 101.
Because high strength, strict dimensional accuracy is required,
Only bed 101, arm housing 11 is high strength
Degree, strict dimensional accuracy is not required, aluminum die casting
And higher costs, such as steel and cast iron
Large amounts of material need not be used for the arm housing 11.
The arm housing 11 can be made of synthetic resin and is lightweight
This is advantageous for cost reduction and cost reduction. [Effect of the Invention] In the sewing machine according to the present invention, the needle bar arm is connected to the bed housing.
The needle bar has a vertical bar shape.
Compared to a conventional sewing machine that reciprocates in the
The height of the whole thin can be reduced,
Suitable for In the sewing machine according to the present invention, the needle bar arm is swung.
Motor and transmission system constituting a driving unit for the bed
Because it was stored in the housing, the upper part of the bed housing
This is simpler and more advantageous for lowering the height.
You. In this regard, the vertically extending main shaft that constitutes the drive unit is
From the bed housing to the arm housing
What is the sewing machine disclosed in Japanese Patent Publication No. 44-30179
different.

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, 14 is a needle plate, 140 is a needle insertion hole, 2 is a needle bar arm, 20 is a horizontally long arm portion, 21 is a rising portion, 22 is a needle bar, 24 is a needle, 30 is a swing shaft, 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, 63
Indicates a top bottle axis, and 66 indicates a hook.

Claims (1)

(57) [Claims] A housing having a bed housing having a needle insertion hole at one end thereof, an arm housing rising from the other end of the bed housing and covering the one end of the bed housing; a tip which is swingably housed in the arm housing; A drive unit including a needle bar arm having a needle, a drive motor, and a transmission system for transmitting the driving force of the drive motor to the needle bar arm and swinging the needle bar arm. The sewing machine is housed in the bed housing together with the drive motor. 2. The needle bar arm is pivotally supported by a swing shaft held substantially horizontally in the bed housing, and the transmission system of the drive unit is housed in the bed housing substantially horizontally and parallel to the swing shaft. A main shaft which is rotated by the drive motor, and which is housed in the bed housing, is interposed between the needle bar arm and the main shaft, is held in the bed housing, and rotates the main shaft to swing the needle bar arm. 2. The sewing machine according to claim 1, further comprising a conversion unit that converts the motion into motion.