JPS6182784A - 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 Object of the Invention (Field of Industrial Application) The present invention relates to a playback sewing machine that is capable of performing regenerated sewing work based on sewing data stored in advance through trial sewing work.

(Prior Art) Conventionally, in this type of playback sewing machine, a trial sewing operation of sewing a piece of pocket cloth to a workpiece cloth is carried out, and sewing data such as the number of stitches required for sewing each edge part is stored. After that, when performing regenerated sewing work based on the sewing data, it is difficult to maintain the needle drop position of the first stitch constant with respect to the sewing start end of the pocket cloth piece for each regenerated sewing work. Therefore, at the end of sewing the memorized number of stitches along one side edge of the pocket cloth, the distance between the end of the sewing end of the pocket cloth and the needle drop position of the R final needle must be kept constant. was difficult. In other words, the count when sewing one edge of the pocket cloth was set based on the trial sewing work, and it was not increased or decreased.
If the sewing start position is not kept constant, it is naturally difficult to keep the N sewing end position constant, and it is even more difficult due to the elongation of the processed fabric and cutting errors, and the disadvantage is that the finished product of the sewn product varies greatly. was there.

Structure of the Invention (Means for Solving the Problems) In order to solve the above-mentioned problems, the present invention J5 uses a nail that is moved up and down across the work cloth support surface as the main shaft of the sewing machine rotates. a seam forming device for forming a seam on the work cloth on the working ray ff support surface; and a work cloth feeder for intermittently transporting the work cloth, which is operated in synchronization with the rotation of the sewing machine main shaft. A device, a feed adjustment device that can set the cloth feed by the work cloth feed device to reduce or change the cloth feed, and a feed adjustment device that can set the cloth feed by the work cloth feed device to reduce or change the cloth feed, and a feed adjustment device that allows the work cloth to pass between the ends of the work cloth or between the overlapping steps of the work cloth on the cloth feed side from the needle drop point. a synchronous signal generator that generates a signal synchronized with the rotation of the sewing machine main shaft; a needle detection device that detects the vertical position of the needle and generates a detection signal; After the detection signal is output from the storage means for storing cloth feed amount data corresponding to the rotation angle and the workpiece cloth edge detector, the cloth is moved up and down while the &1 manufacturing is performed up to the workpiece cloth edge or stepped portion. a counting means for counting the number of times the sewing machine needle is inserted based on the synchronization signal and the needle position detection signal, and comparing the rotation angle of the main shaft of the sewing machine from the detection of the work cloth to the next needle drop position with the cloth feed maximum data. a first control means for temporarily storing and setting the calculation data of the number of stitches and the cloth feed phrase during the trial sewing operation; The sewing operation is performed by comparing the feed skewer of the work cloth from the time of cloth detection to the next needle drop position with the memorized cloth feed m data, and controlling the increase/decrease of the stitch count data and the feed amount. 2 control means are provided.

(Function) With the above configuration, in this invention, counting and cloth feeding are performed from the detection of the end of the work cloth or the skewer joining step to the sewing up to that end or step during the trial sewing operation. Temporarily stores the extraction data of the world, and compares the amount of feed of the work cloth from the detection of the work cloth to the next needle drop position with the maximum cloth feed data set in memory as the regenerated sewing work is performed,
By controlling the increase/decrease in the number of stitches data and the feed m, the distance from the edge or stepped portion of the workpiece cloth to the nearest needle drop position can be kept substantially constant.

(Example) Hereinafter, an example of a sewing machine embodying the present invention will be described with reference to the drawings.

As shown in FIG. 3, arm portion 1a of sewing machine frame 1
A sewing machine main shaft 2 is rotatably supported on the main shaft 2, and a driven pulley 3 is mounted on the right end thereof.

As shown in FIG. 1, the belt 5 shown in FIG. It is transmitted to the sewing machine main shaft 2 via the driven pulley 3 and the like, and the sewing machine main shaft 2 is rotated. Figures 1 and 2
As shown in the figure, a needle bar 7 having a needle 8 at its lower end is supported on the arm portion 1a so as to be movable up and down, and the needle 8 is attached to the main shaft of the sewing machine.
Along with the rotation, the work cloth supporting surface 6 of the bed portion 1b is moved up and down. Then, the main h1 stitch is formed on the work cloth W on the work cloth support surface 6 by the cooperation of this needle 8 and a thread loop catcher (not shown) in the bed portion 1b. Note that the needle 8 and thread loop catcher constitute a stitch forming device.

Further, as shown in FIG. 8, the bed portion 1b is provided with a sliding plate 9 and a needle plate 1, which constitute a part of the supporting surface 6.
0 is attached, and the throat plate 10 has a side groove hole 11 through which the needle 8 passes and three feed dog openings 12 extending in the cloth feeding direction.
is formed. In addition, a feed dog 13 is provided in the head portion 1b to which the rotation of the sewing machine main shaft 2 coincides with the rotation of the sewing machine main shaft 2 and is provided with the well-known 4 feed movements +h. The workpiece cloth W on the workpiece cloth support surface 6 is fed to the arm portion 1a in correspondence with the feed dog 3.
3 is provided with a presser foot (not shown) for pressing,
Both constitute a work cloth feeding device for transporting the work cloth W.

As shown in FIGS. 1 and 2, a support case 14 located on the work cloth feeding side from the needle drop point is attached to the side surface of the arm portion 1a, and a light emitting element 15 is mounted inside the support case 14. is accommodated.

The lower end of the light projecting element 15 is covered by a transparent protection plate 16 fitted into the support case 14.

On the other hand, as shown in FIGS. 2 and 8, the needle droplet 11
A support case 17 is fixedly attached within the bed portion 1b on the cloth feeding side, and its upper portion is fitted into the throat plate 10. Inside this support case 17 is a light receiving element 18 for receiving light emitted from the light projecting element 15.
is accommodated. The upper end of the light receiving element 18 is covered with a transparent protection plate 17a fitted to the support case 17. The light emitting element 15 and the light receiving element 18 constitute a workpiece cloth edge detector 19, and the light receiving element 18
receives the light directly from the light projecting element 15, and also receives the light that passes through the work cloth W when the work cloth W is sent between them and the optical path is interrupted. The end portion or the overlapping stepped portion of two sheets of work cloth W is detected based on a change in the amount of light transmitted, and a predetermined signal is output.

As shown in FIGS. 3 to 5, on the left side surface of the driven pulley 3, there is a first reflecting plate 2 having an arc-shaped notch 20a on the outer periphery.
0 is attached by two screws 21. Further, a second reflecting plate 22 is attached between the outer peripheral edge of the first reflecting plate 20 and the side surface of the pulley 3 and is ring-shaped and has a notch 22a on the inner periphery. The notches 20a and 22a of each of the reflectors 20 and 22 are arranged at an interval of approximately 180 degrees, and the portion defined by the notches 20a and the inner periphery of the second reflector 22 is a non-contact area for detecting the recorded position. The surface of the first reflective plate 20 that forms the reflective surface 23 and is located concentrically with the non-reflective surface 23 constitutes the reflective surface 24 .

On the other hand, the notch 22a of the second reflecting plate 22 and the first reflecting plate 2
0 constitutes a non-reflective surface 25 for detecting the needle down position, and the surface of the second reflective plate 22 located concentrically with the non-reflective surface 25 constitutes the reflective surface 2.
6. Further, on the surface of the second reflection plate 22 outside the notch 22a, non-reflection surfaces 27 and reflection surfaces 28 for generating a domei signal (timing pulse) are formed alternately at predetermined angular intervals. There is.

A support body 31 is mounted within the arm portion a by three screws 30 via a mounting plate 29 so as to be located on the outer periphery of the main shaft 2 of the sewing machine in close proximity to each of the reflectors 20, 22.

This support body 31 has a detector 32 for detecting the measured position facing each non-reflective surface 23, 25, 27. A detector 33 for detecting the needle down position and a detector 34 for detecting the rotation angle are respectively installed. Each detector 32 to 34 is a light emitting element 32
Consisting of a to 34a and light receiving elements 32b to 34b,
When the driven pulley 3 rotates, each light emitting element 32a
The light emitted from ~34a is reflected by each reflective surface 24, 26, 28, and absorbed by each non-reflective surface 23, 25, 27. When reflected light is incident on each of the light receiving elements 32b to 34b, each detection 1ff 132, 34 outputs a predetermined signal, and when no reflected light is incident, it does not output the signal.

Next, the lower portion of the feed adjustment device will be explained according to FIGS. 6 and 7. An eccentric cam 40 is attached to the main shaft 2 of the sewing machine, and a switch 42 operatively connected to a horizontal feed shaft (not shown) is rotated on a shaft 41 extending parallel to the main shaft 2 of the sewing machine below the arm portion 1a. It is movably supported. The eccentric cam 40 is connected to a switching device 42 by a crank rod 43. A feed adjustment shaft 44 extending parallel to the main shaft 2 of the sewing machine is disposed within the arm portion a below the main shaft 2 of the sewing machine. A feed adjuster 45 is rotatably inserted and supported in the feed adjustment lll1k44 at approximately the center thereof, and is urged to rotate clockwise in FIG. 6 by a spring (not shown). This feed regulator 45 is connected at its rear end to the switching device 42 by a connecting rod 47. Also, this feed adjuster 4
A feed control cam 46 is formed on the front end surface of 5. A manual adjustment member 48 extending toward the surface of the arm portion 1a is rotatably screwed at its intermediate threaded portion 49, and an operating knob 50 is provided at the bent end of the manual adjustment member 48 so as to be located on the surface of the arm portion 1a. is attached, and an engagement protrusion 51 that engages with the feed control cam 46 is formed at the rear end of the manual adjustment member 48 . And operation knob 5
By moving the manual adjustment member 48 back and forth based on the rotation operation of 0, the inclination angle of the feed adjuster 46 is changed and adjusted through the engagement between the engagement protrusion 51 and the feed control cam 46, and based on this, the cloth feed is adjusted. The amount can be changed and set.

On the outer surface of the operation knob 50, there is an O for adjusting the amount of cloth feeding.
-5 numbers 52 are attached on concentric circles. A feed reduction cam 53 for reducing the preset cloth feed Φ by half is fitted and fixed to the rear end of the manual adjustment member 48, and the outer peripheral surface of the feed reduction cam 53 has the number 52. A cam surface 54 is formed whose height from the center increases in the same direction as the direction in which the height increases.

An actuating member 56 is rotatably supported on the feed adjuster @44 adjacent to the feed adjuster 45, and an engaging protrusion 57 that can engage with the cam surface 54 protrudes from the upper end of the actuating member 56. At the same time, an engagement pin 58 that can be engaged with the lower surface of the feed adjuster 45 is protruded from the lower part thereof. A rotary solenoid 59 is disposed below the operating member 56, and a connecting rod 61 is fixed to an operating shaft 60 of the rotary solenoid 59.

The upper end of the connecting rod 61 is operatively connected to the lower part of the actuating member 56 by a connecting link 62. When the rotary solenoid 59 is in a non-energized state, the actuating member 58 is placed in the privileged position shown in FIG. They are arranged at positions separated from the feed reduction cam 53 and the feed adjuster 45, respectively.

On the other hand, when the mouth/tally solenoid 59 is energized, the operating shaft 60 is rotated clockwise in FIG. The feed adjuster 45 is engaged with the lower surface of the feed adjuster 45, and after the engagement, the actuating member 56 and the feed adjuster 45 rotate integrally until the engagement protrusion 57 of the actuating member 56 is engaged with the feed reduction cam 53. be moved. Based on the rotation of the adjuster 45, the connecting rod 47 and the switch 42 are operated, and the cloth feed amount is set to one half of the cloth feed m preset by the operation knob 50.

Next, a control circuit diagram of the sewing machine in this embodiment will be explained with reference to FIG. In the figure, 63 is a central processing unit (CPU), and the CPU 63 is the counting means 6.
4. Calculation means 65. It includes a first control means 66 and a second control means 67. The operation pedal 68 serves both as a sewing machine start switch and a sewing machine stop switch, and when a drive signal is input to the CPU 63 based on the pedal's depression, the CPU 63 outputs a drive signal to the motor 4.

Further, when a stop signal is input to the CPU 63 from the sewing machine stop switch due to release of the operation pedal 68, the CPU 63 outputs a stop signal to the motor 4. An operation panel 69 is provided on the front surface of the arm section a of the sewing machine frame 1, and a memory key 70 b<6 above the operation panel is provided.
When operated, the CPtJ 63 sets the storage mode, and when the playback key 71 on the operation panel 69 is operated, it sets the playback mode.

Here, the storage mode is a mode for storing sewing data to be described later in the RAM 73 along with trial sewing work, and the reproducing mode is a mode for performing regenerated sewing work based on the sewing data stored in the RAM 73. mode.

The CPU 63 has a random access memory (RAM) 7
3 and a read-only memory (ROM) 72, the ROM 72 stores a program for controlling the operation of the entire sewing machine, and also stores programs for controlling the operation of the sewing machine as a whole, as shown in Fig. 10. The cloth feed data is stored.

After the detection signal is output from the workpiece cloth edge detector 19, the counting means 64 calculates the number of times the needle 8 is moved up and down during the sewing up to the workpiece cloth end or step, and calculates the number of times the needle 8 is moved up and down during the sewing up to the workpiece cloth edge or step. Counting is performed based on the synchronization signal output from the detector 34 and the needle-up position detection signal output from the counting position detection detector 32.

On the other hand, the squeezing means 65 detects the rotation angle of the main shaft 2 of the sewing machine from the detection of the work cloth to the next needle drop position, that is, the output of the needle bottom position detection signal from the needle bottom position detection detector 33. The rotation angle is measured by counting the same signal and the rotation angle is determined by counting the same signal.
It compares it with the cloth feed finger data stored in the OM 72 and calculates the feed m of the feed fiW during that time. Further, the first control means 66 temporarily stores and sets the calculation data of the number of stitches and the cloth feeding field in the RAM 73 in the storage mode.

The second control means 67 controls the feed rate of the work cloth W from the detection of the work cloth to the next needle drop position and the cloth feed hanging data in the RAM 73 stored and set by the first control means 66 in the reproduction mode. The sewing operation is performed by comparing the above data and controlling the increase/decrease of the counting data and the feed river.

Next, the operation of the playback sewing machine constructed as described above will be explained with reference to FIGS. 12 and 13.

Now, when trial sewing is to be performed along the side edge of the work cloth W shown in FIG. 8, the memory key 70 is first operated to set the memory mode while the sewing machine is powered on. ``Then, in step S1, the operator depresses the operating pedal 68 to actuate the sewing machine star upper switch and inputs a predetermined signal to the CPU 63, and in step S2, the motor 4 is rotated and the sewing machine is operated.

Then, based on the operation of the sewing machine, a stitch is formed along the side edge of the workpiece cloth C, and the cloth is transferred in the cloth feeding direction, and the end part is subjected to force II, -, [: A5 Stew detector 1 When the light passes between two light emitting/receiving elements 15 and 16, the result in step S3 becomes YES and the process proceeds to the next step S4. In this step S4, counting of synchronization signals output from the rotation angle detection detector 34 is started, and in the next step S5, the needle down position detection signal is output from the button down position detection detector 33 to CP.
The synchronization signal is counted until it is input to LJ 63. Then, the count number (memorized in the ROIVI 72 based on the rotation angle Δ) is compared with the cloth feed ω data as shown in FIG. 10, and the feed of the work cloth W shown in FIG. Equally ratio the suspension m. In addition, Section 8.9
White circles and black circles in the figure indicate needle drop positions before and after stitch formation. Then, the calculated data is temporarily stored in the RAM 73. Next, step S8 and step S
At step 9, the number of stitches from when the edge of the work cloth is detected until the sewing machine is stopped from being sewn to that edge is counted based on the counted position detection signal. Then, in step S10, the number of stitches NlfiRAM73 is temporarily stored. In this way, during trial sewing work, the number of stitches N required for sewing from the detection of the edge of the workpiece fabric to the next needle drop position is the feed value m of the workpiece fabric W from the detection of the edge of the workpiece fabric to the next needle drop position. is stored as Ell data.

Next, the first regeneration sewing work based on the sewing data will be described.
This will be explained according to Figure 3. First, with the playback mode set based on the operation of the playback key 71 shown in FIG.
3 outputs a drive signal to the motor 4, step 312
The sewing machine starts operating. After steps 813 to 315 are performed, which are similar to steps 82 to S5 during the trial sewing operation, in step 317, the process is performed from the detection of the edge of the workpiece cloth to the input of the next needle lower stomach detection signal. Processing cloth feed lx (see Figure 9.10)
is calculated and stored in the RAM 73.

Next, in step 818, the CPU 63 determines whether the double feed M... during the trial sewing work is equal to or greater than the double feed ♀X during the regeneration sewing work, and if the result is YES, the CPU 63 advances to step S19. It is determined whether the difference between double feed 1m and double feed @X is 75% or more of the feed amount for one stitch. If the result is YES, step S
In step 20, the number n of stitches during the regenerated sewing operation after detecting the edge of the work cloth is set to N+1. That is, one additional stitch is added to the number of stitches N during the trial sewing operation.

On the other hand, the determination result in step S19 is N.

If so, the process proceeds to step 821, and the CPU 63 determines that the difference between double feed 1m and double feed overturned is 25% or more and 75%.
If the result is YES, in step 822, the numerical number n is set to N+0.5. Further, if the determination result in step S21 is No, the number of stitches n is set equal to the open number N in step S23.

Roughly speaking, if the determination result in step 318 is No, the process proceeds to step 824, where it is determined whether the difference between the double feed amount x and double feed mm is 75% or more, and the result is YES. If so, the CPU 63 sets the number of stitches n to N-1 in step S25. On the other hand, if the determination result in step S24 is No, then in step S26 the double feed
It is determined whether the difference with m is 25% or more and less than 75%, and if the result is YES, step 827
The number of stitches n is set to N-0.5.

If the determination result in step S26 is No, the number of stitches n is set equal to the number of stitches N in step 828.

As described above, after setting the number of stitches n after detecting the edge of the work cloth based on the comparison between the heavy feed amount m during the trial sewing work and the double feed lx during the regeneration sewing work, step S29
Then, sewing of an integral number of stitches among the number n of ε1 is performed.

Then, in step S30, during the number of stitches n, O15
It is determined whether or not it is included. If the result is YES, that is, if the feed for 1/2 pitch is 6 steps, in step S31, the CPU
63 outputs a drive signal to the rotary solenoid 59 of the feed adjustment device. Based on this, the rotary solenoid 59 is energized, and its operating shaft 60, connecting rod 61 . When the actuating member 56 is rotated counterclockwise in FIG. 6 about the feed adjustment shaft 44 via the connecting link 62, its engagement protrusion 17 is engaged with the cam surface 54 of the feed reduction cam 53. . Therefore, the feed amount previously adjusted based on the turning/cutting operation of the manual adjustment member 48 is reduced to one-half, and the feed equivalent to one-half pitch is given to the workpiece cloth C as the sewing machine operates. , only one stitch is sewn.

On the other hand, if the determination result in step 330 is NO, the rotary solenoid 59 will not be energized, and therefore the feed reduction operation will not be performed. Thereafter, in step 832, the sewing machine is stopped.

As mentioned above, in this embodiment, each double feed of 1 m after detecting the end of the workpiece cloth during trial sewing work and regeneration sewing work
By comparing , be able to.

Note that the present invention is not limited to the above-mentioned embodiments, and for example, the feed reduction amount may be set to a value other than 1/2,
Steps S19°821 and S24.82 shown in FIG.
It is also possible to set the discrimination reference value in No. 6 to a value other than 75% and 25%. Furthermore, when sewing pocket cloth pieces, the overlapping stepped portions are detected by changing the thickness sensitivity of the workpiece cloth detector 19, so the same recycled sewing work as in the above case is performed. be able to.

Effects of the Invention As detailed above, the present invention is capable of adjusting the feed amount of the work cloth from the time the work cloth is detected during the regenerated sewing operation to the next needle drop position, and the cloth feed data stored and set during the trial sewing operation. By comparing the data and controlling the increase/decrease in the number of stitches and the feed during the trial sewing work, we performed the recycled sewing work, so even if the starting position of 81 of the processed fabric shifts slightly for each recycled sewing work, ,
This provides an excellent effect in that the distance from the edge or stepped portion of the workpiece fabric at the sewing end position to the needle drop position of the final needle can be kept constant.

[Brief explanation of the drawing]

Fig. 1 is a diagram embodying the present invention (without showing the appearance and control circuit of the playback sewing machine), Fig. 2 is a partially enlarged front sectional view showing a processed material edge detector, and Fig. 3 is a separate position detector. FIG. 4 is a partially enlarged front sectional view showing IV- in FIG. 3.
5 is a sectional view taken along line V-V in FIG. 3, FIG. 6 is an enlarged side sectional view showing the feed adjustment device, FIG. 7 is a partial perspective view, and FIG. 8 is a trial sewing operation. 9 is a partial plan view of the sewing machine during regeneration sewing work, FIG. 10 is a diagram without needle vertical movement curves and feed amount curves, and FIG. 11 is a time chart, FIG. 12 is a flowchart during trial sewing work, and FIG. 13 is a flowchart during regeneration sewing work. In the figure, 2 is the main shaft of the sewing machine, 6 is the workpiece cloth support surface, 8 is the button, 13 is the feed dog, 19 is the workpiece cloth edge detector, 32 is the needle upper position detector, and 33 is the needle lower position detector. , 34 is a rotation angle detection detector constituting a device for generating a synchronization signal, 64 is a counting means, 65 is a calculation means, 66 is a first control means, 67 is a second control means, 72 is a ROM, T is a feeding device, and W is a work cloth. Patent applicant: Branagh Industries Co., Ltd. Representative
Person Patent Attorney On 1) Hironobu Figure 1/-11111--11--\ Needle position detection signal■]-

Claims (1)

[Claims] 1. As the sewing machine main shaft (2) rotates, the work cloth support surface (6
), the stitch forming device includes a needle (8) that is moved up and down across the workpiece fabric support surface (6) and forms a stitch in the workpiece cloth (W) on the workpiece cloth support surface (6); and rotation of the sewing machine main shaft (2). a work cloth feeding device that is operated in synchronization with the work cloth (W) to intermittently transport the work cloth (W); and a feed adjustment device ( T), a workpiece cloth edge detector (19) for detecting passage of the end of the workpiece cloth (W) or the overlapping stepped portion of the workpiece cloth (W) on the cloth feed side from the needle drop point, and the sewing machine main shaft. (2); a synchronizing signal generating device (34) that generates a signal synchronized with the rotation of the needle; a needle detecting device (32, 33) that detects the vertical position of the needle (8) and generates a detection signal thereof; Storage means (7) for storing cloth feed amount data according to the rotation angle of the main shaft (2)
2) After the detection signal is output from the workpiece cloth edge detector (19), the number of times the needle (8) is moved up and down during the sewing up to the workpiece cloth edge or step part is calculated according to the synchronization method. a counting means (64) that counts based on the signal and the needle position detection signal, and a rotation angle of the sewing machine main shaft (2) from the detection of the workpiece cloth to the next needle drop position and the cloth feed amount data for processing. a calculation means (65) for calculating the amount of feed of the cloth (W); a first control means (66) for temporarily storing and setting the calculation data of the number of stitches and the amount of cloth feed during trial sewing work; During the sewing work, the feed amount of the work cloth (W) from after the work cloth detection to the next needle drop position is compared with the cloth feed amount data stored and set, and the increase/decrease in the number of stitches data and the feed amount are calculated. a second control means (67) to control and perform sewing work;
) A playback sewing machine characterized by comprising: