JPS62120885A - Cloth presser raising and falling apparatus of playback 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] Purpose of the Invention (Field of Industrial Application) This invention makes it possible to perform regenerated sewing work based on sewing data related to sewing of a predetermined length that is stored along with trial sewing work. The present invention relates to a device for lifting and lowering a presser foot for pressing a workpiece cloth in a playback sewing machine.

(Problems to be Solved by the Invention) The present invention stores in advance the elevated position of the presser foot at a specific sewing area of the workpiece fabric during the trial sewing operation, thereby improving the position of the presser foot at the specific sewing area of the workpiece fabric during the recycled sewing operation. It is an object of the present invention to provide a presser foot lifting device for a playback sewing machine that can automatically arrange the presser foot at a predetermined raised position based on the stored information and can significantly improve work efficiency.

Structure of the Invention (Means for Solving the Problems) The present invention has been made by focusing on the above-mentioned problems. In a playback sewing machine, which is equipped with a storage means 53 for storing data and is capable of executing regenerated sewing work based on the stored LA data, a presser foot 4 is supported on a sewing machine frame 1 so as to be movable up and down; The driving means 18 for raising and lowering the presser foot 4, the setting means 35, 36 for setting the raised position of the presser foot 4 by the driving means 18, and the storage means 53 are set by the setting means 35, 36 during trial sewing work. The storage means 53 has a storage area for storing the raised position of the presser foot 4, and the presser foot 4 is arranged at the raised position corresponding to the information stored in the storage area of the storage means 53 during resewing work. A control means 51 for controlling the drive means 18 is provided.

(Function) Therefore, in the presser foot lifting device of the playback sewing machine of the present invention, the raised position of the presser foot is fixed when positioning the workpiece cloth at the start of sewing in trial sewing work, or when rotating the workpiece cloth during sewing. It is stored in a storage means in relation to 1a product data such as counting and feed pitch, and the presser foot is moved to a predetermined raised position based on the information stored in the storage means at each sewing part of the work cloth in the regenerated sewing operation. With this arrangement, the work cloth can be easily positioned and rotated, and the sewing work can be smoothly performed.

(Example) Hereinafter, an example of the present invention will be described in detail with reference to the drawings.

Now, in the playback sewing machine of this embodiment, as shown in FIG. 1, a presser foot 2 is supported on the head of a sewing machine frame 1 so as to be movable up and down, and a presser foot holder 3 is attached to the upper end of the presser foot 2. At the same time, a presser foot 4 is attached to the lower end. A presser spring 2a is disposed on the presser bar 2, and is configured to apply presser pressure to the work cloth via the presser foot 4 based on the spring force adjusted by an adjusting screw 2b. Holding the presser bar 3
A first rotary lever 5 is rotatably supported in the sewing machine frame 1 adjacent to the first rotary lever 5, and is biased to rotate in the direction of engagement with the presser foot holder 3 by the action of a spring 6.

A second rotating lever 5 is provided within the sewing machine frame 1 corresponding to the first rotating lever 5.
A rotating lever 7 is rotatably supported, and a connecting rod 8 is interposed between one arm portion and the first rotating lever 5, and an operating rod 9 is disposed on the other arm portion. are connected.

As shown in FIG. 1.2, an oil pan 10 provided at the bottom of the sewing machine frame 1 has a substantially rod-shaped linking body 11.
It is supported through the presser bar 2 so as to be linearly movable between two upper and lower positions corresponding to the raised position and the curled position of the presser bar 2, and the operating rod 9 is engaged at the lower end of the upper part of the presser bar 2. The first rotating lever 5, the connecting rod 8, the second rotating lever 7, the operating rod 9, and the linking body 11 constitute an operating mechanism 12, and the linking member 11 of the operating mechanism 12 is When moved upward, other parts of the actuator $112 and the presser bar holder 3
The presser bar 2 and the presser foot 4 are raised via the presser foot 4.

As shown in FIG. 1, a needle bar 13 is supported on the head of the sewing machine frame 1 in front of the presser foot 2 so as to be movable up and down.
A needle 14 is attached to its lower end. When the sewing machine main shaft (not shown) is rotated based on the drive of a motor 15 shown in FIG. Stitches are formed on the work cloth on the bed by cooperation with a thread loop catcher (not shown) provided in the machine.

As shown in FIGS. 1 to 4, a support bracket 16 is provided on the lower surface of the oil pan 10 near the lower end of the linking body 11.
is attached with screws 17. Support bracket 1
6 has a servo solenoid 18 constituting the drive means.
is attached by a plurality of screws 19, and an armature 20 is protruded from the center of the upper surface thereof so as to penetrate through the support bracket 16 and be retractable. And in this example,
The lower end of the linking part body 11 is brought into contact with the upper end surface of the armature 20, and the linking part body 11 and the armature 20 are directly engaged with each other.

Further, a horizontal forked arm 21 is provided at the rear of the armature 20.
is provided protrudingly, and a vertical bifurcated arm 22 is provided protrusively from the front portion. A guide pin 23 is provided protruding from the upper surface of the support bracket 16 at the rear of the armature 20 and engages with the horizontal fork arm 21 to guide the movement of the armature 20 into and out. When the armature 20 of the servo solenoid 18 is projected from the lower position shown by the solid line in FIG.
is directly moved upward, and the presser bar 2 and the presser foot 4 are raised via other members of the actuating mechanism 12 and the presser bar holder 3.

In front of the armature 20, a potentiometer 24 as a motion peak detector is mounted on the upper surface of the support bracket 16 above the servo solenoid 18 via a mounting plate 25, and an operating shaft 26 protrudes from the right side thereof. A rotary lever 27 is fitted and fixed at the base end of the operating shaft 26, and a pin 27a that engages with the vertical bifurcated arm 22 of the armature 20 is protruded B'i on the left side surface of the distal end thereof.

When the armature t20 of the servo solenoid 18 is projected and the presser foot 4 is raised, the operating shaft 26 of the potentiometer 24 is is rotated, and the potentiometer 24 outputs a detection signal corresponding to the amount of movement of the armature 20.

As shown in FIGS. 1 to 4, a pair of front and rear support legs 28 are protruded from the lower surface of the oil pan 10 near the left side of the armature 20, and a rotation shaft 29 is provided between the support legs 28.
is supported for rotation about a horizontal axis. An actuating member 30 is fitted and fixed to the front end of the rotation shaft 29, and a pair of actuating protrusions 30a are formed protruding from both sides thereof. An operating lever 31 is protruded from the lower part of the operating member 30, and the operating member 30 can be rotated to the right or left by operating the operating lever 31 with the knee.

First and second operation switches 32 and 33 constituting a switch means are disposed at the lower part of the sewing machine frame 1 in correspondence with both operating protrusions 30a of the operating member 30. and,
When the actuating member 30 is rotated to the right based on the operation of the operation lever 31 during positioning of the workpiece cloth at the start of sewing, the first operation switch 32 is closed, and the servo solenoid is activated from the switch 32. 18 is output, and when the actuating member 30 is rotated to the left based on the operation of the operation lever 31 during rotation of the work cloth during sewing, the second operation is performed. When the switch 33 is closed, a second command signal for operating the servo solenoid 18 is output from the switch 33.

As shown in FIG. 1, an operation box 34 is disposed at the bottom of the sewing machine frame 1, and the operation box 34 has first and second ascending position setting devices such as variable resistors constituting setting means. 35.36 are provided. And the first
The ascending position of the presser foot 4, which is raised and lowered by the operation of the servo solenoid 18 based on the first command signal 6 from the operation switch 32, is set in advance by the first ascending position setting device 35 according to the thickness of the workpiece cloth, etc. Also, the raised position of the presser foot 4, which is raised and lowered in response to the operation of the servo solenoid 18 based on the second command signal from the second operation switch 33, is set to a lower position than the raised position according to the first command signal. , second
The ascending position setting device 36 allows the ascending position to be set in advance according to the thickness of the workpiece cloth, etc.

As shown in FIG. 1.5, a key group 38 consisting of a plurality of keys with lamps is provided on the front surface of the operation box 34. In the key group 38, a memory key 39 is operated for setting the trial sewing mode and transferring all data during the trial sewing operation. The memorization key 40 is operated to store sewing data and the like for each sewing portion of the work cloth during trial sewing work. The regeneration key 41 is used during regeneration sewing work.
Operated to set regenerated sewing mode. In addition, the four pattern keys 42 are used during trial sewing work and regeneration sewing work.
It is operated selectively when the sewing pattern is selected and specified.

As shown in FIG. 1, a foot-operable operation pedal 37 is provided below the sewing machine frame 1 and includes a front pedal switch 66 and a rear pedal switch 67. When the rear part 37a side of the operating pedal 37 is pressed forward, the front foot switch 66 is turned on and a start signal is outputted to rotate the motor 15 at a speed corresponding to the amount of foot pressing. When the operation pedal 37 is returned to the neutral state, the front pedal switch 66 is turned to O.
FF is output, and a signal is output to stop the rotation of the motor 15 and stop the needle 14 at the bottom dead center below the throat plate.Furthermore, when the operation pedal 37 is subsequently depressed on the front portion 37b side, After the rear pedal switch 67 is turned on and the motor 15 is slightly rotated to perform thread trimming, a signal is output to stop the needle 14 at the top dead center above the throat plate.

Next, in the sewing machine configured as described above, the configuration of the control circuit mainly for controlling the operation of the servo solenoid 18 will be explained with reference to FIG.
The read-only memory (ROM) 52 is in the PU) 51.
and random access memory (RAM) as a storage means.
) 53 are connected. The ROM 52 stores programs for controlling the entire sewing machine, and the RAM 53 stores the movement ω of the armature 20 of the servo solenoid 18.
The operating amount of the potentiometer 24 corresponds to the servo solenoid 18 corresponding to the setting value of the first ascending position setter 35.
, the operating amount of the servo solenoid 18 corresponding to the set value of the second ascending position setter 36, etc. are stored. Further, the RAM 53 stores sewing data such as the number of stitches and feed pitch generated during the sewing of each sewing part of the work cloth during trial sewing work, and the sewing data of the first and second operation switches 32.
With the opening of ゜33, the first and second rising position 'Il setting device 3
5. A storage area is provided for storing data on the ascending position of the presser foot 4, which is moved based on the setting value of 5.36.

In addition, the CP (J51) includes a potentiometer 24 for detecting the motion layer, a first upper position setting device 35, a second ascending position setting device 36, a group of keys 38, a first operation switch 32, a second operation switch 33, as shown in the figure. A needle position detector 65 is attached to the end of the main shaft of the sewing machine and outputs a needle up signal and a needle down signal as the main shaft of the sewing machine rotates, and the front depression switch 66 and rear depression switch 67 of the operation pedal 37 are They are connected via an input interface 54, and various signals from them are input to the CPLJ 51.

Further, the CPU 51 includes a stitch number counter 58 that counts during the sewing operation based on either the needle up signal or the needle down signal from the needle position detector 65. Furthermore, the CPLJ51 has a servo solenoid 18 and a motor 1.
5 is the output interface 55 and driver 56.57
is connected from the CPU 51 to the servo solenoid 1.
A drive or stop signal is output to the motor 8 and the motor 15.

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

Now, in this playback sewing machine, for example, as shown in FIG.
When trial sewing is to be performed to sew the sewing machine, when the sewing machine is turned on, the program shown in the flowchart of FIG. 8 is started under the control of the CPU 51. 39 ON
Wait, and when the memory key 39 is turned on, step S2
Wait for the sewing pattern to be specified.゛When one sewing pattern is specified by the selection operation of the pattern key 42, the CPU 51 waits for the setting operations of the first and second ascending position setters 35, 36 in step S3, When the two elevated positions of the presser foot 4 are set between the lowest position and the highest position, the program advances to step S4.

In this step S4, the first operation switch 32 is turned off.
It is determined whether or not the first operation switch 32 is
is turned on based on the operation of the operating lever 31, and the CPU 5
1, the program advances to step S5, and the presser foot 4 is moved to the raised position according to the setting value of the first raised position setter 35 based on the operation of the servo solenoid 18. It is moved and arranged, and in this state the process proceeds to the next step S6. Further, in step S4, the first
If the operation switch 32 is not turned on, the program bypasses step S5 and proceeds to step S6. Therefore, when it is necessary to position the work cloth W1 and the piece of cloth W2 at the start of sewing, by turning on the first operation switch 32, the presser foot 4 is moved to a predetermined raised position, and the work cloth W1 and the piece of cloth W2 are moved to a predetermined raised position. The first sewing point P1 on the piece of cloth W2 can be easily positioned at the needle groove point.

In the next step S6, the second operation switch 33 is turned OFF.
It is determined whether or not the second operation switch 33 is pressed.
is turned on based on the operation of the operating lever 31, and the CPU 5
If the second command signal is input to step S7
At this time, the presser foot 4 is activated based on the operation of the servo solenoid 18.
is the ascending position (
is moved to a lower position than the raised position based on the first raised position setter 35, and in this state, the next step S8
Proceed to. If the second operation switch 33 is not turned on in step S6, the program bypasses step S7 and proceeds to step S8.

In step S8, even if the operation of the operation pedal 37 is waited,
By depressing the front part of the operation pedal 37 on the rear 37a side, the front depressing switch 66 is turned on, and the CPU 51
When the start signal is input to , the program proceeds to step S9.
Then, based on the OFF of the servo solenoid 18, the presser foot 4 is processed to the lowest position, and the processed cloth W1 and the piece of cloth W are processed.
A predetermined presser pressure is applied to 2. Next step S10
At this point, the motor 15 is activated at a rotational speed corresponding to the forward depression amount of the operating pedal 37, and operation of the sewing machine 81 is started. Therefore, a stitch is formed along one side edge of the cloth piece W2 from the sewing start point P1 on the work cloth W1 and the cloth piece W2 shown in FIG.

In the next step S11, the count counter 58 detects the count for each stitch, and counts the count based on the detection signal.Then, the process proceeds to step 812, and the front switch 66 of the operating pedal 37 is turned off. Wait for operation. Then, the scanning from step 810 to step S12 is continued until the front foot switch 66 is turned off, so that the workpiece cloth W shown in FIG.
Sewing along one side edge of the cloth piece W2 on top 1 continues. When the sewing is performed up to the first corner point P2 on the piece of cloth W2 and the front pedal switch 66 is turned off as the operation pedal 37 is returned from the front depression state to the neutral state, the rotation of the motor 15 is stopped. The needle 14 is stopped at the bottom dead center.

When it is confirmed in the next step S313 that the needle 14 is stopped at the needle down position below the needle plate by the needle down signal from the needle position detector 65, the process proceeds to the next step S14, and the operating pedal 37 Wait for the rear pedal switch 67 to be turned on by the rear pedal. By the way, in the case where the needle is stopped at the first corner point P2 as described above, the program proceeds to step S15 because the worker does not perform a rear depression operation on the front part 37b side of the operating pedal 37 during sewing. Proceed and operate the memorization key 40. At the same time as the memorization key 40 is operated, CPLJ51
In step 816, the sewing start point P1
The RAM 5 stores data on the raised position of the presser foot 4 and sewing data such as counting and feed pitch at the sewing position from the sewing start point P1 to the first corner point P2.
Write in the working area of 3.

After that, the process returns to step S4 and the first operating switch 3
2 is turned on, and if it is not turned on, the process proceeds to step S6 and the second operation switch 33 is turned on.
It is determined whether or not the

At the first corner point P2 on the piece of cloth W2, when the second operation switch 33 is turned on based on the operation of the operation lever 3°1 and the second command signal is input to the CPLJ 51, the servo solenoid 18 is turned on in step S7. Based on the operation, the presser foot 4 is moved to a raised position according to the setting value of the second upper limit position setting device 36. Therefore, in this state, the work cloth W1 and the piece of cloth W2 can be easily rotated about the first corner point P2, and in the next step S8, the front pedal switch 66 of the operating pedal 37 is turned on. Based on the activation signal, the program executes steps S9, S10. ..., and sewing can be performed along the next side edge of the cloth piece W2.

By repeating the scanning from step S4 to step S15 in this way, sewing from the first corner point P2 to the second corner point P3 of the piece of cloth W2 on the work cloth W1 shown in FIG. 6 is performed. Then, with the operation of the memorization key 40, the lifting position data of the presser foot 4 at the first corner point P2 and the sewing data for the sewing region from the first corner point P2 to the second corner point P3 are stored in the working area of the RAM 53. The second corner point P3 is stored at the second corner point P3.
After the work cloth W1 and the piece of cloth W2 are rotated with the presser foot 4 moved to the raised position based on the ON operation of the operation switch 33, the remaining side edge of the piece of cloth W2 is rotated based on the forward depression of the operation pedal 37. Sewing is done along the lines.

Then, the sewing ends at a sewing end point P on the cloth piece W2.
4, and the needle 12 is stopped at the bottom dead center based on the OFF of the front pedal switch 66 of the operation pedal 37 in step 812. Then, in step S13, it is confirmed that the needle 14 has stopped down, and in step S14, the needle 12 is stopped at the bottom dead center. When a thread trimming signal is input to the CPU 51 each time the operation pedal 37 is depressed, the process proceeds to step 817 where the motor 15 is slightly rotated and the needle 14 is stopped at the top dead center after the thread trimming is performed. Ru.

In the next step S18, when it is confirmed that the needle 14 has stopped at the top dead center based on the needle up signal from the needle position detector 65, the process proceeds to step 319, where the servo solenoid 18
is turned on, the presser foot 4h is raised to the highest position, and the pressure on the workpiece cloth W1 and piece of cloth W2 is released.

Thereafter, in step S20, the CPU 51 waits for the operation of the memory key 39, and at the same time as the memory key 39 is operated, in step 821, the presser foot 4 is raised at the second corner bond P3 on the cloth piece W2 and the sewing end point P4. position data, and both points P3. The sewing data for the sewing region between P4 is stored in the working area of the RAM 53. Then, in the next step S22, R
During AM53, the raised position data and sewing data of each sewing part stored in the working area are transferred to the storage area corresponding to the designated sewing pattern, and the trial sewing operation is completed.

Next, when regenerating sewing work is to be performed following the trial sewing work, the program shown in the flowchart of FIG. 9 is started under the control of the CPU 51 when the sewing machine is powered on. In step S23, the process waits for the playback key 41 to be turned on, and when the playback key 41 is turned on, the process advances to step S24 and waits for designation of a sewing pattern. When one sewing pattern is designated by the selection operation of the pattern key 42, the CPLJ 51 reads stored data corresponding to the designated sewing pattern from the storage area of the RAM 53 in step S25.

In the next step 826, it is determined whether or not there is a drive signal for moving the presser foot 4 to the first raised position in the read data. If there is a drive signal, the process proceeds to step 827 to control the servo By the operation of the solenoid 18, the presser foot 4 is moved to the raised position based on the raised position data, and in this state, the process proceeds to the next step S28.

If there is no drive signal for the presser foot 4 in step S26, the program bypasses step 827 and proceeds to step 328. Therefore, at the start of this recycled sewing work, the presser foot 4 is automatically placed at a predetermined raised position to easily position the sewing start point P1 on the workpiece cloth W1 and the piece of cloth W2 such as a pocket at the needle drop point. be able to.

In the next step 828, it is determined whether or not there is a drive signal for moving the presser foot 4 to the second raised position in the read data. If there is a drive signal, the process proceeds to step S29, and the servo solenoid 18, the presser foot 4 is moved to the raised position based on the raised position data, and in this state the process proceeds to the next step 530. If there is no driving signal for the presser foot 4 in step 828, the program bypasses step 829 and proceeds to step 830.

From step S30 to step 333, a program similar to the operation from step S8 to step 811 of the flowchart shown in FIG. 8 is executed, and the operating pedal 3
When the front pedal switch 66 is turned on with the depression operation on the rear 37a side of the servo solenoid 18, the servo solenoid 18 is
After the presser foot 4 is moved to the lowest position by F, the sewing operation is started by starting the motor 15, and the number of sewing stitches is counted by the counter 58.

In the next step S34, it is determined whether the number of sewing stitches for one sewing region has reached the memorized number of stitches, and until the number of stitches to be sewn in one sewing region reaches the memorized number of stitches, the scanning from step 832 to step S34 is continued, and the sewing operation is started. continues.

Then, in step S34, when the number of sewing stitches for one sewing region reaches the memorized number of stitches and sewing is performed up to the first corner point P2 on the piece of cloth W2 shown in FIG. 6, the program advances to step S35. Then, the needle 14 is stopped at the bottom dead center, and in this state, it is determined in the next step S36 whether or not the pattern has ended. As mentioned above, the first
If the needle is stopped at corner point P2, the program is executed at step 836 because the pattern is in the middle.
Then, the process returns to step 826, and it is determined whether there is a drive signal to move the presser foot 4 to the first raised position. If there is no signal, the process proceeds to step 828, and it is determined whether there is a drive signal to move the presser foot 4 to the second raised position. is determined.

If there is a drive signal in this step 828,
In the next step S29, the servo solenoid 18 is operated to move the presser foot to the raised position based on the raised position data. Therefore, in this state, the work cloth W1 and the piece of cloth W2 can be rotated about the first corner point P2, and in the next step S30, the front pedal switch 66 of the operation pedal 37 is turned on, so that the program The process proceeds to steps 330, S31, . . . and sewing can be performed along the next side edge of the cloth piece W2.

By repeating the scanning from step S26 to step S36 in this way, the first corner point P2 of the piece of cloth W2 on the workpiece cloth W1 shown in FIG.
Sewing is performed from to the second corner point P3, the presser foot 4 is moved to the raised position at the second corner point P3, and sewing is performed from the second corner point P3 to the end point P4. After the needle is stopped in step 835, when it is determined in step 836 that the pattern has ended, the program moves to the next step S37.
Proceed to. From step 837 to step S39, a program similar to the operation from step 817 to step S19 of the flowchart shown in FIG. 8 is executed, and after the thread cutting operation is performed and the needle 14 is stopped at the top dead center. , the presser foot 4 is raised to the highest position as the servo solenoid 18 is turned on, and the regenerated sewing operation is completed.

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 above, the present invention stores in advance the elevated position of the presser foot at a specific sewing area of the workpiece fabric during the trial sewing operation, thereby increasing the position of the presser foot at the specific sewing area of the workpiece fabric during the recycled sewing operation. The presser foot is automatically placed at a predetermined raised position based on the stored information, resulting in an excellent effect of significantly improving work efficiency.

[Brief explanation of drawings]

FIG. 1 is a partial perspective view showing an embodiment of a sewing machine embodying this invention, FIG. 2 is a partial sectional view showing an enlarged support structure of a servo solenoid, and FIG. - A partial sectional view taken along line A, Figure 4 is a partial sectional view taken along line B-B in Figure 2, Figure 5 is a partial front view showing an enlarged view of a group of keys on the front of the operation box, and Figure 6 is a machining process. Partial plan view showing an example of sewing a piece of cloth such as a pocket on cloth, No. 7
The figure shows a control circuit diagram for controlling the operation of the servo solenoid and motor, and Figures 8 and 9 show the operation of trial sewing and recycled sewing when sewing a piece of cloth onto the workpiece cloth shown in Figure 6. FIG. DESCRIPTION OF SYMBOLS 1... Sewing machine frame, 4... Presser foot, 18... Servo solenoid constituting drive means, 35. 36... First and second elevation position setters constituting setting means, 51.
...CPU constituting the control means, 53...RAM constituting the storage means. Patent applicant: Brother Industries, Ltd. Agent
Patent Attorney On 1) Hironobu iI6 Figure L-1111■

Claims (1)

[Scope of Claims] 1. A storage device (53) for storing sewing data related to sewing a predetermined length during trial sewing work, and is capable of performing regenerated sewing work based on the stored sewing data. In a playback sewing machine, a presser foot (4) supported on a sewing machine frame (1) so as to be movable up and down, and a drive means (18) for raising and lowering the presser foot (4).
, setting means (35, 36) for setting the lifting position of the presser foot (4) by the drive means (18), and the storage means (5).
3) has a memory area for storing the raised position of the presser foot (4) set by the setting means (35, 36) during trial sewing work, and when the presser foot (4) Storage means (53)
a control means (51) for controlling the drive means (18) so that the presser foot is placed at a raised position corresponding to information stored in a storage area of the playback sewing machine. .