JPS5939154B2 - Sewing machine drive device - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a driving device for a sewing machine, in which the needle bar moves once in response to pressure from a controller to form a stitch, and then the needle is removed from the workpiece, raised, and then stopped. It is.

Embodiments of the present invention will be described below with reference to the drawings.

In each of the embodiments of the present invention, the motor gradually rotates at a higher speed as the controller is pressed more strongly, the motor gradually rotates at a lower speed as the controller is released, and the motor rotates at a lower speed as the controller is released. This figure shows what has been implemented on a known household sewing machine that stops.

1) First Embodiment The first embodiment will be explained with reference to FIGS. 1 and 2. The main shaft 2, which is rotatably supported on the machine frame 1, has a shaft portion that protrudes from the machine frame 1. The cylindrical sleeve 3 is fixed to the near part (left side in Figure 2), and the sleeve 3 is fixed to the part far from the machine frame.
An inner ring 4 having the same outer diameter as the sleeve 3 is rotatably fitted into the sleeve 3 with its end faces abutted against each other.

On the other hand, an actuating body 7 having two engaging parts 5 and 6 having different axial directions on the outer circumference is arranged with a gap provided between the outer circumferences of the sleeve 3 and the inner ring 4, and one end is engaged with the sleeve 3 in the gap. Then, the clutch spring 8, whose other end is locked to the actuating body 7, is loosely fitted.

In addition, a pulley 11 having a shaft portion 9 and an annular V-groove 10 is integrally provided on the inner ring 4, and the pulley 11 has a groove 1G.
A V-belt 17 is passed between the motor 15 and the pulley 16 of the motor 15 supported on the machine frame 1.

A coil spring 14 is hung between both ends of a C-shaped rotating body 13 that is loosely fitted to the shaft 9 of the pulley 11 with a friction member 12 having an appropriate frictional resistance such as cork sandwiched therebetween. The friction member 12 is provided so as to press against the shaft portion 9 of the pulley 11.

Further, one or more engaging portions 18 are provided on the outer periphery of the rotating body 13.

A cam body 20 having cam surfaces a, b and protrusions c, d is attached to a support 19 fixed to the machine frame 1 from the outside of the sewing machine 1 via a selection dial 21. The link 23 is supported so as to be rotatable about the shaft 22 until it engages with the shaft 22 , and one end of the link 23 is rotatably supported on the shaft 24 , and one of the two arms 25 is connected to the rotary body 13 . The first stop body 27 is arranged opposite to the moving path of the engaging part 18 of the outer ring 7 and the other arm part 26 is arranged opposite to the moving path of the engaging part 5 of the outer ring 7. do.

In addition, a coil spring 28 is hooked and passed between the link 23 and the machine frame 1 so as to press the link 23 against the cam body 20,
There is elasticity between the first stop body 27 and the support body 19 that is weaker than the frictional force between the pulley 11 and the rotating body 13 when the motor 15 rotates, and stronger than the rotational resistance of the pulley 11 when the motor 15 is stopped. Kake hands over the coiled spring 29 with force.

It is made rotatable on a shaft 30 fixed to the machine frame 1, and can be displaced beyond its neutral line to the positions indicated by the solid line and the two-dot chain line in Fig. 5 by the acting force of an elastic body 33 whose one end is supported by the fixed shaft 31. The thread winding arm 34 rotatably supports a thread winding shaft 37 which has a thread winding shaft 35 at its lower end and into which a bobbin 36 can be inserted at its upper end, while the fixed shaft 38 always receives a rotational force in the clockwise direction in FIG. An intersecting arm portion 40 is provided at the upper end of the second stop body 39 which is swingably supported, and the pincushion arm 34 is moved from the position of the chain dotted line in Figures 1, 2 and 5 to the position of the solid line in Figure 5. By being displaced, the second stop body 39 follows the arm part 40 and rotates clockwise in FIG.
The vehicle is installed so that it can be entered into the travel route from outside the travel route.

In the figure, reference numerals 41 and 42 are stoppers of the first stop body 27, and in particular, the stopper 42 is a rotatable eccentric shaft so that the stop position of the second stop body 27 can be finely adjusted.

Further, reference numeral 43 denotes an elastic body supported at the tip of the arm portion 26 of the first stop body 27, and is provided so as to be compressed and deformed in the longitudinal direction of the arm portion 26.

This embodiment has the above configuration, and its operation will be explained next.

1 and 2, the link 23 is engaged with the cam surface a of the cam body 20 by the coil spring 28, and one arm portion 25 of the first stop body 27 is shown.
is located outside the moving path of the engaging portion 18 of the rotating body 13, and the other arm portion 26 is held by the coil spring 29 outside the moving path of the retaining portion 5 of the actuating body 7, in a normal sewing state; When the controller is depressed, the motor 15 rotates at a speed corresponding to the amount of depression, which causes the main shaft 2 to continuously rotate in the direction of the arrow, so that the sewing mechanism continuously operates.

That is, in conjunction with the rotation of the motor 15, the pulley 11 and the inner ring 4 rotate around the main shaft 2 in the direction of tightening the clutch spring (in the direction of the arrow), so that the clutch spring 8 tightens the inner ring 4.
and the sleeve 3, these rotate together, and the rotation of the motor 15 is transmitted to the main shaft 2, so that intermediate stitching is performed while the sewing mechanism is operating and the controller is acting.

Next, when the cam body 20 is rotated from the state shown in FIGS. 1 and 2 via the selection dial 21 until the protrusion d hits the stopper 19a, the link 23 resists the coil spring 28 due to the higher cam surface. It is rotated counterclockwise in FIG. 1, and the arm portion 25 of the actuating body 27 enters the moving path of the engaging portion 18 of the rotating body 13 as shown in FIG.

That is, FIG. 7 shows a state in which single stitch sewing has been selected, and when the controller is operated to rotate the motor 15, the pulley 11 rotates via the V-belt 17, and the main shaft 2 moves in the direction of the arrow via the clutch spring. While rotating in the direction,
The rotating body 13 rotates integrally with the pulley 11 in the direction of the arrow due to frictional force via the friction member 12.

Then, even after the engaging portion 18 of the rotating body 13 engages with one arm portion 25 of the first stop body 27, the arm portion 25 remains on the stopper 4.
The first stop body 2γ is rotated clockwise around the shaft 32 until it hits the first stop body 2.
The other arm portion 26 of the actuating body 7 enters the moving path of the retaining portion 5 of the actuating body 7 .

On the other hand, after the rotating body 13 engages with the arm portion 25 of the first stopper 27 and stops, the pulley 11 moves to the engaging portion 1 of the rotating body 13.
8 is pressed against the arm portion 25 of the first stop body 27 and rotates while sliding against the rotating body 13, and the friction force generated at that time causes the first stop body 27 to resist the coil spring 29 and rotate as shown in FIG. Hold at the position indicated by the dotted chain line.

When the needle bar reaches substantially the uppermost position, the engaging portion 5 of the actuating body 7 engages with the arm portion 26 of the first stopper 27, and the rotation of the actuating body 7 is stopped.

As a result, the winding of the clutch spring 8 expands and its inner peripheral surface separates from the inner ring 4, so the inner ring 4 idles relative to the clutch spring 8, and the rotation of the shaft 2 stops, and while the controller is acting, the pulley Driving idle.

That is, if the controller is operated in the needle sewing state, the needle bar operates once and then stops at approximately the uppermost position.

Next, when the controller is released and the motor 15 stops rotating, the rotating body 13 and the pulley 1
1 also disappears, and the rotational force of the rotating body 13 disappears, so the first stop body 27 is moved by the coil spring 29 to the rotating body 13.
Then, the pulley 11 is rotated in the opposite direction to return the arm portion 26 to the position shown by the solid line in FIG.

Further, the arm portion 26 of the first stop body 27 is connected to the retaining portion 5 of the actuating body 1.
When the clutch spring 8 is released, the expanded clutch spring 8 returns to its natural state, so that the actuating body 7 slightly rotates in the direction of the arrow from the state shown in FIG.
returns from the compressed state as shown by the two-dot chain line in the figure to the state shown by the solid line, and the pulley 11 rotates under the action of the next controller, causing the actuating body 2γ to move through the engaging portion 18 of the rotating body 13. When rotated clockwise around the shaft 32, the elastic body 43 only contacts the outer periphery of the engaging portion 5, and the arm portion 26 does not immediately engage the engaging portion 5. It rotates in conjunction with the rotation, and performs the same action as described above.

Note that if the arm 26 of the first stopper 27 comes into contact with the outer periphery of the actuating body 7 before the arm 25 of the first stopper 27 hits the stopper 42 due to the rotational force of the rotating body 13, the engaging part 5 of the actuator 7 An accident may occur in which the rotation of the actuator 7 stops due to frictional resistance with the arm 26 even if it does not engage with the arm 26, but in this case, the stopper (eccentric shaft) 42 is rotated and the arm 25 is rotated. The above-mentioned accident can be prevented if the adjustment is made so that a gap is created between the arm portion 26 and the actuating body γ even when the arm 26 hits the stopper 42.

Next, when the bobbin 36 is inserted into the bobbin shaft 37 from the normal sewing state shown in FIG. 1-2, and the bobbin arm 34 is moved from the chain line in FIG. While being pressed against the pulley 11, the arm portion 40 of the bobbin arm 34 moves in the direction of rotation of the second stop body 39, so the second stop body 39 rotates clockwise in FIG. Enter into the movement path of the joining part 6.

Therefore, if the controller is operated from this state, the main shaft 2 will rotate in conjunction with the motor 15 until the engaging portion 6 of the actuating body 7 hits the second stopper 39 and stops, but the rotation of the actuating body 7 will be stopped. After that, the clutch spring 8 and the inner ring 4 slip, so the pulley 11 rotates idly with the rotating body 13 relative to the main shaft 2, and the bobbin shaft 37 rotates via the bobbin winding shaft 35.

Furthermore, since the engaging portion 6 of the actuating body 7 is provided so as to be able to engage with the second stop body 39 when the needle bar is raised substantially to the highest position, the needle bar is at substantially the highest position during winding. will be stopped.

11) Second Embodiment The second embodiment will be explained with reference to FIGS. 3 and 4. The shaft portion of the main shaft 52 rotatably supported on the machine frame 51 that protrudes from the machine frame 51 has a portion close to the machine frame. A cylindrical sleeve 53 is fixed to the sleeve 53 (on the left side in FIG. 4), and an inner ring 54 having the same outer diameter as the sleeve 53 is rotatably fitted in a portion far from the machine frame with its end surfaces abutting against the sleeve 53.

On the other hand, an actuating body 57 having two retaining parts 55 and 56 on its outer periphery is loosely fitted to the outer peripheries of the sleeve 53 and the inner ring 54 with a gap provided, and one end is locked to the sleeve 53 and the other end is fitted into the gap. The clutch spring 58, which is locked to the actuating body 57, is loosely fitted.

In addition, the inner ring 54 includes a shaft portion 59 having a recess 94 and an annular V.
A pulley 61 having a groove 60 is integrally provided, and the pulley 6
A belt 67 is passed between the V-groove 60 of 1 and the pulley 66 of the motor 65 installed in the machine frame 51.

The shaft portion 59 of the pulley 61 has a convex portion 95 that loosely fits into the recess 94, and the rotary link 96 is loosely fitted therein, and as shown in FIG. A coil spring 79 is compressed and disposed between the pulley 61 and the rotating ring 95 so as to normally apply rotational force to the pulley 61 and the rotating ring 96 in the clockwise and counterclockwise directions in FIG. 3, respectively.

A C-shaped rotating body 63 having a plurality of engagement parts 96 on the outer periphery is loosely fitted on the outer periphery of the rotating ring 96, with a member 62 having high frictional resistance such as cork sandwiched therebetween. The coil spring 64 is hooked so as to tighten the member 62 to the outer circumference of the rotating ring 96 on the inner circumferential surface.

Note that the force of the coil spring 79 is weaker than the frictional force between the rotating ring 96 and the rotating body 63.

A shaft 72 fixed to the machine frame 51 has a roller 77 at its free end that can engage with a V-belt 67, and a suitable one-way clutch (not shown) is interposed between the roller 77 and the roller 77 as shown in FIG. An arm body 73 rotatably supported around a shaft 82 is loosely fitted to a first stop body that interlocks with the first stop body when it rotates counterclockwise.

Further, a locking body 75 is attached to the fixed shaft 74 so that one end thereof can enter the movement path from outside the movement path of the engaging portion 68 of the rotating body 63.
to be loosely fitted.

A coil spring 78 is arranged between the machine frames so that a clockwise rotational force as shown in FIG. 3 always acts on the arm body 73.
A coil spring 70 is arranged between the machine frames so that a counterclockwise rotational force always acts on 5, while a selection dial 71 rotatably supported on a fixed shaft 72 is rotated counterclockwise from the position shown in FIG. By rotating the selection dial 7 by a predetermined angle,
The arm body 73 is connected to the coil spring 7 by the protrusions e and f provided in the coil spring 7.
8 in the counterclockwise direction, and at the same time, the locking body 75
are provided so as to be able to rotate clockwise against the coil spring 70.

Also, the coil spring 78 causes the roller 77 to rotate to the V-belt 6.
An adjustment body 69 is provided which engages the arm 73 and is movable and lockable against the coil spring 78 so that the pressure applied to the arm 73 can be adjusted as desired.

Since the second embodiment has the above-described configuration, when the sewing machine is not in operation, the recess 94 of the pulley 61 is
The opposing surfaces of the convex portion 95 of the rotation ring 96 on the side sandwiching the coil spring 79 are separated.

Furthermore, when the selection dial 71 is set to the one-stitch position in FIG. The roller 77 is rotated about 72 as a fulcrum and the V
While coming into pressure contact with the belt 67, one end of the locking body 75 enters into the movement path of the engaging portion 68 of the rotating body 63.

Next, when the controller is actuated to drive the motor 65, the main shaft 52 is connected to the pulley 6 via the clutch spring 58.
On the other hand, since the rotating ring 96 is interlocked with the pulley 61 via the coil spring 79, the rotating body 63 rotates together with the rotating ring 96 via the friction member 62.

When the engaging portion 68 of the rotating body 63 engages with the locking body 75 and its rotation is stopped, the rotating body 63 and the rotating ring 9
6 is stronger than the acting force of the coil spring 79, the coil spring 79 is first compressed by the rotation of the pulley 61, and then the opposing surfaces of the rotation ring 96 and the pulley 61 are joined and rotated. The moving ring 96 rotates in the direction of the arrow while sliding with respect to the rotating body 63, while the main shaft 52 and the operating body 57 rotate in the same direction, and the roller 77 rotates in the same direction.
rotates clockwise in FIG. 3 about the shaft 82 in conjunction with the V-belt 67, so the first stop body 76 enters into the moving path of the engaging portion 55 of the actuating body 57 via the one-way clutch. held in state.

Thereafter, when the needle bar reaches approximately the uppermost position and the engaging portion 55 of the actuating body 57 engages with the first stopper 76, and the rotation of the actuating body 57 is thereby stopped, the main shaft 52, ie, While the needle bar and other sewing mechanisms are stopped and the controller is operating, the pulley 61, rotating ring 96, and inner ring 5
4 rotates idly while sliding on the rotating body 63 and the clutch spring 58, respectively.

Next, from this state, when the action of the controller is stopped and the rotation of the motor 65 is stopped, the pulley 61 is moved by the coil spring T.
9 is rotated from the state shown in FIG. 3 in the opposite direction of the arrow by the gap between the concave portion 94 and the convex portion 95, and the V-belt 67 is rotated in the opposite direction to the direction of rotation by the motor 65, causing the roller 77 to rotate. Since it is rotated counterclockwise, the first stop body 76 rotates counterclockwise around the shaft 82 via the one-way clutch, and its free end disengages from the engagement portion 55, causing the next It will be in a ready state.

Further, after the first stop body 76 and the engaging portion 55 are disengaged, the spread clutch spring 58 returns to its natural state as in the first embodiment, and the actuating body 57 moves in the direction of the arrow. As a result, when the controller is operated next time, the engaging part 55 passes in front of the first stop body 76, and then the first stop body 76 enters the movement path of the engaging part 55. do.

The relationship between the thread winding mechanism and the one-stitch winding mechanism is the same as in the first embodiment.

■) Third Embodiment The third embodiment will be explained with reference to FIG.
6 and the main shaft 102, and at the same time, the belt 117 is passed around the boot IJ-111 fixed to the main shaft 102, and the actuating body 107 having the engaging portion 105 is attached to the boot, as shown in the first and second embodiments, although not shown in detail. It is provided so that it always rotates in the direction of the arrow via the clutch spring when the IJ-111 rotates.

Further, a first stop body 126 having a circular arc 127 centered on a shaft 132 is supported at the upper end of an arm body 123 whose lower end is rotatable around a fixed shaft 122, and the first stop body 126 is rotatably supported around the shaft 132. A coil spring 129 is hooked between the body 126 and the machine frame to apply a rotational force in the counterclockwise direction in FIG. 6 to the first stop body 126.

Note that the force of the coil spring 129 is weaker than the frictional force between the first stop body 126 and the V-belt 117.

Although not shown, a coil spring 128 is hooked between the arm 123 and the machine frame, but is provided so that clockwise and counterclockwise rotational forces are applied to the arm 123 by moving the selection dial to two positions. .

Although not shown, the relationship between the thread winding mechanism and the one-stitch threading mechanism is the same as that of the first embodiment.

Next, when the selection dial is set to the one-stitch position, the force of the coil spring 128 acts clockwise on the arm body 123, and the first stop body 126 is moved as shown by the chain dotted line in Figure 6.
The arc 127 of is pressed against the V-belt 117, and then the controller is actuated to operate the motor, and the Boo IJ-11
1° 116 and the V-belt 117 rotate in the direction of the arrow, the main shaft 102 and the operating body 101 rotate in the direction of the arrow in conjunction with the motor, while the first stop body 126 rotates in the direction of the arrow in conjunction with the V-belt 117. It rotates around until it hits the stopper 142 and enters the movement path of the retaining part 105.

After that ■ While the belt 117 is rotating, the V-belt 11
7, the main shaft 102 continues to rotate, and the first stop body 126 is rotated by the coil spring 1.
29 and is held at the position indicated by the solid line.

When the main shaft 102 substantially rotates and the needle bar reaches the substantially uppermost position, the engaging portion 105 engages with the first stop body 126 and the rotation of the operating body 107 is stopped. Similarly, the winding diameter of the clutch spring increases and the pulley 111 idles relative to the main shaft 102.

That is, the needle bar stops at the highest position and the motor idles while the controller is operating.

Next, when the controller is released to stop the rotation of the motor, the V-belt 117 stops and the clockwise rotational force no longer acts on the first stop body, so the first stop body 126 is moved from the solid line by the coil spring 129. When it is returned to the position indicated by the dotted chain line and the controller is operated next, one stitch will be sewn in the same manner as described above.

As described above, in this invention, the first stopping body is held within the moving path of the engaging portion of the actuating body by the rotational force of the rotating body linked to the motor through frictional force. There is no need to install a power generating means such as an electromagnetic solenoid in addition to the sewing machine's drive motor, which reduces costs. Since the linkage with the spindle is cut off, there is no large impact when the spindle is stopped, which is the case with systems that forcibly stop the spindle while the motor is still in operation.The structure can therefore be simplified, and the motor does not overload. Since the motor does not heat up and generate heat, it extends the life of the motor and provides excellent durability.

In addition, in the first and second embodiments of the present invention, as shown in FIGS. 1 to 4, coil springs are attached to both ends of the rotating body, and the friction member is tightened to the shaft of the pulley with a predetermined force. However, instead of this, as shown in FIG. 8, the left side surface of the rotating body 163 that is rotatably and loosely fitted to the shaft portion 159 of the boot IJ-161, and the right side surface of the boot IJ-161. A movable body 154 is supported on the shaft portion 159 of the boot IJ-161 so as to be movable in the axial direction of the main shaft 152, with a plurality of holes or grooves 153 formed concentrically and with an appropriate friction member 162 disposed therebetween. The free end of a suitable elastic body 164 is supported facing the right side of the rotary body 163, and the adjustment dial 155 is screwed into the threaded part formed in the shaft part 159 of the boo IJ-161, and the adjustment dial 155 is always adjusted. The tip of the set screw 156 screwed into the dial and supported by the movable body 15
The movable body 154 is loosely fitted into the groove 153 of the pulley 161 to prevent the adjustment dial 155 from moving blindly. Move along 159,
The same effect as described above can be obtained even if the contact pressure between the boot IJ-161 and the friction member 162 is configured to be adjustable as desired.

Further, although the above embodiment of the present invention uses a coiled clutch spring, for example,
Even if the arm portion of the first stop body of the present invention is configured to engage the arm 11 of the known clutch means described in Japanese Patent No. 4, the same effect as described above can be obtained.

Further, in the first and second embodiments of the present invention, the rotating body is supported on the outer periphery of the rotating body via a friction member so as to be able to rotate against a predetermined resistance. Even if the body and body are configured to rotate around different axes and are configured so that they are circumscribed, the rotating body and the rotary body may be directly connected to each other so that a predetermined frictional resistance is generated without using a friction member. Even if the configuration is configured to do so, the same effect as described above can be obtained.

Furthermore, in the first embodiment, the arm portion 26 of the first stop body 27
Although an elastic body 43 is provided at the tip of the actuating body, a similar elastic body may be provided at the engaging portion of the actuating body, or an appropriate piece may be attached to the arm portion or the engaging portion through the elastic body. When the arm part and the retaining part are disengaged from each other, the elastic body stretches and pushes out the piece, and when the next stitch is performed, the engaging part moves with the arm part. The arm portion or the engaging portion may be overlapped with each other until it passes in front of the arm portion to ensure that one stitch of hemming is performed, or the portions of each embodiment may be appropriately combined. Effects similar to those described above can be obtained.

[Brief explanation of drawings]

Figure 1 is a front view of the main parts of the first embodiment with some parts omitted;
The figure is a left side view of FIG. 1, partially shown in cross section, FIG. 3 is a front view of the main part of the second embodiment with a part omitted, and FIG. 4 is the left side of FIG. 3, partially shown in cross section. Front view, Figure 5 is 1st and 3rd
Fig. 6 is a front view of the third embodiment, Fig. 7 is an explanatory view of the operation of the first embodiment, and Fig. 8 is a main part corresponding to Fig. 2-4 showing other embodiments. FIG. 2,52 in the figure. . 102.152 is the main axis, 7,57
, 107 is an actuating body, 8, 58 is a clutch spring, i 1,
61. IIL161 and 17, 67.117 are pulleys and belts that constitute the rotating body, 13, 63, 163 are rotating bodies, 27, 76.126 are first stop bodies, 39 are second stop bodies, 21, 7'f are Selection dial, 29°79.12
9 is an elastic body (coil spring) that performs the same action in each embodiment; 15 and 65 are driving bodies (motors); and 34 is a peg arm.

Claims (1)

[Scope of Claims] 1. A motor 15 capable of generating and extinguishing power for driving the main shaft in relation to the operation of a manual switch, and a normal sewing state in which the needle continuously moves up and down in relation to the operation of the manual switch. and a selection means 21 capable of selectively operating a single stitch sewing state in which the needle is pulled out from the workpiece, moves up and down one position from the raised position and stops, and rotating bodies 11 and 17 that rotate in conjunction with a motor. , an actuating body 7 which has a single engagement portion and is rotatable around a main shaft, and when a single stitch sewing state is selected by operating the selection means, the actuating body 7 advances to a position where it frictionally engages with the rotary body and rotates the rotary body. A stop body 27°76.126 whose one end is movably locked within the moving path of the engaging portion of the actuating body, and which retreats and separates from the rotating body when the normal sewing state is selected; and the engagement between the stop body and the actuating body. A clutch means 8 is connected to the rotating body, the main shaft, and the actuating body so as to transmit the power of the motor to the main shaft by frictional force when the joint is not engaged, and to cut off the transmission of the motor power to the main shaft when the joint is engaged. , an elastic force that is weaker than the friction force generated in the transmission system between the motor and the stopping body during operation and stronger than the rotational resistance of the rotating body when the driving body is stopped, and is stored in relation to the rotation of the rotating body. and an elastic body 29, 79, 129 which acts to move the stop body from within the movement path of the retaining part of the operating body to outside the movement path in connection with stopping.