JPH0771595B2 - sewing machine - Google Patents

Description

The present invention relates to a sewing machine, and more particularly to a cloth feeding device for the sewing machine.

(Prior Art) In a conventional sewing machine, generally, a feed dog connected to a sewing machine spindle is provided on a sewing machine bed, and the feed teeth are interlocked by four feeds according to the rotation of the sewing machine spindle, so that the work cloth on the sewing machine bed is It is designed to be transferred intermittently.

(Problems to be Solved by the Invention) However, in the sewing machine having the conventional configuration, as the operating speed of the sewing machine, that is, the rotation speed of the sewing machine spindle changes, the operating locus of the feed dog changes and the expansion and contraction degree of the work cloth changes. Therefore, there is a problem that a required feed is not applied to the work cloth and uniform stitches corresponding to a preset cloth feed amount cannot be formed. That is, since the main shaft of the sewing machine and the feed dog are connected via various mechanical parts, for example, when the sewing machine is operated at a high speed, the responsiveness of the parts deteriorates due to the inertia of each part, and the feed for each stitch is increased. There was a problem that the pitch became longer than the set pitch.

Further, since the feed dog operates in conjunction with the main shaft of the sewing machine, in order to change the feed amount for each stitch to enable gathering, for example, a complicated feed amount adjusting mechanism is required. Was needed.

Configuration of the Invention (Means for Solving the Problems) The present invention has been made by paying attention to the problems as described above, and a needle 9 that is moved up and down with the rotation of the sewing machine main shaft 4, A thread catcher 10 for forming a stitch on the work cloth W in cooperation with the needle 9, and a drive motor 59, 60 arranged on the sewing machine bed 2 at least on both sides of the needle 9.
A pair of cloth feed rotary bodies 50, 51 which are intermittently rotated in the cloth feed direction by the above, cloth pressers 48, 49 for pressing the work cloth W onto the cloth feed rotary bodies 50, 51 from above, and one needle The feed amount setting means 34, 37 for setting the cloth feed amount for each of the above, and the drive so that the cloth feed rotating bodies 50, 51 are rotated by an amount according to the set value by the setting means 34, 37. In the sewing machine provided with a control means 81 for driving and controlling the motors 59, 60, at least the sewing machine bed 2 is provided with at least the cloth feed rotary bodies 50, 51.
Rollers 52, 53, 54, 55 respectively provided on the cloth feeding side and cloth feeding side of the needle drop position above, and belts stretched between the rollers and extending in the cloth feeding direction on the sewing machine bed 2. 56 and each of the rollers 52, 53,
Of the rollers 54, 55, at least upper rollers 52, 53 along the surface of the sewing machine bed are supported so as to be vertically movable, and vertically moving means 65, 66 for vertically moving the rollers 52, 53, respectively. 67 and 68 are provided, and an up-and-down position adjusting means 71 for changing and adjusting the up-and-down amount of each of the vertically moved rollers 52 and 53 is provided.

(Operation) Therefore, in the sewing machine of the present invention, the cloth feed amount is preset for the work cloth W by the intermittent rotation of the cloth feed rotors 50 and 51 regardless of the change in the rotation speed of the sewing machine spindle 4. The feed can be imparted to form uniform stitches without unevenness, and the feed amount for each stitch can be adjusted without requiring a complicated mechanism.

Further, in the present invention, the cloth feed rotary members 50, 51 are provided at least on the cloth feed side and the cloth feed side with respect to the needle drop position on the sewing machine bed 2, respectively.
The sewing machine bed 2 is stretched between 4,55 and those rollers.
It is composed of a belt 56 extending above in the cloth feeding direction.
The vertical movement means 65, 66, 67, 68 are the vertical position adjustment means 71.
Based on the position set by, the plurality of upper rollers 52, 53 along at least the surface of the sewing machine bed 2 are individually moved up and down. Therefore, by appropriately adjusting the vertical positions of the rollers 52 and 53 with respect to the sewing machine bed 2, for example, by changing the height positions of the left and right rollers with the needle 9 interposed therebetween, it is possible to easily perform curve sewing and also to perform needle stitching. The puckering phenomenon can be reliably prevented by setting the roller on the cloth feeding side with respect to the dropping position to a position higher than the roller on the cloth feeding side.

(Embodiment) Hereinafter, the present invention will be described in detail based on an embodiment in which the invention is embodied in a sewing machine that is used for both needle feeding and normal feeding.

In the sewing machine of this embodiment, as shown in FIGS. 1 and 2, the sewing machine frame 1 is composed of the sewing machine bed 2 and the sewing machine arm 3. A sewing machine spindle 4 is rotatably supported in the sewing machine arm 3, and a pulley 5 is provided at its right end.
Is installed. Then, as the sewing machine motor (not shown) rotates, the sewing machine main shaft 4 passes through the belt and the pulley 5.
Is rotated in the direction of the arrow in FIG.

As shown in FIG. 2, in 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 one horizontal axis orthogonal to the cloth feed direction.
A needle bar 8 is supported on the needle bar support frame 6 so as to be vertically movable, and a needle 9 is attached to the lower end of the needle bar 8. The needle bar 8 is reciprocally rotated along the cloth feed direction as the needle bar support frame 6 swings. As shown in FIG. 1, a thread catcher 10 is arranged in the sewing machine bed 2, is operated in accordance with the rotation of the sewing machine main shaft 4, and cooperates with the needle 9 to work cloth W on the sewing machine bed 2. It is designed to form a seam.

A first interlocking conversion mechanism is provided between the sewing machine main shaft 4 and the needle bar 8.
11 is provided so that the rotational movement of the sewing machine main shaft 4 is converted into vertical movement of the needle bar 8 and transmitted. That is, as shown in FIG. 2, the needle bar crank is located at the left end of the sewing machine main shaft 4.
12 is fixed, the crank pin 13 on one side thereof and the needle bar 8
A crank rod 15 is provided between the upper needle bar holder 14 and the needle bar holder 14. The rotation of the needle bar crank 12 based on the rotation of the sewing machine main shaft 4 causes the crank rod 15 and the needle bar to be held.
The needle bar 8 can be moved up and down via 14.

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 reciprocating rotation of the needle bar 8 for transmission. . That is, as shown in FIGS. 2 and 3, an eccentric wheel 17 is fixed to the sewing machine main shaft 4, and an eccentric wheel holder 18 is supported on the eccentric wheel 17 in a hug state. A rotary shaft 19 is rotatably supported in the sewing machine arm 3 behind the sewing machine main shaft 4, and a rotary arm 20 is fixed to the right end of the rotary shaft 19. A connecting rod 21 is rotatably attached to the lower end of the rotating arm 20 in the rearward direction, and the eccentric wheel holder 18 is connected to the central portion thereof. Also, the rotating shaft 19
An oscillating arm 22 is fixed to the left end of the, and an oscillating shaft holder 24 that engages with an oscillating shaft 23 on the needle bar support frame 6 is rotatably attached to the lower end thereof.

A feed switching device 25 is rotatably supported in the sewing machine arm 3 above the front part of the sewing machine main shaft 4, and in the center of the rear surface of the sewing machine arm 3, there is a circumference around the connecting point of the rotating arm 20 and the connecting rod 21. A rocking groove 26 having the same circumferential shape as the above is formed, and an adjusting shaft 27 is extended on the right side. A pair of left and right corner pieces 28 are rotatably supported at the front end of the connecting rod 21, and a feed switching device is provided.
A swing groove 26 of 25 is swingably engaged. Then, the feed switching device 25 is rotated by the adjusting shaft 27, and the sliding groove 26
Is set to an arbitrary position as shown in FIG. 3,
When the sliding groove 26 deviates from the circumference around the connecting point of the rotating arm 20 and the connecting rod 21, the eccentric wheel on the sewing machine spindle 4
When the eccentric wheel holder 18 is moved up and down as the 17 rotates, the sliding groove
The connecting rod 21 is reciprocally moved in the front-rear direction according to the tilted state of 26, and the movement is performed via the rotating arm 20, the rotating shaft 19, the swinging arm 22, the swinging shaft holder 24, and the swinging shaft 23. Transmitted to the rod support frame 6,
The needle bar support frame 6 and the needle bar 8 are reciprocally rotated in the cloth feeding direction or the opposite direction. The reciprocating rotation timing of the needle bar 8 is set so that the needle bar 8 is rotated toward the cloth feeding side while at least the needle 9 is stuck into the work cloth W on the sewing machine bed 2. Also, the swing groove
When 26 is located on the circumference around the connecting point between the rotating arm 20 and the connecting rod 21, the connecting rod 21 only rotates about the connecting point, and the reciprocating motion in the front-rear direction is made. Not done

As shown in FIG. 2, a feed adjuster 29 is rotatably supported by a shaft 30 in the sewing machine arm 3 so as to correspond to the lower right end of the adjusting shaft 27, and has a side face substantially V-shaped at its front end. Engaging surface 31
Are formed. A rotary lever 32 is fixed to the right end of the adjusting shaft 27, and a connecting rod 33 is provided between the tip of the rotating lever 32 and the feed adjuster 29. Corresponding to the feed adjuster 29, on the front surface of the sewing machine arm 3, a needle feed adjusting knob 34 constituting a feed amount setting means for setting the cloth feed amount for each needle at the time of needle feed can be rotationally adjusted. The engaging surface 31 of the feed adjuster 29 is engaged with the rear end of the rotary shaft 35 by the spring force of a spring (not shown). And this adjustment knob 34
By rotating and adjusting the feed adjuster 29,
The feed switch 25 is set to an arbitrary position via the connecting rod 33, the rotating lever 32, and the adjusting shaft 27 to change the reciprocating rotation amount of the needle bar 8, that is, the needle feed amount from zero to a predetermined amount. It is like this.

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 the feed adjuster 29 is rotated by the turning operation of the feed adjuster knob 34, so that the needle feed amount is increased. When the setting is changed, a drive signal corresponding to the feed amount is output. As shown in FIG. 1, on the front side of the sewing machine arm 3 on the right side of the needle feed adjusting knob 34, a feed amount setting means for setting a cloth feed amount for each needle at the time of normal feed is normally constructed. A feed adjusting knob 37 is screwed so as to be rotationally adjustable. A normal feed potentiometer 38 is connected to the shaft end of the adjusting knob 37, and when the feed amount is changed by the turning operation of the adjusting knob 37, a drive signal corresponding to the feed amount is output. ing.

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 adjusting knobs 34, 37, and these selection keys 39, 40 are provided. The needle feed mode and the normal feed mode can be switched and set by selecting. In addition, as shown in FIG.
An electromagnetic clutch 41 constituting a reciprocating rotation disabling mechanism is provided on the rotating shaft 19 in the rotation shaft 16. When the normal feed selection key 40 is selected and operated, the electromagnetic clutch 41 operates to rotate. The rotation transmission of the shaft 19 is cut off, and the second motion conversion mechanism 16 is disabled. A solenoid 92 is attached to the sewing machine arm 3 in the vicinity of the rotary shaft 19. This solenoid 92 is the normal feed selection key
When the armature 93 is excited by the ON operation of 40 and protrudes, the armature 93 is fitted into the holding hole 94 on the rotary shaft 19, whereby the rotary shaft 19 and the swing arm 22 are positioned at the center position of the swing range of the needle bar 8. It is designed to be held at.

As shown in FIG. 8, a rotary disk 42 of a swing timing generator for feeding is fixed on the sewing machine main shaft 4, and two signal generating slits are provided at opposite positions on different circumferences thereof. 43 and 44 are formed. A needle feed drive timing generator 45 and a normal feed drive timing generator 46 are arranged in the sewing machine arm 3 so as to correspond to the slits 43, 44 on the rotary disc 42, and each of them comprises a light emitting element and a light receiving element. It is composed of photoelectric sensors. Whenever the needle 9 pierces the work cloth W as the sewing machine spindle 4 rotates, the needle feed drive timing generator 45 senses the outer slit 43 on the rotary disc 42 and outputs a timing signal.
Each time the needle 9 is pulled out upward from the work cloth W, the normal feed drive timing generator 46 senses the inner slit 44 on the rotary disc 42 and outputs a timing signal.

As shown in FIGS. 1 and 5, a presser bar 47 is provided on the sewing machine arm 3 at the rear of the needle bar 8 so as to be movable up and down, and cloth pressers 48, 49 consisting of a pair of left and right rollers are rotatable at the lower end thereof. Supported by. Then, a pressing spring (not shown) always applies downward pressure to the pressing rod 47, and the work cloth W is pressed against the bed surface by the cloth pressers 48, 49, and the pressing bar 47 causes an electromagnetic solenoid or the like (not shown). The pressure of the work cloth W by the cloth pressers 48 and 49 is released when the work cloth W is lifted by the lifting mechanism including.

As shown in FIGS. 1, 4 and 5, a pair of cloth feed rotary members 50 and 51 are arranged on the sewing machine bed 2 so as to correspond to the cloth pressers 48 and 49, respectively. ing. Each cloth feed rotating body
Reference numeral 50,51 is composed of four toothed rollers 52,53,54,55, a timing belt 56 stretched between the rollers 52 to 55, and a tension roller 57. The work cloth W is transferred from the opening 58 formed in the sewing machine bed 2 onto the bed surface. Drive motors 56 and 60 for feeding are connected to the toothed rollers 54 at the lower front of the cloth feed rotors 50 and 51, respectively, and the drive motors 59 and 60 move the cloth feed rotors 50 and 51 in the cloth feed direction. It is designed to rotate intermittently.

Further, in this embodiment, as shown in FIGS. 4, 6, and 7, the toothed rollers 52, 53 on the upper front side and the upper rear side of the respective feed rotary bodies 50, 51 are provided with the support plate 61 and the support shaft 62 therebetween. Is supported by the sewing machine bed 2 so that the position can be changed in the vertical direction.
A cam follower 64 is rotatably supported at the lower end of the through a mounting plate 63. Corresponding to the toothed rollers 52, 53, four feed up / down motors 65, 66, 67, 68 constituting up-and-down moving means are arranged in the sewing machine bed 2, and the cam followers 64 are arranged on their motor shafts. An eccentric cam 69 that engages with is fixed. A spring 70 is provided on each support shaft 62, and urges the toothed rollers 52, 53 downward to press the cam follower 64 against the eccentric cam 69. Then, the vertical positions of the toothed rollers 52, 53 of the cloth feed rotary bodies 50, 51 are changed individually according to the turning position of the biasing cam 69 based on the drive of the feed vertical motors 65 to 68. It has become so.

On the other hand, as shown in FIG. 1, the feed adjusting knobs 34, 3 are provided.
A vertical position adjusting device 71, which constitutes a vertical position adjusting means, is provided on the front surface of the sewing machine arm 3 above 7, and four adjusting knobs 72, 73, 74, 75 are rotatably arranged on the front surface. Has been done. Potentiometers 76, 77, 78, 79 for feeding up and down are connected to the shaft end of each adjustment knob 72 to 75,
By rotating each adjustment knob 72, 75, each toothed roller 52,
When the vertical position of 53 is set, a drive signal for driving the feed vertical motors 65 to 68 is output according to the set amount.

Next, the control circuit for the sewing machine configured as described above is
It will be described with reference to the drawing.

A central processing unit (CPU) 81, which constitutes the control means in this control circuit, has a read-only memory (ROM) 82.
And a random access memory (RAM) 83 is connected. The ROM 82 contains a program for controlling the operation of the entire sewing machine, and the RAM 83 stores sewing data such as the number of stitches during the sewing operation and the feed pitch.

Further, the CPU 81 via the input interface 84, the needle feed selection key 39, the normal feed selection key 40, the needle feed potentiometer 36, the normal feed potentiometer 38, the needle feed drive timing generator 45, the normal feed drive timing The generator 46 and the feed up / down potentiometers 76 to 79 are connected to each other, and various signals from them are input to the CPU 81. Further, the CPU 81 is connected to the feed drive motors 59 and 60, the electromagnetic clutch 41 and the feed up / down motors 65 to 68, and the solenoid 92 via the output interface 85 and the drive circuits 86 to 92 and 95, respectively. On the other hand, a drive signal is output from the CPU 81.

Then, the CPU 81, when the needle feed mode setting signal based on the selection operation of the needle feed selection key 39 is input, based on the signals of the needle feed potentiometer 36 and the needle feed drive timing generator 45, the electromagnetic clutch 41. While maintaining the connected state, while the needle 9 is stuck into the work cloth W from above 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 feed is performed. The work cloth W is transferred by the cooperation of the rotation of the rotating bodies 50 and 51 and the rotation of the needle 9 in the cloth feeding direction. or,
When the CPU 81 inputs a normal feed mode setting signal based on the selection operation of the normal feed selection key 40, the normal feed potentiometer 38 and the normal feed drive timing generator
Based on the signal from 46, the electromagnetic clutch 41 is disengaged,
While the solenoid 92 is switched to the excited state, the feed drive motors 59 and 60 are driven to rotate the cloth feed rotary bodies 50 and 51 while the needle 9 is being pulled out upward from the work cloth W. The work cloth W is transferred by the rotating action of the cloth feed rotating bodies 50 and 51.

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

When sewing the work cloth W in this sewing machine, first, the vertical position adjusting device is provided on the front surface of the sewing machine arm 3.
When the adjustment knobs 72 to 75 of 71 are rotationally adjusted, the feed up / down potentiometers 76 to 79 change from the CPU8 to CPU8 depending on the adjustment amount.
Signal is input to 1. As a result, a drive signal corresponding to the adjustment amount of the adjustment knobs 72 to 75 is output from the CPU 81 to each of the feed up / down motors 65 to 68, and each of them is rotated via the eccentric cam 69 or the like as the motors 65 to 68 rotate. The upper toothed rollers 52, 53 of the cloth feed rotating bodies 50, 51 are moved up and down and set and arranged at a predetermined height position.

Next, either one of the needle feed selection key 39 and the normal feed selection key 40 on the front surface of the sewing machine arm 3 is selected and operated, and the needle feed mode or the normal feed mode is selected according to the type of sewing. Further, when the needle feed mode is selected, the needle feed adjusting knob 34 is rotationally adjusted to set the cloth feed amount for each needle in the needle feed, and the normal feeding adjusting knob 37 is rotationally adjusted. Set the cloth feed amount for each stitch in normal feed.

After that, by pressing the foot pedal (not shown),
The sewing machine motor is started to start sewing.
When the needle feed mode is selected as described above, the second
Since the electromagnetic clutch 41 shown in the figure is maintained in the connected state, the needle bar 8 is moved up and down via the first interlocking conversion mechanism 11 as the sewing machine spindle 4 rotates, and the needle 9 is placed on the sewing machine bed 2. While piercing the work cloth, the needle bar 8 is rotated to the cloth delivery side via the second interlocking conversion mechanism 16.
Further, when the needle feed mode is selected, signals from the needle feed potentiometer 36 and the needle feed drive timing generator 45 are input to the CPU 81, and while the needle 9 is piercing the work cloth W, the CPU 81 feed drive. A drive signal is output to the motors 59 and 60, and the cloth feeding rotary bodies 50 and 51 are intermittently rotated by driving the motors 59 and 60. Therefore, the work cloth W is transferred by a predetermined amount by the cooperation of the rotation of the cloth feed rotary members 50 and 51 and the rotation of the needle 9 toward the cloth feed side, and the predetermined sewing can be performed.

On the other hand, when the normal feed mode is selected, the electromagnetic clutch 41 is switched to the disengaged state, and the second motion conversion mechanism is activated.
16 is invalidated, the solenoid 92 is excited, the armature 93 is fitted into the holding hole 94 on the rotary shaft 19, and the needle bar 8
Is fixed at the swing center position. Therefore, the needle bar 8 is reciprocated only in the vertical direction via the first motion converting mechanism 11 without being reciprocally rotated in the cloth feed direction in accordance with the rotation of the sewing machine main shaft 4. When the normal feed mode is selected, the signals from the normal feed potentiometer 38 and the normal feed drive timing generator 46 are input to the CPU 81, and the CPU 81 outputs the signals while the needle 9 is being pulled out of the work cloth W. Drive signals are output to the feed drive motors 59 and 60, and the cloth feed rotors 50 and 51 are intermittently rotated by the drive of these motors 59 and 60. Therefore, the work cloth W is transferred by a predetermined amount by the rotating action of the cloth feed rotary members 50 and 51, and a predetermined sewing can be performed.

Further, in the sewing machine of this embodiment, the vertical position adjusting device
Since the upper and lower positions of the upper toothed rollers 52, 53 of the cloth feed rotary body 50, 51 can be arbitrarily changed and adjusted by 71, for example, the upper toothed roller 5 of the left cloth feed rotary body 50 can be adjusted.
By setting 2,53 to a position higher than the upper toothed rollers 52,53 of the right side cloth feed rotary body 51, the cloth feed action of the left side cloth feed rotary body 50 is higher than that of the right side cloth feed rotary body 51. Since it is effectively given to W, the curve sewing to the right rear can be easily performed, and conversely, the upper toothed rollers 52, 53 of the right cloth feed rotary body 51 are connected to the left cloth feed rotary body 50. If it is set to a position higher than the upper toothed rollers 52, 53, it is possible to easily perform curve sewing to the left rear.

Further, when puckering occurs due to the type of the work cloth W, etc., the rear toothed roller 53 for both cloth feed rotary members 50, 51.
Is set to a position higher than the front toothed roller 52, the cloth feeding action of both cloth feeding rotary members 50, 51 is effectively applied to the work cloth W toward the rear side in the cloth feeding direction, and the puckering phenomenon is ensured. Can be prevented.

Further, in this sewing machine, the cloth feed rotary members 50, 51 are operated by the rotation of the drive motors 59, 60, and the sewing machine main shaft 4
Since there is no mechanical relationship with the main shaft 4, there is no mechanical part between the main shaft 4 and the main shaft 4, and therefore an accurate cloth feed amount can always be obtained without being affected by inertia or the like. Further, the cloth feed amount in the cloth feed rotary bodies 50 and 51 can be easily changed by operating the adjusting knob 37, and gathering and the like can be dealt with freely.

The present invention is not limited to the configuration of the above-described embodiment, and the configuration of each part can be arbitrarily modified and embodied without departing from the spirit of the present invention.

Effect of the Invention As described in detail above, according to the present invention, regardless of the change in the rotation speed of the sewing machine spindle, the intermittent rotation of the cloth feed rotary member imparts the feed corresponding to the preset cloth feed amount to the work cloth. It is possible to form even stitches without unevenness, and to adjust the feed amount for each needle without requiring a complicated mechanism. Moreover, the vertical position of each roller of the cloth feed rotary body can be adjusted appropriately. By changing and adjusting, curve sewing can be easily performed and puckering can be prevented. It has an excellent effect.

[Brief description of drawings]

FIG. 1 is a perspective view of a sewing machine that embodies the present invention, and FIG. 2 is first and second views for vertically moving and reciprocally rotating a needle bar.
FIG. 3 is a partial perspective view showing a motion converting mechanism, FIG. 3 is a partial sectional view showing a part of the second motion converting mechanism in an enlarged manner, and FIG. 4 is a partial plan view of a sewing machine bed showing a structure of a cloth feed rotating body. 5 is a partial cross-sectional view taken along the line AA in FIG. 4, FIG. 6 is a partial cross-sectional view showing the vertical movement structure of the upper toothed roller of each cloth feeding rotary member, and FIG. 7 is a B- of FIG. FIG. 8 is a partial sectional view taken along line B, FIG. 8 is a partial perspective view showing a drive timing generator for feed, and FIG. 9 is a control circuit diagram of this sewing machine. 2 ... Sewing machine bed, 4 ... Sewing machine spindle, 9 ... Needle, 10
...... Thread loop catcher, 34 ...... Needle feed adjustment knob that constitutes the feed amount setting means, 37 ...... Normal feed adjustment knob that constitutes the feed amount setting means, 48, 49 ...... Presser foot, 50, 51 ...... Cloth feed rotary body, 52,53,54,55 …… Toothed roller as roller, 56 …… Timing belt as belt, 59,60…
... Feeding drive motor, 65,66,67,68 ... Feed up / down motor constituting up / down moving means, 71 ... Up / down position adjusting device constituting up / down position adjusting means, 81 ... constituting control means
CPU.

Claims (1)

[Claims] 1. A needle (9) which is moved up and down with the rotation of a sewing machine spindle (4), and a thread for forming a stitch on a work cloth (W) in cooperation with the needle (9). The wheel catcher (10) and a pair of cloth feed rotations arranged on the sewing machine bed (2) at least on both sides of the needle (9) and intermittently rotated in the cloth feed direction by the drive motors (59, 60). Body (5
0,51) and the work cloth (W) from above the cloth feed rotary body (50,5).
1) The presser foot (48,49) to be pressed upward, the feed amount setting means (34,37) for setting the cloth feed amount for each stitch, and the set value by the setting means (34,37) And a control means (81) for driving and controlling the drive motor (59, 60) so that the cloth feed rotating body (50, 51) is rotated by a corresponding amount. Rollers (52, 53, 5) provided on the body (50, 51) at least on the cloth feeding side and the cloth feeding side with respect to the needle drop position on the sewing machine bed (2).
4,55) and a belt (56) stretched between the rollers and extending in the cloth feed direction on the sewing machine bed (2), among the rollers (52,53,54,55). A plurality of upper rollers (52,5) at least along the plane of the sewing machine bed (2)
Vertically moving means (65, 53) for vertically moving each roller (52, 53) while supporting the respective 3) vertically movable.
66, 67, 68) and, further, vertical position adjusting means (71) for changing and stretching the respective vertical movements of the respective rollers (52, 53) that are moved up and down. sewing machine.