JPS61232884A - 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 relates to a sewing machine that controls the functions of a work cloth feeder, a seam forming device, etc. based on the detection of marks attached to work cloth. It is.

(Prior art and problems to be solved by the invention) Conventionally,
When sewing two pieces of work cloth, there may be a difference between the feed amount of the lower work cloth and the feed amount of the upper work cloth due to expansion and contraction of the work cloth. There have been problems in that the ends of the cloth are misaligned, and the joint positions of the patterns of both processed cloths are misaligned.

Furthermore, when sewing a piece of cloth such as a label onto a fabric using stitches of a certain length, the operation of the sewing machine is controlled by counting the number of stitches. Slippage may occur between the seams, making it difficult to form seams of accurate length.

(Object of the invention) This invention was made in view of the above circumstances, and
The purpose is to provide a sewing machine that can prevent misalignment of the two upper and lower workpiece cloths, misalignment of the joint position of the handle, etc., or that can reliably form a seam of a certain length. be.

(Means and effects for solving the problem) In order to achieve the above object, the present invention includes a needle that is moved up and down across a work cloth support surface, and a work cloth on the work cloth support surface. a stitch forming device for forming stitches on the fabric; a work cloth feeding device operated in synchronization with the stitch forming device to feed the work cloth; and marks attached to the work cloth at equal intervals. and a detection device that is disposed on the cloth feeding side of the needle drop point and outputs a detection signal when it faces the mark as the work cloth is fed, and a detection device that outputs a detection signal based on the count of the detection signal from the detection device. and control means for controlling the operation of at least one function of the sewing machine.

Therefore, the functions of the sewing machine, such as the feeding device and the stitch forming device, are controlled based on the detection signal.

(Embodiments) [First Embodiment] A first embodiment of a sewing machine embodying the present invention will be described below with reference to the drawings. As shown in Figure 2, the sewing machine frame I
A sewing machine main shaft 2 is rotatably supported on the arm portion 1a, and a driven pulley 2a is attached to the end thereof. On the other hand, a drive motor 3 is mounted on the bottom surface of the bed portion 1b of the sewing machine frame 1.
is attached, and its power is transmitted to the main shaft 2 of the sewing machine via a drive boob') 3a, a belt 4, a driven pulley 2a, and the like.

A needle bar 6 having a needle 5 at its lower end is supported by the arm portion 1a so as to be movable up and down, and the needle 5 moves up and down across the work cloth support surface 7 of the bed portion 1b as the sewing machine main shaft 2 rotates. be done. A stitch is formed on the work cloth W on the work cloth support surface 7 by the cooperation of the needle 5 and a thread loop catcher (not shown) in the bed portion 1b. Note that the needle 5 and thread loop catcher constitute a stitch forming device.

Also, on the bed portion 1b facing the needle 5, a feed dog 8 is provided with a well-known four-feed motion in synchronization with the rotation of the sewing machine main shaft 2.
is provided. In addition, two pieces of work cloth W shown in FIG.
, L, marks M extending in a direction perpendicular to the cloth feeding direction are formed at equal intervals on the lower work cloth W.

This mark M is constructed by weaving magnetized thread into the work cloth W.

Further, on the cloth feeding side of the needle bar 6, the arm portion 1
In a, a presser foot 10 having a presser foot 9 at its lower end is supported so as to be movable up and down between an upper inactive position and a lower working position, and when the presser foot 9 is placed in the lower working position. , the work cloth W is pressed toward the feed dog 8.

Note that the presser foot 9 and the feed dog 8 constitute a feed device.

As shown in FIG. 2, a control box 11 is attached to the lower side of the drive motor 3. As shown in FIG. This control box 1
1 is connected to a random access memory (RAM) 12 and a read only memory (ROM) 13.
A central processing unit (CPU) 14 as an l1 means is built-in. Then, with the operation of the foot pedal 15 shown in FIGS. 1 and 2, the CPU 14 controls the motor driver 16.
The drive motor 3 is driven through.

Further, as shown in FIGS. 3 and 4, a detector 17 made of a Hall element is mounted on the bed portion tb on the cloth feeding side from the needle drop point, and when the work cloth W is fed, the detector 17 When the mark M of the work cloth W faces 17,
A mark detection signal is output to the CPU 14.

An operation panel 1 is provided in front of the arm portion 1a of the sewing machine frame l.
8 is attached, and the sewing length and the arrangement interval of the marks M are manually set by operating the button 19 on the operation panel 18. Then, the CPU 14 calculates the number of marks corresponding to the sewing length and stores it in the RAM 12. In addition, by depressing the foot pedal 15, the start switch (
(not shown) is turned on, the CPU 14 drives the drive motor 3 to operate the stitch forming device and the feed device, and also counts mark detection signals from the detector 17, and the counted number is stored in the RAM 12. When the number of marks matches the stored number of marks, the driving of the drive motor 3 is stopped and the operation of the sewing machine is stopped.

Now, in the sewing machine configured as described above, when sewing a piece of cloth such as a label/sash onto the work cloth W shown in FIG. 3, as shown in FIG. Set the work cloth W and the piece of cloth. Then, using the operation button 19 on the operation panel 18, the sewing length and the arrangement interval of the marks M are input. Then, the CPU 14 calculates the number of marks corresponding to the stitch length and stores it in the RAM 12. Next, when the foot pedal 15 shown in FIG. 2 is depressed and the sewing machine start switch is turned on, the determination result in step SL shown in FIG. 5 becomes YES and the process proceeds to step S2.

Then, the CPU 14 drives the drive motor 3 via the motor driver 16. Therefore, the sewing machine is operated, and the stitch forming device begins to form stitches, and at the same time, feeding begins to be applied to the work cloth W.

Further, in step S3, the CPU 14 starts counting the marks M on the work cloth W based on the mark detection signal output from the detector 17 as the work cloth W is fed. Then, in step S4, the CPU 14 selects the mark M.
It is determined whether the count number has reached the set value, and when the result is YES, the operation of the sewing machine is stopped in step S5.

Therefore, in this embodiment, by counting the number of marks, it is possible to control the operation of the feed device and the stitch forming device of the sewing machine, thereby reliably forming a stitch of a constant length.

[Second example]

Next, a second embodiment in which the present invention is embodied in a vertical feed sewing machine will be described with reference to FIGS. 6 to 8, focusing on the differences from the first embodiment. In this embodiment, upper feed dogs 20 are disposed on both left and right sides of the presser foot 9 above the feed dog 8 (hereinafter referred to as the lower feed dog 8). As the main shaft 2 of the sewing machine rotates, the feed dogs 8 and 20 are operated in synchronization, so that the work cloth W is fed with the work cloth W being held between the feed teeth 8 and 20. is now granted.

A lower feed adjustment device 2 is provided on the lower feed dog 8 and the upper feed dog 20.
1 and upper feed adjustment device 22 are respectively operatively connected, and by operating a feed adjustment dial (not shown) of each feed adjustment device 21, 22, the amount of cloth feed by both feed teeth 8, 20 can be changed and set. There is. Further, as shown in FIGS. 1 and 7, a feed change device 23 consisting of a servo solenoid is operatively connected to the upper feed dog 20, and when the feed change device 23 is operated, the upper feed adjustment device 22
The set cloth feed amount is changed by .

Furthermore, an upper detector 24 is disposed on the work cloth support surface 7 opposite to the detector 17 (hereinafter referred to as the lower detector 17).
A shielding plate 25 for shielding magnetism is provided on the work cloth support surface 7 between the rain detectors 17 and 24.
is installed.

Further, gaps are formed between each of the detectors 17, 24 and the shielding plate 25 to allow passage of the work cloth W.

Therefore, in this embodiment, two pieces of work cloth W having marks M formed at equal intervals are sewn together,
When sewing so that the patterns of the reworked cloth W match, a part of the reworked cloth W is attached to each detector 17.24 and the shielding plate 25.
and set the reworked cloth W on the workpiece cloth support surface 7. Next, as in the first embodiment, the sewing length is input.

Thereafter, when the foot pedal 15 shown in FIG. 2 is depressed and the sewing machine start switch is turned ON, the determination result in step SIO shown in FIG.
Proceed to l. Then, the sewing machine is operated, the stitch forming device starts forming stitches, and both feed dogs 8.20
As a result, feeding begins to be applied to the reworked cloth W.

Further, in step S12, the CPU 14
The marks M on each workpiece cloth W are started to be counted based on the mark detection signal outputted from each detector 17 as the workpiece cloth W is fed. Then, in step S13, the CPU 14 determines whether or not there is any deviation in the output timing of the mark detection signals from each detector 17.24, and if there is no deviation, the CPU 14 counts the marks M in the next step 7" It is determined whether the number has reached the set value, and when the result is YES, the operation of the sewing machine is stopped in step S15.

On the other hand, if the determination result in step S13 is NO, the CPU 14 operates the feed change device 23 in step S16 to correct the cloth feed amount by the upper feed adjustment device 22 by a predetermined amount. Then, until the determination result in step S13 becomes YES, the steps
13 is executed repeatedly. In addition, the step S14
If the determination result is No, steps 311 to S13 are repeatedly executed until the determination result becomes YES.

As mentioned above, in this second embodiment, the marks attached to the two work cloths W at equal intervals are detected by each detector 17.
．． 24, and the operation of the upper feed adjustment device 22 is controlled based on the detection result, so that when sewing two pieces of work cloth W, the edges of both work cloths can be accurately matched. It is also possible to accurately join the handles at the ends.

Note that the present invention is not limited to the above-described embodiments; for example, the mark may be printed on the work cloth using magnetic ink, or a light emitting element and a light receiving element may be placed on the cloth feeding side of the detector. A fabric edge detector is installed, and after the fabric edge detector detects the edge of the fabric during trial sewing,
The configuration of each part may be changed as desired without departing from the spirit of the present invention, such as counting and storing the number of marks during sewing up to the edge and performing sewing based on the memorized count during resewing work. It is also possible to change to

(Effects of the Invention) As described in detail above, the present invention includes a stitch forming device that includes a needle that is moved up and down across a work cloth support surface and forms a stitch in a work cloth on the work cloth support surface. , a work cloth feed device that is operated in synchronization with the seam forming device and applies feed to the work cloth; marks attached to the work cloth at equal intervals; and marks on the cloth feed side from the needle drop point. a feed-out device which outputs a detection signal when the workpiece cloth is fed and faces the mark; and a feed-out device which operates at least one function of the sewing machine based on the count of the detection signal from the detection device. Since a control means is provided, it is possible to prevent misalignment of the two upper and lower workpiece cloths, misalignment of the joining position of the pattern, etc., or to reliably form a seam of a constant length. It has excellent effects.

[Brief explanation of drawings]

1 to 5 show a first embodiment embodying the present invention, in which FIG. 1 is a block diagram showing the electrical configuration of the invention, FIG. 2 is a front view of the sewing machine, and FIG. 3 is a partially enlarged plan view, FIG. 4 is a partially enlarged side view, and FIG. 5 is a flow chart. 6 to 8 show a second embodiment embodying the present invention, FIG. 6 is a diagram corresponding to FIG. 3, and FIG. 7 is a diagram corresponding to FIG. 4.
The corresponding diagram, FIG. 8, is a flowchart. In the figure, 5 is a needle, 7 is a work cloth support surface, 14 is a CPU as a control means, 17.24 is a detector, W is a work cloth,
M is a mark.

Claims (1)

[Claims] 1. A needle (5) that is moved up and down across the work cloth support surface (7).
), which forms a seam in the work cloth (W) on the work cloth support surface (7); a work cloth feeding device for imparting markings to the work cloth (W), marks (M) attached at equal intervals to the work cloth (W);
a detection device (17) that outputs a detection signal when facing the mark (M) as the sewing machine is fed, and actuation of at least one function of the sewing machine based on the count of the detection signal from the detection device (17). A sewing machine characterized by comprising: a control means (14) for controlling.