JPS5825195A - Yarn cutter of sewing machine - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The invention in the technical field relates to a thread cutting device for cutting sewing thread in a sewing machine by cooperation of a fixed blade and a movable blade.

Purpose of the Invention The eye blade of this invention is capable of establishing motion transmission to a movable blade, hm
An object of the present invention is to provide a thread cutting pupil which can be machine-cut only at a predetermined phase in the operating cycle of a sewing machine, and which can reliably prevent operational errors and damage to the device.

EXAMPLE An example embodying the present invention will be described below with reference to the drawings. As shown in FIGS. 1 and 2, one support plate 16 is fixed on the sewing machine bed 11 above the upper plate 12 of the sewing machine bed 11. The support plate 1
A hook stopper plate 14 is fixed to the front of the upper surface of the hook 3, and the inner hook stopper 14LL at the tip thereof is connected to the inner hook stopper fitting portion i5a of the inner hook 15.
Fits in! are doing.

As shown in FIGS. 1 and 3, one fixed blade 17 is fixed on the upper surface of the blade stand 16 fixed on the support plate 16, and the tip thereof is a cutting edge 17a.

On the support plate 13, a movable blade 19 is rotatably supported at its base end by an illumination member 118, and its distal end and
The thread catching part 19b, its blade surface i9a and the thread (1* are connected to the grip part 1
The thread inserts 5t9c and 4 located between the thread inserts 9a and 9a are shaped like Ja. Then, the movable blade 19 moves from the solid line position in FIG.
By rotating to the dot-dashed line position, the sharp-pointed tip enters the needle thread guide, and by simultaneously returning from the two-dot chain line position to the solid line position, the fabric side limb of the needle thread And the bobbin thread is caught in the curved thread catching part 19b and the thread introduction groove 19C
After the thread is introduced into the thread, the upper thread and lower thread are cut by the cooperation of the blade curve 19a of the opening 11 and the tip end 17a of the fixed blade 17. In addition, the cutting edge 17 of the fixed blade 17
The contact pressure between a and the blade surface 19a of the oJ moving blade 19 is adjusted based on the movement of the screw 20 and lock nut 21, as is clear from FIG.

As shown in FIGS. 1, 2 and 6, the support plate 16
-L is provided with an actuating disk 26 as an actuating member rotatably supported by a vertical lllllj 122, and one triangular notch 25a is formed on its outer periphery. A connecting link 24 is interposed between the upper surface of the operating disk 26 and the lower surface of the moving blade 19 near the proximal end, and when the operating disk 26 rotates once in the direction of the arrow, this connecting link 24
The blade 19 is rotated one reciprocating motion via Lr'JH4)).

As shown in FIGS. 1, 2 and 5, the movable blade 19
A locking lever 25 serving as a locking member is rotatably supported at its base end, and a triangular locking lever 25 that can be engaged with the notch 23 +1 & is provided in the middle of the lever 25 as a locking member. Along with the claw 25a being formed, a release pin 25b whose lower part is obliquely protrudes downwardly at the intermediate portion as well, as shown in FIG. The spring 26 serves to bias the locking lever 25 in the direction in which the locking pawl 25a thereof locks into the notch 23=. As shown in FIG. 1, the locking claw 25& of the locking lever 25 is connected to the notch 2. lSa
When the actuating disk 26 is locked, rotation of the actuating disk 26 is prevented.
The actuating disk 26 is then held in a predetermined angular position. With this, +1! The connection point between the connecting link 24 and the operating disc 26, or the center of the shaft 22, which is the rotation center of the operating disc 26, and l, which is the rotation center of the DJ blade 19.
The movable blade 19 is located at the solid line position, located slightly on the same side as the arrow P from the line XX connecting the center of 1118.

As shown in FIGS. 2 and 6, the F of the support plate 16 is
An auxiliary frame 61 is fixed therebetween, and a shaft 22 that supports the actuating disk 26 is inserted and supported in a hole 62 formed in the auxiliary frame 61. A driven gear 66, which is larger than a bevel gear, is supported on the ll1122. Also, Figures 2 and 4
As is clear from the figure, a pair of notches 33a protruding from the driven gear 66 are fitted @26b formed on the actuating disk 26.
The operating disc 26 and the driven gear 66 are engaged with each other.
It is designed to rotate to Htrt.

As shown in FIGS. 4 and 8, a drive gear 65 is fixed to the tip of a feed cam drive shaft 64 that is connected to a lid (not shown) and rotates in conjunction with the drive mechanism of the sewing machine. ing.

As shown in FIG. 2, Section 4, FIG. 5, FIG. A support 1liI66 extending in the rightward direction is rotatably supported and movable in the axial direction.
is fixed. The intermediate gear body 67 is
The first gear 68, which is a fan-shaped bevel gear with an angle of approximately 120 degrees and meshes with the B garden wheel 66, always meshes with the drive wJ gear 65, and has a face width that is more than twice that of the drive Iv1m wheel 65. So F! 8. The second gear 69 is formed at the center of the periphery of the second gear 69. (: The primary part 40 is formed.

As shown in FIG. 9, when the main shaft of the sewing machine and the feed cam drive shaft 64 are located at a position corresponding to the lowest point of the needle, and the second gear 69 is located at a predetermined rotation angle, Part IJ part 40 during meshing of drive gear 65
The intermediate gear part body 67 and the support I
IIJ66 is allowed to move in the axial direction, and at other times, the meshing teeth of the drive gear 35 and the partition wall 40 face each other, preventing the intermediate gear body 57 and the support shaft 66 from moving in the axial direction. be done.

As described above, the opening part of the partition wall part 40 and the driving gear 6
When the intermediate gear body 67 is moved to the left side as shown in FIG. At the same time, as shown in FIG. 7, the shoulder portion 38a of the first gear 68 is located within the engagement range with the lower end slanted surface of the regulation release pin 25b. In this state, when the first gear 68 is rotated in the direction of arrow Q in FIG. 5, the shoulder portion 38a of the first gear 68 engages with the release pin 25b, and is up to the 2-point pole position of the 7th cause (gIw
After the locking pawl 25a is disengaged from the notch 23a of the fl = moving circle 26, the first gear 68 is covered! 1! ! ]
When engaged with the wheel 66, the actuating disk 26 is rotated once in the direction of arrow P in FIG. Therefore, the interlocking means for rotating the IIE drive disk 26 based on the operation of the drive mechanism of the sewing machine is constituted by the F5u drive @ gear 65, the intermediate gear body 67, the driven gear 66, etc. Also, the first gear 68 and the release pin 25b allow the locking lever 25 and the actuating disc 2 to be locked.
Dissociation control means for controlling dissociation with 6 is configured.

Further, as shown in FIG. 4, when the intermediate product body 67 is moved to the right side, the first gear 68 is separated from the position of the driven gear 66 and the release pin 25b.

As shown in Figures 2 and 5,
At the left end, there is a collar 41 having an annular recess 4ta on the outer periphery.
is fixed.

As shown in FIGS. 2, 4, 6, and 7, [
(bracket fixed to auxiliary frame 6-1) 4
2 K has a multi-connection lever 44 rotatably supported at its intermediate portion by 1lIII 43, and a bottle 44& protruding from one end is connected to the annular four portions 41a of the collar 41 described in nII.
As the connecting lever 44 is rotated to the left or right, the fitting between the pin 44a and the collar 41 moves the support 11ll166 to the left or right. Color 45 on item 1 4i11143
A spring 46 is wound around and attached to the pin 44a to apply a spring force to the pin 44a. The gear 6B is the driven gear 6
The 1st tb gear body 67 is biased in one direction so that the 1st tb gear body 67 is disentangled from the 3rd stage.

Another bottle 44bK protruding from the other end of the connecting lever 44
A linking rod 47 is connected thereto as linking means.

The linking rod 47 is pulled to the right in FIGS. 4 and 7 by a thread cutting signal based on the operation of a separately provided operating means, and the linking lever 44 is rotated as shown in FIG.
The intermediate gear body 67 resists the biasing force of the spring 46.
is moved to the left.

Next, the operation of the sewing machine sewing machine constructed as described above will be explained. Now, during normal continuous sewing rotation, as shown in FIG.
The support shaft 66 and the intermediate gear body 67 are located on the right side through the 1! lI! With the neck length J1, the first gear 6B has retreated from the engagement range with the target wheel 63 and the engagement position with the release pin 25b. Further, as shown in FIG.
The locking pawl 25a of the locking lever 25 is engaged with the notch 26a of the locking lever 25, and the operating disc 26 is locked at a fixed rotational position. Therefore, the connection point between the actuating disk 26 and the connection link 24 is located slightly further away from the line X-X on the force direction side V (arrow I), and the movable blade 19 is placed in the most retracted position, and the direction 19a is It is located below the fixed blade 17.

Therefore, even if the sewing machine is driven in this state, the feed cam drive ll1lllI64 is rotated, and the intermediate gear body 67 is rotated in the direction of arrow Q in FIG. 5 via the drive gear 65, the first gear 38 and Since there is a gap between the driven gear 66 and the driven gear 66, its rotational operation is not transmitted to the movable blade 19, and the I
J] The moving blade 19 maintains the locked state shown in FIG.

It is assumed that the required sewing for the processed Φ is completed and the sewing machine is stopped at the lower position of the needle, as shown in FIG. In this case, the meshing part of the drive gear 65 and the open part of the partition wall part 40 of the second gear 69 face each other, and the '111i1
The gear body 67 is now allowed to move to the left. Thereafter, when an operation is performed to output a thread trimming signal 8', the output signal causes the linking rod 47 at the position shown in FIG. 4 to be pulled to the right.

Therefore, the support shaft 66 is moved to the left through the rotation of the connection lever 44, and the intermediate gear body 67 is disposed on the left J side.

In this way, when the intermediate gear body 67 is positioned to the left, the first gear 68 is moved to the driven gear 66 as shown in FIG.
As shown in FIG. 5, the shoulder portion 68a of the first gear 68 faces between the slanted lower ends of the release pins 25b of the engagement 1h lever 25.

In this state, the sewing machine main shaft is further rotated. As a result, when the feed cam drive shaft 64 is rotated in the direction of the drag arrow R, the shoulder portion 68B of the first gear 38 first hits the lower end of the release pin 25b, as shown in FIG. It engages with the slanted surface and locks with the 7th double dot line /]<-25 rotates and the locking pawl 25a
is removed from the notch 26a of the actuating disk 26, and the actuating disk 2
The comment/tsuku for 6 is canceled. Next, the first gear 5
8 meshes with Hadouen Shin 6'5 and covers it! IEII gear 66 is 1! ! The actuating disk 26 is rotated in the direction of arrow P. Therefore, as is clear from FIG. 9, in the process of the sewing machine needle rising from the top surface of the needle plate, the OJ moving blade 19 rotates from the solid line position in FIG. 1 to the two-dot chain line position via the connecting link 24. Move the needle thread at the tip! After the sewing machine needle enters the center of the needle, it moves to the circle and back, and the thread on the fabric side of the upper thread and the thread are captured, and the sewing machine needle shifts to the lower direction, and the blade surface of the rotating force 19 is released before it gets lost in the upper part of the throat plate. 19LL and fixed blade 1
The upper thread' and the upper thread are cut between the cutting edge 17a of the thread 7 and the cutting edge 17a.

In this case, when the wound blade 19 starts rotating, the connection point between the connecting link 24 and the operating disk 23 is located at a position slightly away from the X-X line, so the rotation force 19 is The dynamic linkage is initially slow and gradually becomes faster, and when the X-X rays break down, the amount of rotational force is changed, the speed becomes slow again, and after becoming fast again, it is stopped. The movable pick blade 19 is suddenly retracted after capturing the upper thread and the lower thread, and the cutting is performed in the rapidly moving state, so that the cutting can be performed reliably.

In this way, the sewing machine main shaft and feed cam drive-u3
When 4 rotates 240 degrees from the needle's lowest point position, the engagement between the first gear 68 and the driven gear 66 is completed and the operating disc 2
When one rotation of the shaft B is completed and the rotating force 19 returns to the position shown in the solid line in FIG. gear 35
# of the intermediate gear body 67 faces again.
Movement in the MJj direction is now permitted. For this reason,
Due to the spring force of the spring 46 on the 1i lever 44, the linking rod 47 moves back to the pressure, and the intermediate gear body 67 moves back to the right horn together with the support shaft 66.
The condition shown in the fourth cause will occur.

This completes the operation for one cutting.

As described above, in this thread cutting device, only the opening part of the partition part 40 and the driving tooth 765 are
- in the first gear of the intermediate gear body 67 is opposite to
The movement to the line force is allowed and the movement can be transmitted to the wound blade 19, otherwise 1ljl HQV
@When the wall part 40 and the drive gear 65 are engaged (4), the switching operation to the red sea bream transmission state is not possible.
gt; VC. Therefore, it is possible to prevent mistakes in operation 1' and damage to the thread cutting device, etc. that may result from such mistakes.

In addition, if the sewing machine is configured so that the thread take-up lever always stops at the highest point when the thread is stopped, the thread trimming operation will re-drive the sewing machine and the sewing machine will be reset after the needle reaches the highest point. , +j-1 The same operation as described above is performed. In addition, in the Fufu example, it is set to be allowed at the lowest point of the needle in the direction of transfer to the III direction of the intermediate gear body 67; 〇Effects of the Invention As exemplified in the embodiments, this invention achieves reciprocating interlocking of the rotational force by the rotation of the actuating member. irrentially and rotatable integrally with its body; a drive gear that rotates in conjunction with the sewing machine's drive mechanism; and a drive gear located in the darkness of those gears, the first and an intermediate gear body having a second gear;
! a partition wall portion that allows movement in the direction of the driven gear; and a spring means for biasing the first gear of the intermediate gear body in the direction in which the first gear is transferred from the driven gear; By providing two stages [linkage for meshing with gears],
nJ The interlock transmission to the moving blade is established and interrupted only at a predetermined phase in the sewing machine's operating cycle w4dh
FJ is superior to J, reducing operational errors and equipment damage.
It boosts the lagging effects that can be stopped.

[Brief explanation of the drawing]

Section 1 shows a thicker embodiment of the thread cutting device embodying the present invention. 3 is a sectional view showing the fixed blade and the movable blade along line 1-1 in FIG. 1, and FIG. 4 is a sectional view taken along line 1-1 in FIG.
- A sectional view taken along the line B, Fig. 5 is a sectional view taken along the V-V line in Fig. 2, and Fig. 6
The figure is a sectional view taken along the line Vl-Vl of Figure 4 of the plane, Figure 7 is a cross-sectional view equivalent to Figure 4 at the time of thread cutting and shutting, Figure 8 is a perspective view showing the drive gear and intermediate rotation front body, and Figure 9 is 5 is a time chart showing the operation of the thread cutting device. Sewing machine bed 11, fixed blade 17, movable blade 19, operating disc 23, driven gear 66, drive gear 35, support shaft 66, internal gear body 67, first gear 68, second gear 69, partition wall part 40, spring 46, linking rod 47° Patent applicant: Brother Industries, Ltd.

Claims (1)

[Claims] A movable blade (19) for cutting the sewing thread in cooperation with the blade (17), and a rotatable operating member (1) for reciprocating the movable blade (19). 26), a driven gear (66) that is rotatable integrally with the working body (26), and a drive gear (65) that rotates in conjunction with the drive mechanism of the sewing machine.
The driven gear (66) is located between the driving gear (65) and the driven gear (66), and is equipped with an OT function to rotate around the axis and move along the axis. a first gear (68) that can mesh with the first gear (68), a second tooth 1g (39) that is formed integrally with the first gear (68) and always meshes with the drive mtM wheel (35), and a gold-containing tooth Intermediate gear body (67
) and the second gear (69) of the intermediate gear body (67),
Only at a predetermined angular position rJII record wJ
A partition wall (4σ) is formed to allow movement of the intermediate gear body (67) along the axis indicated by I with respect to the Jm wheel (66), and A spring means (46) that biases the intermediate gear body (67) so that the first gear (68) is separated from the #I gear (36); The intermediate gear body (67) is moved against the n (n) and the interlocking means (47) which can be operated in order to mesh the first tooth width (68) with the driven gear (66). 2. The driven gear (66) is formed as a bevel gear, and its line of rotation is connected to the intermediate gear part (67).
II′m, and the first one width (68
) is formed as a fan-shaped cap. 3. The intermediate military body (67) is fixed to a support (66) that is attached to the sewing machine frame (11) so as to be movable in the direction of the support, and the above-mentioned series 1. + photo (47) moves its axis. A thread cutting device for a sewing machine according to claim 1 or 2, wherein the thread cutting device is connected to @11 (66) of the sewing machine in order to cut the thread.