JPS61272084A - Controller of sewing machine - Google Patents

Abstract

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

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Application Field) The present invention provides a seam forming device that includes a needle that is moved up and down through a work cloth on a work cloth support surface and forms a seam in the work cloth. and a work cloth feeding device that feeds the work cloth on the work cloth support surface.

(Prior art and problems to be solved by the invention) Conventionally,
When sewing pocket pieces, etc. onto fabric, the sewing machine is stopped at the desired sewing stop position for each corner of the pocket piece, and the distance between the sewing stop position and the end of the workpiece fabric, that is, the sewing In order to obtain the desired amount of allowance, the number of stitches from the time when the edge of the workpiece cloth is eaten until the end of sewing is memorized and set during trial sewing work, and the regeneration sewing work is performed according to the set number of stitches. There is a sewing machine that looks like this.

However, with this conventional sewing machine, even if the number of stitches set during trial sewing is changed depending on the type of fabric, etc. during regeneration sewing, the changed number of stitches and tip will not be changed during regeneration sewing. The problem is that sewing according to the difference between the number of stitches and the number of stitches set cannot be executed immediately after changing the number of stitches, and it is necessary to regenerate the line again in order to sew according to the changed number of stitches. was there.

(Object of the invention) This invention was made in view of the above circumstances, and
The purpose is to be able to perform sewing based on the difference between the two variables immediately after the completion of sewing based on a preset variable such as the number of stitches, and when that variable is changed and set.
An object of the present invention is to provide a control device for a sewing machine that can perform desired sewing in a short time.

(Means and operations for solving the problem) In order to achieve the above object, the present invention includes a needle that is moved up and down through the work cloth on the work cloth support surface, and the needle is sewn into the work cloth. A seam forming device that forms stitches, a work cloth feed device that applies feed to the work cloth on the work cloth support surface, and a seam forming device that applies feed to the work cloth on the work cloth support surface, and a seam forming device that applies feed to the work cloth on the work cloth support surface, and a seam forming device that applies feed to the work cloth on the work cloth support surface, and a seam forming device that applies feed to the work cloth on the work cloth support surface; a setting means for setting variables related to sewing such as a seam allowance, a changing means for changing and setting variables preset by the setting means, and forming the seam based on the preset variables. In addition to controlling the operation of the device and the workpiece cloth feeding device, when the change is changed and set by the changing means at the end of sewing based on the variable, immediately after that, the sewing is performed based on the difference between both variables. A control means for controlling the operations of the mesh forming device and the work cloth feeding device is provided.

Therefore, at the end of sewing based on a variable such as the number of stitches set in advance, when that variable is changed and set, immediately thereafter sewing is performed based on the difference between the two variables.

(Example) Hereinafter, an example embodying the present invention will be described in detail with reference to the drawings. As shown in FIGS. 1 and 4, a sewing machine main shaft 2 is rotatably supported within an arm portion la of a sewing machine frame 1, and a pulley 3 is attached to the right end thereof. Further, a needle bar 4 is supported by the arm portion 1a so as to be movable up and down, and a needle 5 is attached to the lower end of the needle bar 4. As the motor 6, which is disposed below the bed section 1b of the sewing machine frame 1, rotates, the main shaft 2 of the sewing machine is rotated via the pulley 7 on the motor shaft, the belt 8, and the pulley 3. The needle 5 passes through the work cloth W on the work cloth support surface of the bed portion 1b and is moved up and down, and lockstitches the work cloth W in cooperation with a thread loop catcher (not shown) provided in the bed portion 1b. A seam is formed.

Further, a needle position detector 9 for outputting a synchronization signal and detecting the up position and the needle down position is installed in the arm part la so as to face the pulley 3 on the sewing machine main shaft 2. . At the rear of the needle bar 4, the arm portion 1
A presser bar 11 having a presser foot 10 at its lower end is supported in a vertically movable manner.

As shown in FIG. 4, a horizontal feed shaft 12 and a vertical feed shaft 13 are rotatably supported within the bed portion lb. 'A feed table 14 is rotatably supported by a support arm 15 on the horizontal feed shaft 12, and a bed portion 1b is mounted on the upper surface of the feed table 14.
A retractable feed dog 16 is mounted on the work cloth support surface of the machine. a bifurcated arm 17 attached to the vertical feed shaft 13;
is engaged with the engaging portion 14a of the feed base 14.

A vertical feed eccentric cam (not shown) is mounted on the sewing machine main shaft 2, and as the vertical feed eccentric cam rotates, the crank vertical feed 18. A vertical feed motion is applied to the feed dog 16 via the vertical feed shaft 13, the two-pronged arm 17, and the like. In addition, an eccentric cam (not shown) for horizontal feeding is mounted on the main shaft 2 of the sewing machine, and the horizontal feeding shaft 12 is rotatable about a support shaft 19 to change the direction and amount of cloth feeding. A feed switching device 20 is connected at the rear thereof, and as the horizontal feed eccentric cam rotates, the crank rod 21. A horizontal feed movement synchronized with the vertical feed movement is applied to the feed dog 16 via the feed switching device 20° horizontal feed shaft 12 and feed base 14. The feed dog 16 cooperates with the presser foot 10 to feed the work cloth W.

As shown in Figure 4.5, the arm part a of the sewing machine frame 1
Inside, a feed adjustment member 25 is rotatably supported approximately at the center by a support shaft 26, and a feed control cam 27 having a roughly V-shaped side surface is formed on the front side thereof. Feed adjustment member 2
A connecting rod 28 is rotatably attached at the upper end to the rear side of 5 with a screw 29, and the lower end thereof is connected to the feed switching device 2.
0 for rotation. Further, the feed adjustment member 25 is biased to rotate clockwise in FIG. 5 by a spring (not shown).

As shown in FIG. 5, in front of the feed adjustment member 25, an operating member 30 is attached to the arm portion 1a at its intermediate threaded portion 3.
1 is rotatably screwed together, and its inner end engages with the feed control cam 27 of the feed adjustment member 25 to regulate and hold the feed adjustment member 25 at a predetermined position against the action of the spring. An engaging portion 32 is provided for the operation, and an operation dial 33 is provided at the outer end. By rotating the operation dial 33 and moving the operation member 30 in the front-back direction, the inclination angle of the feed adjustment member 25 is changed through the engagement between the engagement portion 32 and the feed control cam 27. Accordingly, by changing the rotation angle of the feed switching device 20, the amount of cloth feed by the feed dog 16 is changed and set.

As shown in FIG. 4, an operating shaft 34 extending left and right is rotatably supported in the arm portion a above the feed switching device 20, and its right end protrudes outward to the right side of the arm 1a. . An operating arm 35 is fixed to the left end of the operating shaft 34, and its rear end is rotatably connected to the intermediate portion of the connecting rod 28. When the cloth feed amount is changed and set by the feed adjusting member 25, the operating shaft 34 is rotated to a position corresponding to the cloth feed amount via the connecting rod 28 and the actuating arm 35.

A servo solenoid 38 is disposed within the arm portion a behind the operating shaft 34, and the front end of the armature 39 is operatively connected to the operating shaft 34 via a connecting body 40 and a pin 41. When the armature 39 is moved forward by the operation of the servo solenoid 38 and the operating shaft 34 is rotated by a predetermined amount clockwise in FIG. vessel 20
is rotated in the direction of decreasing the cloth feed amount, so that the cloth feed amount is reduced.

Further, as shown in FIG. 4, a potentiometer 42 for detecting the feed amount is mounted on the right outer surface of the arm portion 1a in correspondence with the right end protrusion of the operating shaft 34, and a potentiometer 42 for detecting the feed amount is mounted on the right outer surface of the arm portion 1a. A predetermined detection signal is output depending on the amount of rotation. A transmission member 44 for transmitting the rotational movement of the operating shaft 34 to the rotating shaft 43 is disposed between the right end protrusion of the operating shaft 34 and the rotating shaft 43.

As shown in FIGS. 1 and 2, in the vicinity of the needle 5, a light emitting element 45 and a light receiving element 46 are arranged facing each other on the arm part 1a and the bed part 1b. And pixel element 4
5.46 constitutes a cloth edge detection sensor 47, and during sewing operation, the end of the workpiece cloth W is detected by the "pixel element 45.4".
6, the right end detection sensor 47 outputs a detection signal.

Next, the electrical configuration of the sewing machine of this embodiment will be explained. As shown in FIGS. 1 and 3, the arm portion 1
An operation panel 50 is disposed on the front side of a, and the panel 5
0 is a memory key 51. Heavy sensing key 52. Memorized key 53. Play key 54, pattern designation key 55. Stitch number key 56. Seam allowance key 57 which also serves as thread trimming number key. Production quantity key 58, clear key 59. Addition keys 60a, 60b
and a subtraction key 61. In addition, on each key except the addition and subtraction keys 60a, 60b, and 61, there is a light emitting diode D for monitoring that blinks when the key is operated.
is installed. Furthermore, a display unit 62 is provided on the operation panel 50 to display the seam allowance l, the distance between the fabric edge detection sensor 47 and the needle drop position, the fabric feed amount (feed repitch), the number of sheets produced, etc. has been done.

Now, a foot pedal 64 is connected to the central processing unit (CPU) 63 shown in FIG.
The motor 6 is driven and controlled via the motor 5. A detection signal output from the cloth edge detection sensor 47 is input to the CPU 63 via an amplifier circuit 66. Further, the potentiometer 42 outputs a signal corresponding to the amount of rotation of the operating shaft 34 shown in FIG. 4, and the output signal is input to the CPU 63 via the A/D converter 82.

The CPU 63 operates a thread cutting solenoid 67 for operating a thread cutting device (not shown) at the end of sewing.
, an operating signal is outputted via a load drive circuit 69 to a cloth presser solenoid 68 for vertically moving the presser foot IO. Furthermore, the CPU 63 outputs an actuation signal to the servo solenoid 38 via the position control circuit 7o.

The CPU 63 has a read-only memory (ROM)
71 and a random access memory (RAM) 72 are connected to each other, and the ROM 71 stores a program for controlling the operation of the entire sewing machine and cloth feed amount data corresponding to the output signal from the potentiometer 42. On the other hand, as shown in FIGS. 7(a) to (C), the RAM 72 has a general-purpose working area 73. A pattern working area 74 and four memory areas 75 corresponding to pattern numbers on the pattern designation key 55 are provided.

A memory counter 76 is provided in the general-purpose working area 73.
, the cloth feed amount detected by the potentiometer 42 (
A feed pitch data storage area 77 for storing the feed pitch (feed pitch), the feed amount of the work cloth W from the detection of the fabric edge to the next needle drop position, and the feed pitch stored in the feed pitch data storage area 77; A phase counter 78 for storing the ratio, that is, the phase. Stitch number counter 79. Register 80. A sensor needle drop distance data storage area 81 and the like are provided for storing the distance L (see FIG. 2) from the cloth edge detection position by the cloth edge detection sensor 47 to the needle drop position. Further, in the pattern working area 74 and each of the memory areas 75, the solenoids 38, 67. Data representing operating conditions such as 68 and seam allowance data l are stored.

The feed amount of the workpiece cloth from the time the fabric edge is detected to the next needle drop position is determined based on the cloth feed amount data stored in the ROM 71, the synchronization signal output from the needle position detector 9, and the needle down position detection signal. Calculated based on.

Next, the operation of the sewing machine configured as described above will be explained. Each memory area 75 of the RAM 71 shown in FIG. 7(a)
For example, by performing memory sewing in which a home base type pocket cloth piece is sewn onto the work cloth W with the memory mode set by operating the memory key 51, each edge of the pocket cloth piece can be sewn. Seam allowance data corresponding to ! and data representing various operating conditions are stored in the memory area 7 of the RAM 72.
It is stored in 5.

Therefore, in order to perform recycled sewing work based on that data,
When the playback key 54 is operated, the determination result at step Sl in FIG. 8(a) becomes YES, and the playback mode is set. When any one of the pattern designation keys 55 is selected and operated when setting the playback mode, C
The PU 63 specifies the memory area 75 of the RAM 72 corresponding to that number.

Next, in step S2, when the foot pedal 64 is depressed, the process proceeds to step S3, and operation of the sewing machine based on the data stored in the designated memory area 75 is started. During operation of this sewing machine, the potentiometer 42 outputs a signal corresponding to the amount of rotation of the operating shaft 34 shown in FIG. The cloth feed amount data (feed pitch data) is stored in the general working area 73.
is stored in the feed pitch data storage area 77.

Next, in step S5, the CPU 63 reads out the set seam allowance l stored in the memory area 75. Then, the processes from step 83 to step S6 are repeated until a detection signal is output from the cloth edge detection sensor 47.

When the cloth edge detection signal is output, the CPU 6
3 is based on the data of the phase at the time of detecting the fabric edge (when passing the sensor), the previously detected fabric feed amount, the set seam allowance l, and the distance between the sensor needle drop positions, from the time the fabric edge is detected to the seam allowance. The number of stitches and cloth feed reduction rate are calculated, and the data is stored in the general-purpose working area 73.

Thereafter, when it is determined in step S8 that the sewing up to the set seam allowance l has been completed, the process proceeds to step S9 and the sewing machine is stopped. Then, set seam allowance in step S10!
is stored in the register 80 of the general-purpose working area 73, and the memory counter 76 is incremented in step Sll.

Next, in step S12, it is determined whether all the sewing corresponding to the sewing pattern has been completed, and in this case, since the sewing of only one edge of the pocket cloth has been completed, the result is No. The process then proceeds to step S1-3, where it is determined whether or not the seam allowance key 57 has been operated to change the seam allowance.

If the result is YES, the process advances to step S14, and the seam allowance data l in the register 80 is displayed on the display section 62. Thereafter, the memory counter 73 is decremented in step S15.

Subsequently, when the addition key 60a is operated in step S16, an addition process of O, 1m■ is executed to the seam allowance data l in step S17, and when the subtraction key 61 is operated in step 318, step In S19, a subtraction process of 0° 1 crane is executed for the seam allowance data l. Further, when the addition key 60b is operated in step S20, 0.
Addition processing for five cranes is executed.

Next, the memory counter 73 is incremented in step S22, and when the seam allowance key 57 is operated in step S23, the process advances to step S24. In step S24, the CPU 63 performs the steps 83 to S21.
The seam allowance data changed and the front filling register 80
The sewing machine is compared with the seam allowance data l inside, and the sewing machine is operated according to the difference.

If the seam allowance key 57 is operated again without depressing the foot pedal 64, the determination result in step S25 becomes No, and the result in step S13 becomes Y.
ES, and the seam allowance changing process from step 314 to step S24 can be repeated as described above.

If the determination result in step S25 is YES, the process returns to step S3 and steps 83 to S are performed.
Steps up to 11 are repeated, and the next edge of the pocket cloth piece is sewn. Then, the sewing for each edge of the pocket cloth is completed, and the determination result in step S12 is YES.
When S is reached, the memory counter 7 is set in step S26.
6 is completed.

On the other hand, if the determination result in step S13 is NO, in the next step S27, the display section 62 displays the number of times of sewing of the sewing pattern designated as described above, that is, the number of times of sewing of the workpiece cloth to which the pocket cloth piece is sewn. The production number is displayed, and then the process returns to step S25.

Furthermore, in a state where the normal mode is set without operating either the memory key 51 or the playback key 54, the determination result in step S1 becomes NO, and the display routine is executed. In this display routine, the third
Among the pattern designation keys 55 “1” to “4” shown in the figure,
When the "1" key 55 is operated, the determination result in step S30 becomes YES, and the distance between the cloth edge detection sensor 47 and the needle drop position is displayed on the display section 62 in step S31. If the determination result in step S30 is No, the process proceeds to step S32, and the pattern designation key 5 of "2"
5 is operated, the determination result becomes YES, and the cloth feed amount (feed pitch) is displayed in the next step S33.

If the determination result in step S32 is No, the process advances to step S34, and when the production quantity key 58 shown in FIG. 3 is operated, the determination result becomes YES and the process proceeds to step S34.
The production quantity is displayed at 35. If the determination result of the steering knob S34 is No, the process advances to step S36, and the display operation ends.

As mentioned above, in this embodiment, with key operation,
Since the accurate cloth feed amount based on the output signal from the potentiometer 42 is displayed, for example, when sewing with a specified sewing length and number of stitches, it is possible to measure the actual stitch dimensions and use the operation dial. There is no need to repeat the rotation operation 33 over and over again to adjust the amount of cloth feed.

Next, a second embodiment embodying the present invention will be described with reference to FIGS. 9 and 10(a) and (b).

This embodiment is different from the first embodiment in the structure of the pattern working area and memory area of the RAM. In the RAM memory area 90 of this embodiment, stitch count data is stored in place of the seam allowance data l in the first embodiment. That is, the memory area 9 of the RAM
0, by performing memory sewing, for example, sewing a pocket cloth piece to the work cloth W with the memory mode set by operating the memory key 51, sewing of each edge of the pocket cloth piece is performed. Corresponding stitch count data and data representing various operating conditions are stored.

Therefore, in order to perform recycled sewing work based on that data,
When the playback key 54 is operated, the determination result in step S50 of FIG. 10(a) becomes YES, and the playback mode is set. When any one of the pattern designation keys 55 is selected and operated when setting the playback mode, the CPU
63 is the RAM memory area 9 corresponding to that number.
Specify 0.

Next, in step S51, when the foot pedal 64 is depressed, the process proceeds to step S52, where the CPU 63
reads the number of stitches stored in the memory area 91 according to the memory counter 76 and stores it in the stitch number counter 79. Then, in step S53, operation of the sewing machine is started. When the needle position detector 9 shown in FIG. 1.6 outputs a needle down position detection signal as the sewing machine operates, the determination result in step S54 becomes YES, and step S
At 55, the number of stitches is subtracted by the stitch number counter 79. Next, in step S56, it is determined whether or not the stitch number counter 79 has reached zero, and the processes of steps 353 to 356 are repeated until the result becomes YES.

When the stitch number counter 79 reaches zero, the operation of the sewing machine is stopped in step S57, and in step S35
At step S8, the number of stitches executed during the sewing machine operation is stored in the register 80, and at step S59, the memory counter 76 is incremented.

Next, in step S60, it is determined whether all the sewing corresponding to the sewing pattern has been completed, and in this case, since the sewing of only one edge of the pocket cloth has been completed, the result is No. , proceed to step S62,
It is determined whether or not the stitch number key 56 has been operated to change the number of stitches. If the result is YES, step S
Proceeding to 63, the stitch count data in the register 80 is displayed on the display section 62, and the memory counter 73 is decremented.

Subsequently, when the addition key 60a is operated in step S64, 1 is added to the stitch count data in step S65.
When the addition process for the number of stitches is executed and the subtraction key 61 is operated in step S66, the subtraction process for one stitch is executed for the stitch number data in step S'67.

Next, in step 36B, the memory counter 73 is incremented, and the process proceeds to step S69. This step S6
At step 9, the CPU 63 compares the stitch number data changed in steps 364 to S67 with the stitch number data in the register 80, and operates the sewing machine according to the difference.

If the foot pedal 64 is not subsequently depressed, the determination result in step S70 becomes No, and the stitch number changing process from step 362 to step S69 can be repeated as described above.

If the determination result in step S70 is YES, the process returns to step 352, steps 552 to S59 are repeated, and the next edge of the pocket cloth is sewn. When the sewing on each edge of the pocket cloth is completed and the determination result in step S60 becomes YES, the memory counter 76 is cleared in step S61.

As mentioned above, in this embodiment, when the number of stitches stored in advance is changed, sewing is performed according to the changed number of stitches immediately after the change operation, so the optimum number of stitches for sewing can be determined. Can be set easily and reliably.

(Effects of the Invention) As described in detail above, the present invention provides a sewing machine based on the difference between the two variables immediately after the variable is changed and set at the end of sewing based on a variable such as the number of stitches set in advance. This provides an excellent effect in that desired sewing can be easily performed in a short time.

[Brief explanation of the drawing]

1 to 8 show a first embodiment embodying the present invention, in which FIG. 1 is a front view of the sewing machine, FIG. 2 is a partially enlarged side view, and FIG. 3 is a view of the operation panel. Partially enlarged front view,
Fig. 4 is a perspective view showing the feed mechanism, Fig. 5 is an enlarged side sectional view, Fig. 6 is an electric program circuit diagram, Fig. 7 (a)
is a configuration diagram of the RAM, FIG. 7(b) is a configuration diagram of the general-purpose working area, FIG. 7(C) is a configuration diagram of the pattern working area and memory area, and FIGS. 8(a) to (C) are flowcharts. It is. 9 and 10 show a second embodiment embodying the present invention, in which FIG. 9 is a configuration diagram of the memory area in the RAM, and FIGS. 10(a) and 10(b) are flowcharts. It is. In the figure, 51 is a memory key, 56 is a stitch number key, 57 is a seam allowance key, 5Qa, b are addition keys, 61 is a subtraction key, 6
3 is C P tJ constituting a control means, 71 is a ROM,
72 is a RAM (the above-mentioned 51.72 etc. constitute a setting means, the above-mentioned 56.57.60a, 60b, 61.72)
etc.). Patent applicant Brother Industries, Ltd. Agent
Patent Attorney On 1) Hirosen rl! JIiy Part 6 (c)

Claims (1)

[Scope of Claims] 1. A seam forming device that includes a needle (5) that is moved up and down through a work cloth (W) on a work cloth support surface and forms a seam in the work cloth (W). a work cloth feeding device that feeds the work cloth (W) on the work cloth support surface; and a work cloth feeding device that feeds the work cloth (W) on the work cloth support surface; Setting means (51, 72, etc.) for setting variables related to sewing; and changing means (56, 57, 60, etc.) for changing the variables preset by the setting means (51, 72, etc.).
a, 60b, 61, 72, etc.) and the operations of the stitch forming device and the work cloth feeding device are controlled based on preset variables, and at the end of sewing based on the variables, the variables are Changing means (56, 57, 60a,
60b, 61, 72, etc.), the control means (63) controls the operation of the stitch forming device and the work cloth feeding device based on the difference between the two variables immediately thereafter. A control device for a sewing machine.