JPH0428397B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a switching device for a compound sewing machine in which two stitch forming mechanisms with different sewing functions are arranged in the same machine frame.
Another object of the present invention is to make the entire sewing machine compact by sharing a drive source and a flywheel for the two stitch forming mechanisms.

Second, it is possible to switch between the two stitch forming mechanisms by a simple manual operation of the flywheel while the sewing machine is stopped.

Thirdly, the switching can be completed with a simple switching operation while the sewing machine is stopped, and the main shaft of the stitch forming mechanism, which becomes unselected after the switching operation as in the conventional example, remains in place until the mechanical switching is completed. The purpose of the present invention is to prevent the risk of being rotated by one rotation or less and the impact that the mechanism receives at the time of switching, and to prevent the needle thread of the stitch forming mechanism that has become non-selected due to the rotation from coming off the thread path.

Fourth, the selected seam forming mechanism is reliably connected to the drive source, and the unselected seam forming mechanisms are reliably disconnected from the drive source and locked in the switching phase, and the It is to ensure safety inside.

Fifth, the selected stitch forming mechanism is not only driven by a drive source, but also can be rotated in either the forward or reverse direction by manual operation of the handwheel, and the handwheel can be rotated by hand during sewing work as necessary. The purpose is to allow adjustment by

Sixthly, the selected stitch forming mechanism is stopped together with the flywheel during the thread winding operation, so that the thread winding operation can be performed in a preferable state.

(Example) The present invention will be described below with reference to Examples. 1 to 3, 1 is a compound sewing machine, 2 is a sewing section of a lockstitch mechanism, and 3 is a sewing section of an overlock stitching mechanism. Although these sewing mechanisms are not shown, they are selectively selected and driven by one driving motor via a transmission mechanism and a switching mechanism as described later, and some external force acts on unselected sewing mechanisms. It is locked so that it does not rotate. 4 is a balance,
5 is an upper thread tension device, 6 is a reverse stitching lever, and 7 is a selection dial, and the selected sewing pattern is displayed by an indication line 9 in a display window 8. 10 is a feed dial, 11 is a thread winding shaft of a thread winding mechanism, 12 is a display window for displaying the selected state of the two types of sewing mechanisms described above, 13 is a flywheel, and 13a is an indication line.

The sewing section 3 of the overlock stitching mechanism is located on the left side of the upright body section 14 of the sewing machine when viewed from the operator's side, forward of the base end of the lockstitch free arm section 15, and connected to the rear end 16a of the throat plate surface 16 of the sewing machine. A gap is formed between the arm section 15 and the front surface 15a, which is sufficient to allow the object to be sewn by the sewing section 3 to pass therethrough. Sewing section 3
After sewing, the object to be sewn is configured to pass through the gap and between the lower part of the free arm section 15 and the upper surface of the base 17, so that the object to be sewn does not interfere with the sewing section 2.

Conversely, the workpiece sewn in sewing section 2 is sewn in sewing section 3.
Since it is covered by a safety cover 18 and an auxiliary safety cover 19 made of a transparent material attached to the safety cover, sewing can be performed without interfering with the sewing section 3. Reference numeral 20 denotes a cloth waste guide plate, which is used to guide and discharge cloth scraps cut by the scalpel 21 during overlock sewing and cloth dust generated during cutting out of the sewing machine body. As shown, there is an operating section 22a in front of it.
It can be covered by a front cover 22 which is slid through the front cover 22.

Next, the switching device will be explained. In a compound sewing machine, it is important for safety that while one stitch forming mechanism is in operation, the other stitch forming mechanism is stopped. In particular, its importance becomes even greater when the sewing sections 2 and 3 of the double-sided sewing mechanism are arranged with the front surface of the sewing machine as the front, as shown in FIG.

Further, in order to make the sewing machine compact, it is preferable to share one drive source, and for this reason, a selection and switching device for the drive source of the double-sided stitching mechanism is required.

In Fig. 4, there is an overlock mark 23 and a lockstitch mark 24 on the flywheel side surface of the sewing machine body.
is displayed, and the instruction line 13a of the flywheel 13
As will be described later, when the sewing mechanism is operated in accordance with these marks, the sewing mechanism is selectively operated and the selected state of the sewing mechanism is displayed on the display window 12 of the sewing machine main body.

Next, description will be given mainly with reference to FIGS. 5 to 7. 25 is a belt wheel bushing, and the outer peripheral part 2
5a is formed with a declutch seat 25b, and the screw 2
6 to the drive shaft 27. A washer 30 having a pin 30a implanted therein is fixed to the belt pulley bush 25 by a screw 31 via a washer 28 and a spring receiver 29.

The clutch lever 32 has a hole 32a and a protrusion 32.
A guide portion 32d having a guide groove 32c is formed, and the clutch lever is pivotally supported on a pin 30a of the washer 30 through a hole 32a.

A belt pulley 33 is fitted to the outer circumferential portion 25a of the belt pulley bush 25 via its inner circumferential portion 33a, and the clutch lever 32 is fitted with a torsion coil spring 3 held between the clutch lever and the spring receiver.
4, the protrusion 32 is centered around the pin 30a of the washer 30.
b is biased away from the surface 29a of the spring receiver 29, and the guide portion 32d enters the space between the upper surface of the auxiliary plate 35 placed on the declutching seat 25a and the inner peripheral portion 33a, and the guide portion 32d forms a guide groove. 32c guides the rod 36 toward the narrower side of the space.

The washer 37 is attached to the belt wheel bushing 25 by a screw 38.
The inner periphery 37a of the washer 39 is fitted onto the outer periphery 25a of the belt pulley bushing 25 and the upper surface of the auxiliary plate 35, and the washer 3
The side surface of 9 is brought into contact with the side surface of the belt pulley 33,
Together with the washer 28, the axial movement of the belt sheave 33 relative to the belt sheave bush 25 is restricted.

A knurled portion 33b and a belt toothed portion 33c are formed on the belt pulley 33. The knurled portion 33b drives a peg mechanism during thread winding, which will be described later.
It is connected to a motor (not shown) as a driving source via a motor (not shown).

Reference numeral 41 denotes a bearing cylinder, which is fixed to the machine frame, and the drive shaft 27 is fitted into the inner cylinder part.

Reference numeral 42 denotes an overbelt wheel, which is connected to the overlock sewing mechanism via a belt 43 that is looped around a belt toothed portion 42a that is loosely fitted onto the drive shaft 27. A guide groove 42b, a locking groove 42c, and a screw hole 42d are formed on the side surface of the overbelt wheel 42.

The axial position of the overbelt wheel 42 is regulated by a ring 45 fixed to the drive shaft 27 with a screw 44, and a part of the end surface 42e slides into contact with the end surface of the overcoupling ring 47 fixed to the drive shaft 27 with a screw 46. I'm forced to. 48 is a connecting claw, a claw portion 48a,
Relief groove 48 for locking groove 48b and drive shaft 27
c is formed. The connecting claw 48 has an escape groove 48c
When the drive shaft 27 is inserted through the drive shaft 27, the claw portion 48a is guided by the end surface of the over-coupling ring 47 and the guide groove 42b, and the claw portion 48a is engaged with the over-coupling ring 47 by a spring 50 whose one end is fixed to the over-belt wheel 42 with a screw 49. It is biased in a direction to engage with the stop groove 47a. The drive shaft 27 is a bearing sleeve 5 fixed to the machine frame.
1, and a lockstitch connecting ring 53 is fixed to the drive shaft by a screw 52.

Reference numeral 54 denotes a lockstitch belt pulley, which is connected to the lower shaft of the lockstitch mechanism via a belt 56 that is loosely fitted onto the lockstitch upper shaft 55 and looped around the belt gear 54a. A guide groove 54b and a locking groove 54c are provided on the side surface of the lockstitch belt pulley 54.
and a screw hole 54d are formed.

The axial position of the lockstitch belt pulley 54 is regulated by a ring 58 fixed to the lockstitch upper shaft 55 with a screw 57, and a part of the end surface 54e is brought into sliding contact with the end surface of the lockstitch connection ring 53. Reference numeral 59 denotes a connecting claw, which has a claw portion 59a, a locking groove 59b, and an escape groove 59c for the lockstitch upper shaft 55. The connecting claw 59 is guided between the end face of the lockstitch connecting ring 53 and the guide groove 54b with the lockstitch upper shaft 55 inserted into the relief groove 59c, and is a spring whose one end is fixed to the lockstitch belt pulley 54 with a screw 60. 61 urges the claw portion 59a in a direction to engage with the locking groove 53a of the lockstitch connecting ring 53.

The switching shaft 63 is rotatably supported by the machine frame, and the lockstitch switching arm 66 and the over-switching arm 6 are connected to the switching shaft by sandwiching a thrust stop 65 fixed with a machine frame screw 64.
7 are fixed by screws 68 and 69, respectively. A locking claw portion 66a is formed at one end of the lockstitch switching arm 66, and an operating piece 70 of a micro switch is opposed to the other end 66b.

A locking claw portion 67a and a hole portion 67b are formed in the over switching arm 67, and a switching spring 73 is disposed between the hole portion 67b and a hole portion 72a of a spring receiver 72 fixed with a machine frame screw 71. As shown in FIG. 10, in the swing range of the over-switching arm 67 about the switching shaft 63, the hole 67b of the over-switching arm is
2a and the hole 67b, the over switching arm 67 is urged downward, and the locking claw 67a engages the locking groove 48b of the connecting claw 48 and the overswitching arm 67. The lockstitch switching arm 66 is locked in the locking groove 42c of the belt pulley 42, and the locking claw portion 66a is separated from the locking groove 59b of the connecting claw 59 and the locking groove 54c of the lockstitch belt pulley 54. When the hole 67b of the over-switching arm crosses the line C above the figure, the over-switching arm 67 is urged upward,
The locking claw portion 67a is separated from the locking groove 48b of the connecting claw 48 and the locking groove 42c of the overbelt wheel 42, and the lockstitch switching arm 66 is moved away from the locking claw portion 66a.
are the locking groove 59b of the connecting claw 59 and the lockstitch belt pulley 5.
4 is engaged with the locking groove 54c. Switching shaft 63
A switching gear 75 is fixed to the other end by a screw 74, and the switching gear is formed with a gear portion 75a and a display portion 75b for displaying the selected state of the sewing mechanism from the display window 12 of the sewing machine, as described later. There is. The display section 75b consists of a lockstitch display 75c and an overlock stitch display 75d, and these displays may be designed so that the selected state can be identified by pictures or colors in addition to the character codes shown in FIG. good.

The gear block 76 is fixed to the machine frame with screws 77 and 78, and has a guide hole 76b formed in the arm 76a.
A stopper pin 79 is fitted into the stopper pin 79, and is biased to the right in FIG. 7 by a spring 81 via an E-ring 80 secured to the pin.

A flywheel gear 82 is rotatably fitted onto the outer diameter of the boss portion 76c of the gear block 76, and thrust-locked by an E-ring 83. The gear portion 82a meshes with the gear portion 75a of the switching gear 75 and the arm portion 82.
As will be described later, the pin 84 protruding from the flywheel 8
3, and the flywheel gear 82 is rotated by the flywheel.
A drive shaft 27 is provided on the inner diameter of the boss portion 76c of the gear block 76.
is inserted concentrically with the inner diameter with a gap in between.

An indicator line 13a is formed on the outer periphery of the flywheel 13, and a pair of drive pins 13b and 13c and a switching hole 13d are formed in a constant positional relationship with the indicator line. Reference numeral 85 denotes a phase plate in which a pair of drive grooves 85a and 85b and a pair of drive grooves 85c and 85d are formed in a fixed positional relationship.
5e is formed.

A flywheel 1 rotatably fitted to a drive shaft 27
3 is E engaged with the groove 27a of the drive shaft 27.
A spring 88 is applied to the seventh drive shaft 27 through a ring 86 and a washer 87 fitted to the drive shaft.
The end surface of the phase plate 85 is biased to the right in the figure and is fixed to the shaft end 27b of the drive shaft 27 with a screw 89 at a constant rotational phase, and the pair of drive pins 13b
and 13c will be described later, in the selected state of the lockstitch mechanism, the drive grooves 85a and 85 of the phase plate are moved in this order, respectively.
b. 90 is a flywheel lid,
The claws 90a formed at three locations are connected to the groove 85e and the drive groove 8.
5c and 85b.

Next, the thread winding mechanism will be explained. In FIG. 8, a bobbin arm 91 rotatably holds a bobbin shaft 11 to which a bobbin rubber 92 is fixed, and is pivotally supported by a stepped screw 93 attached to the machine frame. The spring 94 is locked between the machine frame and the pin portion 91a of the bobbin arm 91, and the spring urges the bobbin arm 91 clockwise around the step screw 93, causing the bobbin rubber 92 to be pushed against the belt pulley 3.
a state in which it is separated from the knurled portion 33b of No. 3;
is biased counterclockwise around the step screw 93,
The thread-wound rubber 92 is attached to the knurled portion 33 of the belt pulley 33.
It is positioned in a state where it is brought into pressure contact with b.

The unclutching arm 95 is pivotally supported by a shoulder screw 96 attached to the machine frame, and is biased clockwise in FIG. , in the state where the thread is not wound, the locking surface 95a of the declutching arm 95
is brought into contact with the corner portion 91b of the bobbin winding arm 91, and the bobbin winding state is established, that is, the bobbin winding arm 91 is rotated counterclockwise in the figure around the step screw 93, and the bobbin rubber 92 is brought into contact with the knurled portion of the belt pulley 33. When pressed against the clutch lever 33b, the protrusion 91b separates from the locking surface 95a, and due to the biasing force of the spring 97, the lower end 95b enters the locus of movement of the protrusion 32b of the clutch lever 32.

(Function) Next, the function of the embodiment of the present invention will be explained.
To switch from lockstitch selected to overlock stitch, press the handwheel 1 while the sewing machine is stopped.
3 by hand to align the instruction line 13a with the lockstitch mark 24 to set the handwheel 13 to the first switching phase, and then push the handwheel in the direction of the arrow B in Figure 9, clockwise as seen from the side of the handwheel 13. When rotated, the indicator line 13a aligns with the overlock mark 23.

When the hand is released in this state, the flywheel 12 is pushed out in the direction opposite to the direction of arrow B in FIG. 9, and the overlock stitch is selected. At this time, an overlock stitch display 75d is displayed on the display window 12, a lock stitch lamp (not shown) goes out, and an overlamp (not shown) lights up.

Next, to switch from the state in which overlock stitching is selected to lockstitch, turn the handwheel 13 by hand while the sewing machine is at or above the stop position to align the instruction line 13a with the overlock mark 23 and set the second switching phase of the handwheel 13. After that, push the flywheel in the direction of the arrow B in FIG. 9 and turn it counterclockwise when viewed from the flywheel side, so that the instruction line 13a aligns with the lockstitch mark 24.

When the hand is released in this state, the flywheel 13 is pushed out in the direction opposite to the direction of arrow B in FIG. 9, and lockstitch is selected. At this time, the lock stitch display 75c is displayed on the display window 12.
is displayed, the lockstitch lamp lights up, and the overlamp goes out.

The above will be explained in detail.

When the lockstitch is selected, as shown in FIG. 10, the over-switching arm 67 resists the spring 50 due to the biasing force of the switching spring 73, and moves the connecting pawl 48 guided by the guide groove 42b of the over-belt wheel 42. The locking claw portion 67a pushes the claw portion 48a over the connecting ring 4.
7 through the locking groove 47a to disconnect the drive shaft 27 and the overbelt wheel 42,
7a is engaged with a locking groove 48b of the connecting pawl 48 and a locking groove 42c of the overbelt wheel 42. Therefore, the over coupling ring 4 fixed to the drive shaft 27
7 does not transmit rotation to the overbelt wheel 42 and does not rotate even if some external force is applied to the unselected overlock sewing mechanism connected to the overbelt wheel 42 via the belt 43, thereby ensuring safety. It is maintained. At the same time, in this state, the locking claw portion 66a of the lockstitch switching arm 66 is separated from the lockstitch belt pulley 54 and the lockstitch connecting ring 58, and the connecting claw 59 guided by the guide groove 54b of the lockstitch belt pulley 54 is spring 61
, and the claw portion 59a engages with the locking groove 53a of the lockstitch connecting ring 53.

Therefore, when the drive shaft 27 is driven, the lockstitch connecting ring 53, the connecting pawl 59 and the lockstitch belt pulley 54
The lockstitch mechanism is driven via the. In this state, the other end 66b of the lockstitch switching arm 66 is pushing the operating piece 70 of the microswitch, so the lockstitch lamp is lit and the overlamp is extinguished. Further, an indication 75c of the lock stitch of the switching gear 75 is displayed on the display window 12.

To switch from the lockstitch selected state to the overlock stitch, turn the handwheel 13 by hand while the sewing machine is stopped and move the instruction line 13a to the lockstitch mark 2.
4 and the first switching phase, the locking groove 54c of the lockstitch belt pulley 54 and the locking groove 5 of the connecting pawl 59
9b is in a phase where it can engage with the locking claw portion 66a of the lockstitch switching arm 66, and the switching hole 13 of the flywheel 13
d matches the pin 84 of the flywheel gear 82, and the hole 98a of the belt body 98 matches the stopper pin 79.
matches the position of Therefore, the flywheel 13 is the ninth
It becomes possible to push in the direction of the arrow in Figure B. Even if you try to push the flywheel 13 in other phases, the stopper pin 79 is pushed by the surface 13e of the flywheel 13.
is blocked by the surface 98b of the belt body 98, and the flywheel 13 cannot be pushed in.

When the handwheel 13 is pushed in the direction of the arrow B in FIG. 9 against the spring 88 in the first switching phase of the flywheel 13 when the instruction line 13a is aligned with the lockstitch mark 24, the stopper pin 79 is pushed by the surface 13e of the flywheel 13. and enters the hole 98a of the belt body 98 and drives the drive shaft 27.
The lockstitch mechanism and the locking claw portion 67 of the overswitching arm 60 that are engaged with the drive shaft 27 lock the rotation of the
The overlock sewing mechanisms locked at point a do not rotate even if external forces are applied to them. At the same time, the pin 84 of the flywheel gear 82 enters the switching hole 13d of the flywheel 13, and the drive pins 13b and 13c of the flywheel 13 are removed from the drive grooves 85a and 85b of the phase plate 85, allowing the flywheel 13 to rotate with respect to the drive shaft 27. Become. Next, attach the handwheel 13 to the overlock stitch mark 2.
3, the flywheel gear 82 rotates clockwise via the pin 84, and the switching gear 75
is rotated counterclockwise with the switching shaft 63.

In this case, the flywheel 13 has overlock mark 2.
Even if an attempt is made to rotate in the opposite direction to direction 3, the over switching arm 67 acts as a stopper and cannot be rotated in that direction.

When the switching shaft 63 is rotated counterclockwise,
The over switching arm 67 has a hole 67b that connects the line segment C to the 10th
Since the upper part of the drawing moves upward, the urging force of the switching spring 73 causes the locking pawl portion 67a to separate from the locking groove 42c of the overbelt wheel 42 and the locking groove 48b of the connecting pawl 48, and the connecting pawl 48 is attached to the spring 50. The claw portion 48
a engages with the locking groove 47a of the over-connection pawl 47.

At the same time, the lockstitch switching arm 66 has its locking claw portion 66a.
However, due to the biasing force of the switching spring 73 that resists the spring 61, the claw portion 59a of the connecting claw 59 is attached to the lockstitch connecting ring 5.
3 through the locking groove 53a, and disconnects the drive shaft 27 from the lockstitch belt pulley 54, and connects the connecting claw 59.
The locking groove 59c of the lockstitch belt pulley 54 and the locking groove 5 of the lockstitch belt pulley 54
4c.

At the same time, the other end 66b of the lockstitch switching arm 66 separates from the operating piece 70 of the micro switch, the lockstitch lamp goes out, the overlamp lights up, and the switching gear 75 is rotated via the handwheel gear 82, and the display An overlock stitch display 75d is displayed in the window 12. Next, when the hand is released from the flywheel 13, the flywheel 13 is pushed out in the direction opposite to the direction of the arrow B in FIG. state.

In this state, when the drive shaft 27 is driven,
The overlock stitching mechanism is driven via the overcoupling ring 47, the coupling pawl 48, the overbelt wheel 42, and the belt 43, and as described above, the locking pawl portion 66a of the lockstitch switching arm 66 connects to the drive shaft 27 for lockstitching. While cutting off the connection with the belt pulley 54, the locking groove 59c of the connecting claw 59 and the locking groove 54c of the lockstitch belt pulley 54 are removed.
Since the non-selected lockstitch mechanism is engaged with the lockstitch mechanism, the non-selected lockstitch mechanism is not operated, and even if some external force is applied, it does not rotate and safety is maintained.

In order to switch from the state in which the overlock stitching mechanism is selected to the lockstitch, when the sewing machine is stopped and the handwheel 13 is turned by hand so that the instruction line 13a meets the overlock mark 23 and the handwheel 13 is in the second switching phase, Locking groove 4 of overbelt wheel 42
2c and the locking groove 48b of the connecting claw 48 are in a phase where they can engage with the locking claw portion 67a of the over switching arm 67, and the switching hole 13d of the flywheel 13 is aligned with the pin 84 of the flywheel gear 82, and the belt wheel body 98 The hole 98a matches the position of the stopper pin 79. Next, the flywheel 13 is moved to the ninth position against the spring 88.
When pushed in the direction of the arrow in FIG. B, the stopper pin 79 enters the hole 98a of the belt body 98 and locks the rotation of the drive shaft 27. At the same time, the switching hole 13 of the flywheel 13
d is engaged with the pin 84 of the flywheel gear 82, and the drive pins 13b and 13c are engaged with the drive groove 85 of the phase plate 85.
c and 85d, so when the handwheel 13 is rotated in the direction of the lockstitch mark 24, the switching gear 75 is rotated clockwise together with the switching shaft 63, contrary to the switching described above, and the over switching arm 67, since the hole 67b crosses the line segment C downward in FIG.
The switching spring 73 causes the locking pawl 67a to push out the pawl 48a of the connecting pawl 48 from the locking groove 47a of the over-coupling ring 47, cutting off the connection between the drive shaft 27 and the over-belt wheel 42, and at the same time disconnecting the connecting pawl 48. Retaining groove 48b and overbelt wheel 42 retaining groove 42c
engage with.

At the same time, in the lockstitch switching arm 66, the locking claw portion 66a is separated from the locking groove 54c of the lockstitch belt pulley 54 and the locking groove 59b of the connecting claw 59 due to the biasing force of the switching spring 73, and the connecting claw 59 The claw portion 5
9a engages with the locking groove 53a of the lockstitch connecting claw 53. At the same time, the other end 66b of the lockstitch switching arm 66 pushes the operating piece 70 of the micro switch, the lockstitch lamp lights up, the overlamp goes out, or the switching gear 75 is rotated via the handwheel gear 82, and the display A lock stitch display 75c is displayed on the window 12.

Next, when you let go of the flywheel 13, the flywheel 1
3 is pushed out in the opposite direction to the arrow B in Figure 9,
The drive pins 13b and 13c engage with the drive grooves 85a and 85b of the phase plate 85, resulting in a lock stitch selection state.

In this state, when the drive shaft 27 is driven as described above, the lockstitch mechanism is driven via the lockstitch connecting ring 53, the connecting pawl 59, and the lockstitch belt pulley 54, and the overswitching arm 67 is operated by the locking pawl. Part 67a
However, since the drive shaft 27 and the overbelt wheel 42 are disconnected from each other and engaged with the locking groove 48b of the connecting pawl 48 and the locking groove 42c of the overbelt wheel 42, the unselected overlock sewing mechanism is not operated. not,
Furthermore, even if some external force is applied, safety is maintained without rotating.

According to the present invention, as described above, the drive source and the flywheel 1 are provided for the lockstitch mechanism and the overlock stitch mechanism.
3 are shared and selectively switched by the switching device, the entire sewing machine can be constructed compactly.

As described above, when switching from lock stitch to overlock stitch in switching the sewing mechanism, the sewing machine is stopped, the flywheel 13 is set to the first switching phase, and the flywheel 13 is pushed in the axial direction and the instruction line 13a is pressed.
After rotating the sewing machine until it aligns with the overlock stitch mark 23, the switch is completed by letting go of the handwheel 13. When switching from overlock stitch to lockstitch, the sewing machine is similarly stopped and the handwheel 13 is moved to the second stitch. Push the handwheel 13 in the axial direction in accordance with the switching phase of
The switching is completed by letting go of the flywheel 13 after rotating the switch until it is aligned with the switch, making the switching operation easy and unlike the conventional example, the stitch forming mechanism that becomes unselected after the switching preparation operation can be changed. It is possible to prevent the danger of the main shaft being rotated by one rotation or less and the impact that the mechanism receives when switching, and also to prevent the upper thread of the stitch forming mechanism that has become non-selected due to the rotation from coming off the thread path. be able to.

The sewing mechanism selected in each of the above-mentioned lockstitch mechanism and overlock stitching mechanism is rotated by the drive source, and the belt pulley bush 25 is fixed to the drive shaft 27 by the screw 26. It can also be operated by manually rotating the flywheel 13 in the forward direction (counterclockwise when viewed from the flywheel side) and in the reverse direction. Therefore, it is possible to adjust the flywheel 13 by hand as necessary during sewing. Next, the thread winding operation will be explained. To wind a bobbin, a bobbin bobbin (not shown) is set on the bobbin shaft 11, and the bobbin arm 91 is rotated counterclockwise in FIG. Due to the biasing force of 97, the threaded rubber 92 is moved in the same direction, and the threaded rubber 92 is brought into pressure contact with the knurled portion 33b of the belt pulley 33. In this state, the arm portion 91b separates from the locking surface 95a, and the unclutching arm 95 is rotated clockwise in FIG. 8 by the spring 97 around the step screw 96, and when the lower end 95b enters the locus of movement of the protrusion 32b of the clutch lever 32 and rotates the motor, the lower end 95b engages with the protrusion 32b, and the clutch lever 32 releases the roller 36, so the belt pulley 33 idles relative to the belt pulley bush 25, and the threaded rubber 9 is rotated by the knurled portion 33b.
The thread winding shaft 11 is rotated via the thread 2 to perform thread winding. During this time, the flywheel 13 whose driving source is the belt pulley bush 25 and the selected sewing mechanism are in a stopped state. Of course, the sewing mechanisms that are not selected are stopped. When the bobbin arm 91 is released from the bobbin winding state after winding the bobbin, the bobbin rubber 92 separates from the knurled portion 33b of the belt pulley 33 and rotation is no longer transmitted to the bobbin winding shaft 11. At the same time, the corner portion 91b of the bobbin winding arm 91 releases the declutching arm 95. By rotating the step screw 96 in the counterclockwise direction in FIG. 8, the lower end 95b of the declutching arm 95 is out of the locus of movement of the protrusion 32b of the clutch lever 32, so that the clutch lever 32 returns the roller 36 to its original state. to be restored. Therefore, the rollers 36 again transmit the driving force from the belt sheave 33 to the belt sheave bush 25, and the selected sewing mechanism is driven together with the flywheel 13.

(Effects) As described above, according to the present invention, there are two different sewing mechanisms.
In a compound sewing machine in which two stitch forming mechanisms are arranged in the same machine frame, firstly, the entire sewing machine can be configured compactly by sharing a driving source and a flywheel for the two stitch forming mechanisms. I can do it.

Second, switching between the two stitch forming mechanisms can be performed by a simple manual operation of the flywheel while the sewing machine is stopped.

Thirdly, the switching can be completed by a simple manual switching operation while the sewing machine is stopped, so that the main shaft of the stitch forming mechanism, which becomes unselected after the switching operation as in the conventional example, completes the mechanical switching. It is possible to prevent the risk of being rotated less than one rotation during the rotation and the impact that the mechanism receives when switching, and also to prevent the upper thread of the stitch forming mechanism that has become non-selected due to the rotation from coming off the thread path. .

The fourth selected seam forming mechanism is reliably connected to the drive source, and the unselected seam forming mechanisms are reliably disconnected from the drive source and locked in the switching phase. You can ensure safety inside.

Fifth, the selected stitch forming mechanism is not only driven by a drive source, but also can be rotated in either the forward or reverse direction by manual operation of the flywheel. Can be adjusted by hand.

Sixth, since the selected stitch forming mechanism is stopped together with the flywheel during the thread winding operation, the thread winding operation can be carried out in a preferable condition, which has a remarkable effect.

[Brief explanation of drawings]

The drawings relate to an embodiment of the present invention; FIG. 1 is a front view of a compound sewing machine, FIGS. 2 and 3 are perspective views of the compound sewing machine, and FIG. 2 shows a state in which lockstitch free arm work is possible; FIG. 3 shows the state in which overlock sewing work is possible. Figure 4 is a view from arrow A in Figure 1.
FIG. 5 is an exploded perspective view of the main parts of the belt pulley and declutching mechanism, FIG. 6 is an exploded perspective view of the main parts of the switching device, FIG. 7 is an exploded perspective view of the main parts of the switching device not shown in FIG. The figure is an exploded perspective view of the main part of the bobbin winding mechanism, FIG. 9 is a vertical cross-sectional view of the switching device and the main part of the bobbin winding mechanism, and FIG. Figure 11 is the 9th
A vertical cross-sectional view showing the sewing mechanism as seen in the direction of arrow B in the figure and explaining the operation of the bobbin winding mechanism, and FIG. 12 mainly shows the engagement relationship between the phase plate and the drive pin of the flywheel as seen in the direction of arrow B in FIG. FIG. 1 is a compound sewing machine, 13 is a flywheel, 13a is an instruction line, 23 is an overlock stitch mark, 24 is a lock stitch mark, 27 is a drive shaft, 42 is an overbelt wheel,
47 is an over connection ring, 48 is a connection claw for overlock, 53 is a lock stitch connection ring, 54 is a lock stitch belt pulley, 55 is a lock stitch upper shaft, 59 is a connection claw for lock stitch, 63 is a switching shaft, 66 67 is an overswitching arm, and 98 is a belt body.

Claims (1)

[Scope of Claims] 1. In a compound sewing machine in which sewing mechanisms with different sewing functions are arranged in the same machine frame, the machine frame is rotatably supported, and a flywheel at one end has a constant rotational phase relationship. a drive shaft that is connected to the drive shaft and driven by a drive source through the belt vehicle body, and an overbelt that guides a connecting pawl for overlock together with an overconnection ring that is rotatably fitted to the driveshaft and fixed to the driveshaft. a lockstitching wheel, an upper lockstitch shaft rotatably supported on the machine frame, and a lockstitch connecting ring rotatably fitted to the lockstitch upper shaft and fixed to the drive shaft; a lockstitch belt pulley that guides the connecting pawl; a switching shaft that is rotatably supported on the machine frame and rotated in conjunction with the switching operation of the flywheel; and a lockstitch belt pulley that is fixed to the other end of the switching shaft and that is A position where the connection between the lockstitch connecting ring and the lockstitch belt wheel is cut off by a switching operation and the lockstitch connecting claw and the lockstitch belt wheel are locked to the machine frame, the lockstitch connecting ring, and the lockstitch belt. A lockstitch switching arm that can be switched to the position where it is connected to the car,
A connecting claw for the overlock and an overbelt wheel, which are fixed to the other end of the switching shaft and are connected to a position where the overconnection ring and the overbelt wheel are connected by the switching operation, and which disconnect the overconnection ring and the overbelt wheel. and an overswitching arm that can be switched to a position where the handwheel is locked to the machine frame, and the switching operation of the flywheel is performed when the sewing machine is stopped, and the sewing machine also switches from lockstitch to overlockstitch and from overlockstitch to lockstitch. Then, by adjusting the switching phase to the first switching phase and the second switching phase in this order, the handwheel can be pushed into the sewing machine, and after pushing the handwheel, the handwheel is rotated to select the indicated line. 1. A switching device for a compound sewing machine, characterized in that the sewing mechanism is switched by releasing the push-in of the flywheel after aligning with the sewing mark. 2. The switching device for a compound sewing machine as set forth in claim 1, wherein the drive shaft is locked to the machine frame when switching is performed from the outside using the flywheel.