JPH0659349B2 - sewing machine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention relates to a sewing machine capable of performing a sewing operation based on sewing data stored in advance.

(Prior Art) Conventionally, for example, when a quadrilateral pocket cloth piece is sewn to a cloth, a needle drop is performed while performing a trial sewing operation to form a stitch along each side edge portion of the pocket cloth piece. After detecting the change in cloth thickness (passing through the overlapping step section) by the detector provided on the work cloth feeding side from the point, after the step is passed, the step is detected based on the signal output from the detector. There is a sewing machine which stores the number of stitches up to the portion, stores the needle position at the end of sewing of each peripheral portion, and performs the reproduction sewing operation based on the stored data.

(Problems to be Solved by the Invention) However, in this conventional sewing machine, the detector is composed of a light projecting element and a light receiving element, and the detection level, that is, the sensitivity, depends on the type of the work cloth fed between the two. The sensitivity adjustment knob is operated to change the setting, and the detection signal is output based on the change in the amount of light transmitted to the work cloth. When the work cloths having different rates are used during the reproduction sewing work, it is necessary to perform the troublesome work of changing and setting the detection level of the detector by operating the sensitivity adjustment knob prior to the reproduction sewing work. Even if the memory area is provided with a plurality of memory areas for storing sewing pattern data such as the number of stitches, each memory area cannot store or reproduce the operation amount of the sensitivity adjustment knob. The sensitivity adjustment knob had to be manually operated every time the sewing pattern data of the area was read.

Configuration of the Invention (Means for Solving the Problems) In order to solve the above problems, the present invention includes a needle that is vertically moved across a work cloth supporting surface as the sewing machine main shaft rotates, A seam forming device for forming a seam on the work cloth on the work cloth support surface, a work cloth feeding device for operating the work cloth in synchronization with the rotation of the sewing machine spindle, and a light projecting element. A detector that is composed of a light receiving element and that is provided on the cloth feeding side from the needle drop point and that detects the edge of the work cloth or the overlapping step fed between the two based on the change in the amount of light transmission. And a means for setting data on the number of stitches to be sewn between the end of the work cloth or the step of superposition of the work cloth and the end of the work or step of superposition of the work cloth. Depending on the type, the detector A sensitivity adjusting device for adjusting the sensitivity, an externally operable first operating member for operating the sensitivity adjusting device, and one sensitivity data adjusted by the sensitivity adjusting device and one stitch number data, respectively. A rewritable and rewritable storage means having a plurality of storage areas for storing each of them, and a second operation member capable of being operated externally for reading the sensitivity data and the stitch number data stored in the storage area of the storage means. , The sensitivity data and the stitch number data of the storage means are read out for each set based on the operation of the second operation member, and the operations of the stitch forming device and the work cloth feeding device are controlled based on the respective data. After the operation of the first control means and the second operation member, the sensitivity data and the number of stitches data of the storage means are set for each set based on the operation of the first operation member. Read the data and adjust the sensitivity of the detector by operating the sensitivity adjustment device, replace the new sensitivity data with the previously read sensitivity data, and based on the new sensitivity data and the stitch number data, the stitch And a second control means for controlling the operation of the forming device and the work cloth feeding device.

(Operation) According to the present invention having the above-described configuration, the number of stitches to be sewn between the end of the work cloth and the overlapping step after the detection of the end of the work cloth or the overlapping step in the test sewing operation. In addition to setting the data, the sensitivity data adjusted by the sensitivity adjusting device and the stitch number data are stored as a set independently in a plurality of sets, and by operating the first operating member during the reproduction sewing operation, The sensitivity data and the stitch number data are read out for each set, and the operations of the stitch forming device and the work cloth feeding device are controlled based on the respective data. In this way, the sensitivity data that is automatically adjusted according to the work cloth is stored together with the stitch number data, so no matter which set of data is read, the sewing work can be performed immediately without changing the sensitivity of the detector. You can start and efficiently sew various work cloths. Also, when using a work cloth with a different amount of light transmission from the work cloth used during the trial sewing operation during the reproduction sewing operation, operate the second operation member and then the first operation member. The previously stored sensitivity data can be easily replaced with the subsequently adjusted sensitivity data without the need for the laborious task of manually changing the sensitivity of the detector.

Embodiment An embodiment of a sewing machine embodying the present invention will be described below with reference to the drawings.

As shown in FIG. 2, the arm portion 1a of the sewing machine frame 1
A sewing machine main shaft 2 is rotatably supported on the machine, and a driven pulley 3 is mounted on the right end portion thereof. Then, as shown in FIG. 1, the power of the motor 4 arranged below the bed portion 1b of the sewing machine frame 1 is transmitted to the sewing machine main shaft 2 via the belt 5, the driven pulley 3, etc., and the sewing machine main shaft 2 is rotated. It As shown in FIGS. 1 and 5, a needle bar 7 having a needle 8 at its lower end is supported by the arm 1a so as to be movable up and down, and the needle 8 is machined on the bed 1b as the sewing machine spindle 2 rotates. It is moved up and down across the fabric support surface 6. The needle 8 and a thread catcher (not shown) in the bed 1b cooperate with each other to form a lock stitch on the work cloth W on the work cloth support surface 6. A stitch forming device is constituted by the needle 8 and the thread catcher.

Further, as shown in FIG. 6, a sliding plate 9 and a needle plate 10 forming a part of the work cloth supporting surface 6 are attached to the bed portion 1b, and the needle plate 10 is allowed to pass the needle 8. Needle drop hole 1
1 and three feed dog openings 12 extending in the cloth feed direction are formed. Further, in the bed portion 1b, there are provided feed dogs 13 to which a known four feed motion is imparted in synchronism with the rotation of the sewing machine main shaft 2, and the feed dogs 13 pass through the feed dog openings 12 and work cloths. It is adapted to appear and disappear on the support surface 6. The arm portion 1a corresponding to the feed dog 13
Is provided with a presser foot (not shown) for pressing the work cloth W on the work cloth supporting surface 6 against the feed dog 13, and a work cloth feeding device for transferring the work cloth W is configured by both of them. .

As shown in FIGS. 1 and 5, a support case 14 located on the work cloth feeding side from the needle drop point is attached to the front side surface of the arm portion 1a, and a light projecting element 15 is provided in the support case 14. It is housed. The lower end of the light projecting element 15 is covered with a transparent protective plate 16 fitted in the support case 14. On the other hand, as shown in FIGS. 5 and 6, a support case 17 is fixedly mounted in the bed portion 1b on the cloth feeding side from the needle drop hole 11, and an upper portion thereof is fitted to the needle plate 10. There is. And this support case 1
A light receiving element 18 for receiving the light emitted from the light projecting element 15 is housed in the inside 7. The upper end of the light receiving element 18 is a transparent protective plate 17a fitted to the support case 17.
Are covered by. A work cloth detector 19 is constituted by the light projecting element 15 and the light receiving element 18. The light receiving element 18 directly receives the light from the light projecting element 15, and the work cloth W is sent between the two and the optical path thereof. When it is blocked, it receives light that passes through the work cloth W, and detects the end portion of the work cloth W or the overlapping step portion of the two work cloths W based on the change in the light transmission amount. Then, a predetermined signal is output.

As shown in FIGS. 2 to 4, the left side surface of the driven pulley 3 has a first reflection plate 2 having an arcuate cutout 20a on the outer circumference.
0 is attached by two screws 21. Further, between the outer peripheral edge of the first reflector 20 and the side surface of the pulley 3, a second reflector 22 having a ring shape and having a notch 22a on the inner circumference is attached. The notches 20a and 22a of the reflectors 20 and 22 are arranged at an interval of about 180 degrees, and the portion defined by the notch 20a and the inner circumference of the second reflector 22 is for detecting the needle up position. The surface of the first reflection plate 20 that constitutes the non-reflection surface 23 and is located concentrically with the non-reflection surface 23 constitutes the reflection surface 24.
On the other hand, the notch 22a of the second reflection plate 22 and the first reflection plate 2
The portion partitioned by the outer peripheral edge of 0 constitutes the non-reflecting surface 25 for detecting the needle position, and the surface of the second reflecting plate 22 located concentrically with the non-reflecting surface 25 is the reflecting surface 2
6 is composed. Further, outside the notch 22a, a non-reflective surface 27 and a reflective surface 28 for generating a synchronization signal (timing pulse) are alternately formed on the surface of the second reflective plate 22 with a predetermined angular interval. .

A support body 31 is mounted in the arm portion 1a by three screws 30 via a mounting plate 29 so as to be located on the outer periphery of the sewing machine main shaft 2 in the vicinity of the reflection plates 20 and 22.
A detector 32 for detecting a needle up position, a detector 33 for detecting a needle down position, and a detector 34 for detecting a rotation angle, which are opposed to the non-reflective surfaces 23, 25, 27, are mounted on the support 31, respectively. Has been done. Each of the detectors 32 to 34 is a light projecting element 32.
a to 34a and light receiving elements 32b to 34b,
When the driven pulley 3 rotates, each light projecting element 32a
The light emitted from .about.34a is reflected by the reflecting surfaces 24, 26 and 28 and absorbed by the non-reflecting surfaces 23, 25 and 27. The detectors 32 to 34 output predetermined signals when the reflected light is incident on the light receiving elements 32b to 34b, and do not output the signals when the reflected light is not incident.

Next, the control circuit of the sewing machine in this embodiment will be described with reference to FIGS. 1, 7, and 8. An operation panel 40 is provided on the front surface of the arm portion 1a, and a memory key 41, a pattern number designation key 42, a cloth thickness detection key 43 as a first operation member, a learn key 44, and an operation panel 40 are provided on the operation panel 40. A reproduction key 45 as a second operation member is provided. In addition, on each of the keys 41 to 45, a light emitting diode 41 for a monitor that blinks when the key is operated.
a to 45a are provided.

The central processing unit (CPU) 46 shown in FIG. 1 is connected to an operation pedal 47 that also serves as a sewing machine start switch and a sewing machine stop switch.
By the drive stop signal output based on the operation of
U46 controls the drive stop of the motor 4. A sensitivity adjusting device 48 is connected to the work cloth detector 19, and one work cloth W is set between the light emitting / receiving elements 15 and 18 of the work cloth detector 19 and the cloth thickness detecting key 43 is operated. When operated, the CPU 46 outputs a control signal for setting the reference voltage of the sensitivity adjusting device 48 or the light emission amount of the light projecting element 15. On the other hand, the output voltage of the light receiving element 18 based on the light from the light projecting element 15 is input to the sensitivity adjusting device 48, and the sensitivity adjusting device 48 compares the reference voltage with the output voltage and outputs the comparison result to the CPU 46. Output. And CPU
Reference numeral 46 is a reference voltage or the light projecting element 1 according to the comparison result.
5, the light receiving element 18 sets the light emitting amount of
The above comparison and the change setting are repeated until the light from is received in the best condition. Thereby, the detection level (sensitivity) is set according to the type (thickness) of the work cloth, and the pocket piece P
It is possible to distinguish the overlapped portion and the non-overlapped portion such as.

Further, if the work thickness sensing key 43 is pressed without setting the work cloth W between the light emitting / receiving elements 15 and 18, the end portion of the work cloth W can be detected.

The detailed configuration of the sensitivity adjusting device 48 is the same as that described in the specification and drawings of Japanese Patent Application No. 58-193189 filed by the same applicant as this application, and therefore detailed description thereof will be omitted.

The CPU 46 has a read-only memory (ROM) 4
9 and a random access memory (RAM) 50 are connected to each other, and a program for controlling the operation of the entire sewing machine is stored in the ROM 49. On the other hand, RAM50
As shown in FIG. 8, there are provided four memory areas corresponding to the pattern numbers on the pattern number designation key 42. Each memory area is processed as shown in FIGS. 9 and 10, for example. Sewing pattern data, which will be described later, when the pocket cloth piece P is sewn on the cloth W is stored. Further, in each memory area of the RAM 50, the detector 1 adjusted by the sensitivity adjusting device 48 according to the type of the work cloth W is provided.
The sensitivity data of 9 are stored as a set with the sewing pattern data and the like independently.

Then, based on the operation of the memory key 41, the CPU 46
Sets a storage mode for storing each data in the RAM 50. When any one of the pattern number designating keys 42 is selected and operated at the time of setting the storage mode, the CPU 46 causes the RA corresponding to the number.
Specify the memory area of M50. When the cloth thickness detecting key 43 is operated with the work cloth W set between the light emitting / receiving elements 15 and 18 of the work cloth detector 19 in the storage mode setting, the CPU 46 controls the sensitivity adjusting device 48. Then, the sensitivity adjusting operation is performed, and the sensitivity data corresponding to the work cloth W is stored in the RAM 50.

The CPU 46 outputs from each of the detectors 32 to 34 after the work cloth detector 19 detects the overlapping step portion of the work cloth W and the pocket cloth piece P due to the operation of the sewing machine when the storage mode is set. The counting of the detected signals is started, and the number of stitches from the detection of the step portion to the end of the sewing up to the step portion is calculated. Based on the subsequent operation of the memory key 44, the data setting means 51 included in the CPU 46 causes the stitch number data from the detection of the step portion to the step portion and the stop data corresponding to the needle position at the end of sewing up to the step portion. The CPU
Temporarily stored in 46 registers. The sewing pattern data is composed of the stitch number data and the stitch position stop data.

The temporarily stored sewing pattern data and sensitivity data are stored as a set pattern in the designated area of the RAM 50 based on the operation of the reproduction key 45.

The control means 52 included in the first and second control means included in the CPU 46 operates from the memory area corresponding to the designated pattern number based on the operation of the reproduction key 45 and the pattern number designation key 42 after the sewing pattern is set. Read sensitivity data and sewing pattern data,
The operation of the stitch forming device including the needle 8 and the work cloth feeding device including the feed dog 13 is controlled based on the respective data.

Next, the operation of the sewing machine configured as described above will be described.
First, a trial sewing operation for storing the sewing pattern data necessary for sewing the pocket cloth piece P on the work cloth W shown in FIG. 9 will be described with reference to FIG. When the memory key 4 shown in FIG. 7 is operated, step S in FIG.
The determination result of 1 is YES, and the CPU 46 sets the storage mode. Next, when any of the pattern number designating keys 42 shown in FIG. 7 is operated, the determination result of step S2 becomes YES, and the memory area of the RAM 50 corresponding to the operated pattern number is designated. Next, in step S3, the light emitting / receiving element 1 of the work cloth detector 19 is detected.
A piece of work cloth W shown in FIG. 9 is set between 5 and 18.

When the cloth thickness sensing key 43 shown in FIG. 7 is subsequently operated, the determination result in step S4 becomes YES, and the sensitivity adjusting device 48 starts the sensitivity adjusting operation in step S5. During this operation, the CPU 46 controls the light emitting diode 43a of the cloth thickness detecting key 43 to blink in step S6. Next, in step S7, after the sensitivity adjusting operation by the sensitivity adjusting device 48 is completed, the light emitting diode 43a is
Is turned off.

Succeedingly, in a step S8, when the pocket cloth piece P is set on the work cloth W and the operation pedal 47 shown in FIG. 1 is depressed, the judgment result in the step S9 becomes YES, and the process advances to the next step S10 to proceed to the sewing machine. The operation of is started. Along with this, the stitch forming device and the work cloth feeding device are operated to form a seam along one side edge portion Pa of the pocket cloth piece P. Then, in step S11, the pocket cloth piece P
After the superposed stepped portion of the work cloth W crosses the optical path of the work cloth detector 19 and the stepped portion is detected, step S1
The process 2 is performed, and the number of stitches is counted based on the needle up position detection signal. Next, when the sewing along one side edge portion Pa of the pocket cloth piece P is completed with the operation of the sewing machine,
When the operation pedal 47 is released, step S1
The result in 3 is YES, and the routine proceeds to the next Step S14. In step S14, it is determined whether or not the memory key shown in FIG. 7 has been operated, and if the result is YES, the CPU 46 temporarily stores stitch number data from step detection to step step in step S15. The stop position of the needle 8 is calculated based on the signals output from the detectors 31 to 34, and the stop data is stored in the register together with the stitch number data. Further, the CPU 46 temporarily stores the sensitivity data set by the sensitivity adjusting device 48 in the register together with the respective data as a set.

Next, in step S16, it is determined whether or not the one sewing pattern is finished. In this case, since the sewing of only one side edge portion Pa of the pocket cloth piece P is finished, the result is NO, Steps S9 to S16 are repeated three times in order to sew the remaining edge portions Pb to Pd. When the result of step S16 is YES, the reproduction key 4 shown in FIG.
When 5 is operated, each of the above-mentioned data is stored as a set pattern in the memory area of the RAM 50 corresponding to the previously designated pattern number. In this way, the trial sewing work is completed.

Similarly, when another pattern number designation key 42 is operated, sewing data and sensitivity data different from those described above can be stored in the corresponding memory area of the RAM 50.

Next, the reproduction sewing operation will be described with reference to FIG.
When performing the reproduction sewing work using the data stored by the trial sewing work, first, in step S18, the reproduction key 4 is pressed.
When 5 is operated, the CPU 46 sets the reproduction mode.
Then, in the next step S19, any one of the pattern number designating keys 42 is operated to select a sewing pattern. Then, the CPU 46 reads the corresponding data from the RAM 50.

Next, in step S21, one work cloth W different in kind from the work cloth W used for the trial sewing operation is set and the cloth thickness detecting key 43 is operated. Operates the sensitivity adjusting device 48 to adjust the sensitivity of the work cloth detector 19 corresponding to the newly set work cloth W, and the sensitivity data is stored in the memory area of the RAM 50 corresponding to the previously designated pattern number. Replace with the sensitivity data of. Of course, it is not necessary to adjust the sensitivity when using the work cloth W of the same type as the trial sewing work. When the pocket cloth piece P is set on the work cloth W and the sewing machine start switch is turned on by depressing the operation pedal 47 in step S22, the process proceeds to step S23 and the sewing machine is operated. After the overlapped step is detected by the work cloth detector 19 in step S24 during sewing along the green part Pa of one side of the pocket cloth P, the process proceeds to step S25, and the stitch number data stored in the RAM 50 is changed. Based on this, after the step is detected, the sewing up to the step is executed. Then, in step S26, the sewing machine is stopped based on the stop data also stored in the RAM 50.

Next, in step S27, it is determined whether or not the sewing corresponding to the selected sewing pattern has been completed. The result is NO
In the case of, the above steps S22 to S27 are repeated, and when the determination result of step S27 is YES, the reproduction sewing operation is completed.

Similarly, when another pattern number designating key 42 is operated, the reproduction sewing operation is performed based on the data read from the corresponding memory area of the RAM 50.

EFFECTS OF THE INVENTION As described in detail above, according to the present invention, the sensitivity data and the number of stitches data can be stored as one set, and a plurality of sets can be stored independently. Therefore, no matter which set of data is read, the sewing operation can be started immediately without changing the sensitivity of the detector, and various work cloths can be efficiently sewn. Also, when performing re-sewing work using a work cloth of a different type (light transmittance) from the work cloth used in the trial sewing work, it is not necessary to perform a troublesome sensitivity adjustment work, and the second operation member is operated. After that, the sensitivity is automatically changed and set only by operating the first operation member, and a reliable work cloth detection operation can be performed based on the sensitivity data. Therefore, according to the stored stitch number data, Accurate sewing work can be performed regardless of the type of work cloth. Moreover, when performing re-sewing work with a work cloth having a light transmittance different from that during the trial sewing work, in addition to the second operation member that is operated when the same work cloth is used, the detector Since the first operation member that is operated when adjusting the sensitivity is used, it is very easy for an operator to remember the operation method and to operate it easily.

[Brief description of drawings]

FIG. 1 is a view showing the appearance and control circuit of a sewing machine embodying the present invention, FIG. 2 is an enlarged cross-sectional view of the essential parts showing various detectors, and FIG. 3 is a cross-sectional view taken along the line III-III in FIG. 4 is a sectional view taken along the line IV-IV in FIG. 2, FIG. 5 is an enlarged sectional view of an essential part showing the work cloth detector, and FIG. 6 is a plan view of the bed portion.
FIG. 7 is a partially enlarged front view of the operation panel, and FIG. 8 is a RAM.
FIG. 9 is a partial plan view showing a work cloth and the like, and FIG.
FIG. 11 is a sectional view of the same, FIG. 11 is a flowchart at the time of trial sewing work, and FIG. In the figure, 2 is a sewing machine spindle, 6 is a work cloth supporting surface, 8 is a needle, 13 is a feed dog, 15 is a light emitting element, 18 is a light receiving element,
Reference numeral 19 is a work cloth detector, 48 is a sensitivity adjusting device, 50 is a RAM constituting storage means, 51 is data setting means, 43 is a cloth thickness sensing key as a first operation member, and 45 is a second operation member. The reproduction key 52 is a control means that constitutes both the first and second control means.

Continuation of the front page (56) Reference JP 61-82784 (JP, A) JP 57-55175 (JP, A) JP 57-43782 (JP, A) JP 55-5669 (JP , A) JP-B 3-73881 (JP, B2) JP-B 3-58476 (JP, B2) JP-B 2-48272 (JP, B2) JP-B 3-9756 (JP, B2) JP-B Sho 60-42748 (JP, B2)

Claims (1)

[Claims] 1. A work cloth (W) on the work cloth support surface (6) including a needle (8) which is moved up and down across the work cloth support surface (6) as the sewing machine spindle (2) rotates. ) And a work cloth feed device (13) for transferring the work cloth (W), which is operated in synchronization with the rotation of the sewing machine main shaft (2).
Etc.), a light projecting element (15) and a light receiving element (18), and is provided on the cloth feeding side of the needle drop point and is fed between the two (15, 18). (19) for detecting the edge or the overlapping step of the work cloth (W) based on the change in the amount of transmitted light, and the edge or the overlapping after the detection of the edge or the overlapping step of the work cloth (W). A sewing machine having means (51) for setting the number of stitches data to be sewn up to the step portion, for adjusting the detection sensitivity of the detector (19) according to the type of the work cloth (W). Sensitivity adjusting device (48), a first operation member (43) operable to operate the sensitivity adjusting device (48) externally, sensitivity data adjusted by the sensitivity adjusting device (48), and One stitch number data each A readable and rewritable storage unit (50) having a plurality of storage regions to be stored, and an externally operable first unit for reading out the sensitivity data and the stitch number data stored in the storage region of the storage unit (50). Based on the operation of the second operation member (45) and the second operation member (45), the sensitivity data and the number of stitches data of the storage means (50) are read out for each group, and based on the respective data, After the operation of the first control means (52) for controlling the operations of the stitch forming device (8 etc.) and the work cloth feeding device (13 etc.), the first operation after the operation of the second operation member (45). Based on the operation of the member (43), the sensitivity data and the number of stitches data of the storage means (50) are read out for each set, and the sensitivity adjusting device (48) is operated to activate the detector (19). Adjust the sensitivity and The degree data is replaced with the previously read sensitivity data, and the operation of the stitch forming device (8 etc.) and the work cloth feeding device (13 etc.) is controlled based on the new sensitivity data and the stitch number data. And a control means (52).