JPS6249890A - 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 Object of the Invention (Field of Industrial Application) This invention relates to a sewing machine, and particularly to a cloth feeding device thereof.

(Prior Art) In general, in a conventional needle feed sewing machine, a feed dog is provided on the sewing machine bed, and is arranged so that it can move up and down and can rotate back and forth in the cloth feeding direction, and is arranged so that it can move up and down and rotate back and forth in the cloth feeding direction. The feed dog is moved four times and the needle is rotated back and forth to intermittently transport the work cloth on the sewing machine bed.

(Problem to be solved by the invention) However, in this conventional needle-feed sewing machine, when the needle is stuck into the workpiece cloth, the feed movement due to the reciprocating rotation of $1 and the feed movement due to the feed south are separated. Since the needle feed sewing machine is configured to be mechanically synchronized, this needle feed sewing machine can also be used as a regular feed sewing machine, in which the feed movement by the feed dog is performed when the needle moves upward from the workpiece cloth. It has been impossible to configure the device so that it can be used by selectively switching it at will because the mechanism becomes complicated.

Structure of the Invention (Means for Solving the Problems) The present invention has been made in view of the above-mentioned problems, and has a needle 9 at the lower end, is movable up and down, and has a sewing machine bed. A needle bar 8 that can reciprocate along the cloth feeding direction about a single axis perpendicular to the cloth feeding direction above the sewing machine bed 2 and a needle 9 that is arranged in the sewing machine bed 2 and move up and down cooperate with each other. Thread loop catcher 10 for forming stitches on work cloth W
A presser foot 48, 49 is provided above the sewing machine bed 2 to press the workpiece cloth W onto the bed surface, and a cloth presser foot 48, 49 is provided between the sewing machine main shaft 4 and the needle bar 8 to control the rotational movement of the sewing machine main shaft 4. a first movement converting mechanism 11 that converts the vertical movement of the needle bar 8 into the vertical movement of the needle bar 8;
a second motion conversion mechanism 16 that converts the rotational motion of the sewing machine main shaft 4 into the reciprocating rotation of the needle bar 8, and the second motion conversion mechanism 1
a reciprocating rotation disabling mechanism 41 that disables the reciprocating rotation of the needle bar 8 by disabling the reciprocating rotation of the needle bar 8;
The cloth feeding rotary body 50, 51 which is intermittently rotated to transfer the work cloth W, and the reciprocating rotation disabler 1 [41] are operated, and the needle 9 is moved from the work cloth W on the sewing machine bed 2. In the normal feed mode, in which the cloth feed rotary body 50.51 is rotated by the drive motor 59.60 when the work cloth starts to be handled upward, the reciprocating rotation disabling mechanism 41 is stopped, and the needle 9 pierces the workpiece cloth W. A switching means 39.degree. 40 is provided which can switch between the needle feeding mode and the mode in which the cloth feeding rotary body 50.51 is rotated by the drive motor 59.degree.

(Function) Therefore, in the sewing machine of the present invention, if necessary,
It is easy to switch between a normal feed mode in which the cloth is fed only by the rotation of the cloth feed rotor 50.51 and a 21 feed mode in which the cloth is fed by the rotation of the cloth feed rotor 50.51 and the reciprocating rotation of the needle 9. , you can conveniently carry out G1 production,
Furthermore, the configuration for this purpose is extremely simple.

(Example) Hereinafter, the present invention will be described in detail based on an example in which the present invention is embodied in a sewing machine that has both needle feed and normal feed functions.

In the sewing machine of this embodiment, as shown in FIG. 1.2, a sewing machine frame 1 is composed of a sewing machine bed 2 and a sewing machine arm 3. A sewing machine main shaft 4 is rotatably supported within the sewing machine arm 3, and a pulley 5 is attached to the right end thereof. As the sewing machine motor (not shown) rotates, the main shaft 4 of the sewing machine is rotated in the direction of the arrow in FIG. 2 via the belt and pulley 5.

As shown in FIG. 2, within the sewing machine arm 3, a needle bar support frame 6 is supported at its lower end by a shaft support 7 so as to be swingable about a horizontal axis perpendicular to the cloth feeding direction.

A needle bar 8 is supported on the needle bar support frame 6 so as to be movable up and down, and a needle 9 is attached to the lower end of the needle bar 8. As the needle bar support frame 6 swings, the needle bar 8 is reciprocated along the cloth feeding direction.As shown in FIG. A thread ring catcher 10 is disposed, and is operated as the main shaft 4 of the sewing machine rotates to form stitches on the work cloth W on the sewing machine bed 2 in cooperation with the needle 9.

A first interlocking conversion ta is provided between the sewing machine main shaft 4 and the needle bar 8.
A horizontal section 11 is provided to convert the rotational movement of the main shaft 4 of the sewing machine into vertical movement of the needle bar 8 and transmit the same. As shown in FIG. 2, a needle bar crank 12 is fixed to the left end of the main shaft 4 of the sewing machine, and a crank is located between the crank pin 13 on the negative side and the needle bar holder 14 on the needle bar 8. rod 1
5 has been set up. The rotation of the needle bar crank 12' based on the rotation of the sewing machine main shaft 4 causes the needle bar 8 to move up and down via the crank rod 15 and the needle bar holder 14.

Further, a second interlocking conversion mechanism 16 is provided between the sewing machine main shaft 4 and the needle bar 8 to convert the rotational movement of the sewing machine main shaft 4 into the needle bar 8.
It is designed to be converted into a reciprocating rotation and transmitted. That is, as shown in FIG. 2.3, an eccentric wheel 17 is fixed to the main shaft 4 of the sewing machine, and an eccentric wheel holder 18 is mounted on the eccentric wheel 17.
is supported in a hug state. A rotating shaft 19 is rotatably supported within the sewing machine arm 3 behind the sewing machine main shaft 4, and a rotating arm 20 is fixed to the right end of the rotating shaft 19.

A connecting rod 21 is rotatably attached to the lower end of the rotating arm 20 at the rear, and the eccentric wheel holder 18 is connected to the central portion of the connecting rod 21 . Further, a swinging arm 22 is fixed to the left end of the rotating shaft 19, and a swinging shaft holder 24 that engages with the swinging shaft 23 on the needle bar support frame 6 is rotatably attached to the lower end of the swinging arm 22. It is being

A feed changer 25 is rotatably supported in the sewing machine arm 3 above the front part of the sewing machine main shaft 4, and at the center of the rear surface there is a circumference centered on the connecting point between the rotary arm 20 and the connecting rod 21. A swing groove 26 having the same circumferential shape is formed, and a gi1w1 shaft 27 having an axial length of 7 is provided on the right side. A pair of left and right square pieces 28 are rotatably supported at the front end of the connecting rod 21, and are pivotally engaged with a rocking groove 26 of the feed switching device 25. Then, the feed switching device 2
5 is rotated and its sliding groove 26 is set at an arbitrary position as shown in FIG. When the eccentric wheel holder 18 is moved up and down with the rotation of the eccentric wheel 17 on the sewing machine main shaft 4, the connecting rod 21 moves back and forth depending on the inclination state of the sliding groove 26. The movement is transmitted to the needle bar support frame 6 via the rotating arm 20, the rotating shaft 19.1, the rotating arm 22, the swing shaft holder 24, and the swing shaft 23, and the movement is transmitted to the needle bar support frame 6 on that side. The rod support frame 6 and the needle bar 8 are designed to be reciprocally rotated in the cloth feeding direction or the opposite direction.
The timing of the reciprocating rotation is set such that the needle bar 8 is rotated toward the cloth feeding side at least while the nail 9 is sticking into the workpiece cloth W on the sewing machine bed 2. Furthermore, when the swing groove 26 is located on the circumference centered on the connecting point between the rotating arm 20 and the connecting rod 21, the connecting rod 21 only rotates around the connecting point, and after iyi. There is no reciprocating movement in the direction.

As shown in FIG. 2, a feed adjuster 29 is rotatably supported in the sewing machine arm 3 by a shaft 30 corresponding to the right end and lower part of the adjustment shaft 27, and its front end has a side surface shaped like a V-shape. A shaped engagement surface 31 is formed. A rotary lever 32 is fixed to the right end of the adjustment shaft 27, and the tip thereof and the feed adjuster 29
There are 33 connections between the two. Feed adjuster 29
Correspondingly, a needle feed adjustment knob 34 is rotatably screwed onto the front surface of the sewing machine arm 3 and constitutes a feed amount setting means for setting the cloth feed port for each stitch during needle feed. , an engagement surface 31 of the feed adjuster 29 is engaged with the rear end of the rotating shaft 35 by the force of a spring (not shown). Then, by rotating the adjustment knob 34 and rotating the feed i51 moderator 2O, the feed switch 25
is set to rotate at an arbitrary position, and the amount of reciprocating rotation of the needle bar 8, that is, the amount of needle advance from zero to a predetermined amount is changed.

As shown in FIG. 2, a needle feed potentiometer 36 is connected to the right end of the shaft 30 of the feed adjuster 29, and by rotating the feed adjustment knob 34, the feed rA node ff529 is rotated, and the needle feed foot is rotated. When the setting is changed, the feed M
It is designed to output a drive signal according to the As shown in FIG. 1, on the right side of the needle feed adjustment knob 34,
1 on the front of sewing machine arm 3 during normal feed.
A normal feed adjustment knob 37 constituting a feed setting means for setting the cloth feed ω for each needle is rotatably screwed together. A normal feed potentiometer 38 is connected to the shaft end of the adjustment knob 37.
When the setting of the feed amount is changed by the rotation operation, a drive signal corresponding to the feed amount is output.

As shown in FIG. 1, a needle feed selection key 39 and a normal feed selection key 40 constituting switching means are arranged on the front surface of the sewing machine arm 3 below the adjustment knobs 34, 37, and these selection keys 39, 40 By selecting and operating , it is possible to switch between needle feed mode and normal feed mode. Moreover, as shown in FIG.
In the interlock conversion mechanism 16, an electromagnetic clutch 41 constituting a reciprocating rotation disabling mechanism is interposed on the rotation shaft 19.
When the normal feed selection key 40 is selected, the electromagnetic clutch 41 is actuated to cut off the rotational transmission of the rotation shaft 19 and disable the second motion conversion mechanism 16. . Further, a solenoid 92 is attached to the sewing machine arm 3 near the rotating shaft 19. This solenoid 92 is energized by turning on the normal feed selection key 40, and its armature 93 protrudes and fits into the holding hole 94 on the rotating shaft 19, whereby the rotating shaft 19 and the swinging arm 22 are rotated. The needle bar 8 is held at the center of its swing range.

As shown in FIG. 6, a rotating disk 42 of a feed swing timing generator is fixed on the main shaft 4 of the sewing machine, and two signal generating slits are provided at opposing positions on different circumferences of the rotating disk 42. 43.44 are formed. A drive timing generator 45 for needle feed and a drive timing generator 46 for normal feed are arranged in the sewing machine arm 3 corresponding to each slit 43, 44 on the rotating disk 42, each of which is composed of a light emitting element and a light receiving element. It consists of a photoelectric sensor.

Then, as the sewing machine main shaft 4 rotates, the needle 9 moves onto the workpiece cloth W.
The needle feed drive timing generator 4
5 detects the outer slit 43 on the rotating disk 42 and outputs a timing signal, and each time the needle 9 is pulled upward from the workpiece cloth W, the drive timing generator 46 for normal feed is activated to detect the outer slit 43 on the rotating disk 42. The timing signal is output by sensing the slit 44 inside.

As shown in FIG. 1.5, a presser foot 47 is provided on the sewing machine arm 3 behind the needle bar 8 so as to be movable up and down, and a presser foot 48 and 49 consisting of a pair of left and right rollers is provided at the lower end of the presser foot 47.
is rotatably supported. Then, a downward pressing force is always applied to the presser bar 47 by a not-shown presser spring, and the work cloth W is pressed onto the bed surface by the cloth presser foot 48, 49. When lifted by the lifting mechanism including the presser foot 48.
The pressure on the work cloth W by 49 is released.

As shown in Figure 1.4.5, both presser feet 48 and 49
A pair of cloth feeding rotors 5 are installed on the sewing machine bed 2 corresponding to the sewing machine bed 2.
0.51 are placed on both the left and right sides of the needle 9.

Each cloth feeding rotary body 50, 51 has four toothed rollers 52.
．． 53, 54, and 55, a timing belt 56 stretched between these rollers 52 to 55, and a tension roller 57. It protrudes above the surface to transport the work cloth W.

A feeding drive motor 59.60 is connected to the toothed roller 54 at the lower front of each cloth feeding rotary body 50.51, and the cloth feeding rotary body 50 is driven by the drive motor 59.60.
0.51 is intermittently rotated in the cloth feeding direction.

Next, the control circuit of the sewing machine constructed as described above will be explained with reference to FIG.

Now, the central processing unit (CPU) 81 constituting the control means in this control circuit has a read-only memory (R
OM) 82 and random access memory (RAM) 8
3 is connected. ROM82 has built-in programs etc. to control the operation of the entire sewing machine, and RAM83
Sewing data consisting of counts during sewing operation, feed pitch, etc. is stored in .

The CPU 81 also has the three needle feed selection keys, the normal feed selection key 40, .
A needle feed potentiometer 36, a normal feed potentiometer 38, a needle feed drive timing generator 45, and a normal feed drive timing generator 46 are connected to each other, and various signals from these are input to the CPLJ 81. . Further, the CP and U 81 are connected to ship record feeding drive motors 59, 60, . The electromagnetic clutch 41 and the solenoid 92 are connected to each other, and the CPU 81 outputs a drive signal to them.

When the CPU 81 inputs a needle feed mode setting signal based on the selection operation of the needle feed selection key 39, the CPU 81 controls the electromagnetic clutch 4 based on the signals from the needle feed potentiometer 36 and the needle feed drive timing generator 45.
1 is maintained in the connected state, and while the needle 9 is stuck into the work cloth W on the sewing machine bed 2, the feed drive motors 59 and 60 are driven to rotate the cloth feed rotary bodies 50 and 51, and the cloth is The workpiece cloth W is transferred by the cooperation of the rotation of the feed rotary bodies 50 and 51 and the rotation of the nail 9 in the cloth feeding direction. Further, when the CPU 81 inputs a setting signal for the normal feed mode based on the selection operation of the normal feed selection key 40, the CPU 81 controls the normal feed potentiometer 3.
8 and the normal feed drive timing generator 46, the electromagnetic clutch 41 is switched to the disconnected state and the solenoid is switched to the excited state.
9 is being handled upward from the workpiece cloth W, the feed drive motors 59 and 60 are driven to rotate the cloth feed rotary bodies 50 and 51, and the workpiece cloth is It is designed to transport W.

Next, the operation of the sewing machine configured as described above will be explained.

Now, when sewing the work cloth W with this sewing machine, select either the needle feed selection key 39 or the normal feed selection key 40 in the front of the sewing machine arm 3, and select the Select needle feed mode or normal feed mode. Also, if you select 81 feed remote, adjust the needle feed adjustment knob 34 to set the cloth feed for each stitch, and if you select the normal feed mode, set the cloth feed for each stitch. The feed adjustment knob 37 is rotated to adjust the cloth feed position for each stitch in normal feed.

After that, by pressing the foot pedal (not shown), etc.
The sewing machine motor is started and sewing begins,
As mentioned above, in the selected state of the needle feed mode, the second
Since the electromagnetic clutch 41 (not shown) is maintained in the connected state, as the sewing machine main shaft 4 rotates, the first motion conversion mechanism 11
The needle bar 8 is moved up and down via the sewing machine, and while the needle 9 is stuck into the work cloth on the sewing machine bed 2, the needle bar 8 is rotated to the cloth feeding side via the second movement conversion mechanism 16. Ru. Further, when this needle feeding mode is selected, the needle feeding potentiometer 36 and the needle feeding timing generator 4 are activated.
The signal from 5 is input to the CPU 81, and the needle 9 moves to the workpiece cloth W.
While the fabric is stuck in the cloth, a drive signal is output from the CPU 81 to the feed drive motors 59 and 60, and the motors 59 and 60 are driven to intermittently rotate the cloth feed rotary body 50 and 51. Therefore, due to the cooperation between the rotation of the cloth feed rotors 50 and 51 and the rotation of the needle 9 toward the cloth feed side, the workpiece cloth W can be transferred by a predetermined amount and a predetermined sewing can be performed.

On the other hand, when the normal feed mode is selected, the electromagnetic clutch 41 is switched to the disconnected state and operated, the second motion conversion mechanism 16 is disabled, the solenoid 92 is energized, and the armature t93 is operated with one rotating wheel. Upper retaining hole 94
, and the needle bar 8 is fixed at the vibration center position. Therefore, the needle bar 8 is not reciprocated in the cloth feeding direction as the main shaft 4 of the sewing machine rotates, but is reciprocated only in the vertical direction via the first motion conversion mechanism 11. Also, when this normal feed mode is selected, the signals from the normal feed potentiometer 38 and the normal feed drive timing generator 46 are
The feed drive motor 59,
A drive signal is output to the motors 59.6 and 60.
0, the cloth feeding rotary bodies 50 and 51 are intermittently rotated. Therefore, the work cloth W is transferred by a predetermined amount ω by the rotating action of the cloth feed rotary body 50, 51, and a predetermined sewing can be performed.

It should be noted that the present invention is not limited to the configuration of the above-mentioned embodiments, and the configuration of each part can be arbitrarily changed and embodied without departing from the spirit of the invention.

Effects of the Invention - [As described in detail, the present invention has a normal feeding mode in which the cloth is fed only by the rotation of the cloth feeding rotary body, and a normal feeding mode in which the cloth is fed only by the rotation of the cloth feeding rotary body and the reciprocating rotation of the needle by the rotation of the cloth feeding rotary body. It is possible to perform sewing conveniently by easily switching to the needle feeding mode in which cloth is fed, and the configuration for this purpose is extremely simple, which is an excellent effect.

[Brief explanation of drawings]

Fig. 1 is a perspective view of a sewing machine embodying the present invention, and Fig. 2 shows first and second needle bars for vertically moving and reciprocatingly rotating the needle bar.
FIG. 3 is a partial sectional view showing an enlarged part of the second motion converting mechanism; FIG. 4 is a partial plan view of the sewing machine bed showing the structure of the cloth feeding rotary body; FIG. 5 is a partial sectional view taken along the line A--A in FIG. 4, FIG. 6 is a partial perspective view showing the feed drive timing generator, and FIG. 7 is a control circuit diagram of this sewing machine. 2... Sewing machine bed, 4... Sewing machine main shaft, 8...
Needle bar, 9... Needle, 10... Thread ring catcher, 11...
1st motion conversion mechanism, 39...needle feed selection key constituting the switching means, 40...normal feed selection key constituting the switching means, 41...electromagnetic clutch constituting the reciprocating rotation disabling mechanism; 48.49... cloth presser foot, 50.51.
... Cloth feeding rotary body, 59.60... Drive motor for feeding.

Claims (1)

[Claims] 1. It has a needle (9) at the lower end, is movable up and down, and reciprocates along the cloth feeding direction centered on one axis perpendicular to the cloth feeding direction above the sewing machine bed (2). a rotatable needle bar (8); and a needle (
a thread loop catcher (10) for forming stitches on the work cloth (W) in cooperation with the work cloth (W);
) is provided between the sewing machine main shaft (4) and the needle bar (8),
a first motion conversion mechanism (11) that converts the rotational movement of the sewing machine main shaft (4) into the vertical movement of the needle bar (8); and a first motion conversion mechanism (11) provided between the sewing machine main shaft (4) and the needle bar (8);
a second motion conversion mechanism (16) that converts the rotational movement of the sewing machine main shaft (4) into the reciprocating rotation of the needle bar (8);
a reciprocating rotation disabling mechanism (41) that prevents the reciprocating rotation of cloth feeding rotors (50, 51) that are rotated to transport the work cloth (W); and the reciprocating rotation disabling mechanism (41).
) is activated, and the needle (9) is placed on the sewing machine bed (2).
), a normal feeding mode in which the cloth feed rotary body (50, 51) is rotated by the drive motor (59, 60) when the workpiece cloth (W) on the cloth (W) is pulled upward, and a reciprocating rotation disabling mechanism (41
) is stopped, and it is possible to switch to a needle feeding mode in which the cloth feeding rotary body (50, 51) is rotated by the drive motor (59, 60) while the needle (9) is stuck into the workpiece cloth (W). A sewing machine characterized in that it is provided with switching means (39, 40).