JPS6222686A - Constant dimension stitching apparatus in 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 (Industrial Application Field) This function corrects the actual cloth feed hanging on the feed dog for each stitch to match the set cloth feed pitch! together with g
Stop the main shaft of the sewing machine when the sewing of the number of Q treasures is completed 1-
This is a sewing machine with a configuration of 1 degree that can carry out regular cutting stitches.

((, 1 bundle technology) Conventionally, this type of sizing sewing equipment ■ detects the count from the beginning of sewing to the end of sewing, and determines that the number of stitches is 1, which corresponds to a predetermined sewing quality. There is a known construction in which the main spindle of the sewing machine is stopped when the sewing machine coincides with the sewing machine.

(Problem to be Solved by the Invention) However, in general, when a sewing machine is operated at high speed, the responsiveness between each component in the feed mechanism decreases due to inertia, and the stitch pitch decreases compared to when operating at low speed. The culm grows by 10-15%. Therefore, J, Rudo, conventional fixed/single stitching devices
Although sewing was performed according to the setting ε1, there was a problem in that the actual sewing quality did not exactly match the required sewing length.

Structure of the Invention (Means for Solving the Problems) This invention has been made in order to solve the above-mentioned problems, and the means for solving the problems is as shown in FIG. A stitch forming mechanism including a button 5 that is moved down by a button 5, a feed dog 10 that intermittently transfers the workpiece cloth in accordance with the four-feed movement, a feed table 8, and a horizontal feed shaft 6 that includes a horizontal A horizontal feed mechanism that causes the feed dog 10 to move in the horizontal direction as the feed shaft 6 swings; A bind-off generator 44 that generates a synchronized signal, and pitch y'iQ constant means 30 and 31 that set the double feed bits per sword.
, pitch changing means 38 capable of changing the cloth feed pitch by changing the amount of rocking of the horizontal feed shaft 6, and stitch number setting means 4.
9 and the one number detection means 50 change the pitch so that the signal output from the generator No. 18 44h+ with one swing of the horizontal feed shaft 6 matches the signal corresponding to the set cloth feed pitch. In addition to controlling the operation of the means 38, the main shaft 2 of the sewing machine is stopped when the detected number of stitches matches the set number of layers.

(Function) Therefore, in the fixed size sewing device of the present invention, a signal that corresponds extremely accurately to the actual cloth feeding interval is output from the feed distribution signal generator 44, and the signal corresponds to the set cloth feeding pitch. The pitch changing means 38 is operated based on the comparison value, and the cloth feed pitch for each sword is corrected to match the set value, and the needles are adjusted to match the set value. When the number of stitches has been completed, the rotation of the main shaft 20 of the sewing machine is stopped, thereby performing constant cutting with stitching quality that exactly matches the required line length.

(Example) Below, an example that embodies this Jff light is shown in the first to
This will be explained according to Figure 6.

In FIG. 1 (oral support L1.), a J sewing machine main shaft 2 is rotatably supported in an I-arm part a of a sewing machine frame 1, and a pulley 3 is attached to its right end. Sewing machine = 5 - An IJ and II support 4 is supported on the arm portion 1a of the frame 1 so that it can move downward, and a needle 5 is attached to the lower end of the IJ.

+n+I A motor 13 is installed below the bed portion 1h of the sewing machine frame 1 constituting the fabric support surface, and the bells 1 to 1
5 is connected to the above-mentioned -3.

As the main shaft 2 of the sewing machine is rotated by the drive of the motor 15, the nails 5 are moved up and down through the bed 1b as well as the fabric (not shown). A lock stitch is formed on the workpiece cloth in cooperation with the thread loop catcher. Therefore, the nail 5
A seam forming mechanism is constituted by a thread loop catcher and the like.

As shown in FIG. 2, within the bed portion 1b of the sewing machine frame 1, a horizontal feed shaft 6 and a vertical feed shaft 7, which extend parallel to each other in the left-right direction, are rotatably supported. At the left end of the horizontal feed shaft 6, an X-mount 8 is rotatably supported via a support arm 9, and a 1-meter ridge 10 that can be retracted from one side of the bed portion 1h is attached to its upper surface. ing. A two-pronged arm 11 is attached to the left end of the vertical feed shaft 7,
By rotating the vertical feed #I7 () backwards,
The feed dog 10 is moved four times and the bed portion 11+-
1- Addition] - Intermittent feeding in the horizontal direction is applied to the cloth.

That is, as shown in FIG. 3, the sewing machine main shaft 2 is equipped with an eccentric cam 12 for horizontal Jl cutting, and a crank rod 14 is engaged with one end of the eccentric cam 12. . 1+i, t for the crank rod 14
An 11 feed changeover device 16 is rotatably supported on a support shaft 17 within a bed portion 11) of the sewing machine frame 1. Between the rear ends of the feed switching device 16, a rotary collar 18 is connected to the support bin 1.
9, and its front end is rotatably connected to the lower end of the crank rod 14 by a connecting pin 20.

A connecting arm 21 is fixed to the horizontal feed shaft 60 behind the JZ switching device 16, and a connecting rod 22 connects the shaft 23 and Mr+ between the upper end of the arm and the front end of the rotary lever 18. It is interposed with a pin 20.

Then, by adjusting the rotation of the feed switching device 160, the support 1! I
When the eccentric cam 12 for horizontal feeding is rotated with the pin 19 set at a predetermined position, the rotating lever 18 is moved downward (9) around the support bin 19 via the crank rod 14. The connecting arm 2 is rotated through the connecting rod 22 according to the set position of the support bin 19.
A rotational force in the front-back direction is applied to the horizontal feed shaft 6, and the horizontal feed shaft 6 is swung within a predetermined range. Therefore, the horizontal feed mechanism of this embodiment is composed of the horizontal feed shaft 6, the feed stand 8, the crank rod 14, the feed switch 16, etc., and as the horizontal feed shaft 6 swings, the feed rod 10 is moved in the horizontal direction. The motion is now given.

In addition, the previous Zil! An eccentric cam (not shown) for vertical feeding is attached to the main shaft 2 of the sewing machine, and a crank rod for vertical feeding is connected between the eccentric cam and the marine vertical feeding shaft 7. Therefore, as the vertical feed shaft 7 is reciprocated within a predetermined range via the crank rod as the eccentric force l\ for vertical feed rotates, the vertical feed shaft 7 is rotated vertically to the feed dog 10 via the feed table 8. 2r so that the movement in the direction is f=1.

As shown in Fig. 4, a feed adjustment member 25 is rotatably supported within the arm portion a of the sewing machine frame 1, and is rotated by a spring (not shown).
The f meter is rotated in the direction of lj, and there is a
．． An IV-shaped feed control cam 27 is formed. A connecting rod 28 is rotatably attached to the rear side of the feed adjustment member 25 by engaging a screw 29 at the upper end thereof, and the lower end of the connecting rod 28 is rotatably attached to the rear side of the feed adjusting member 25.
It is rotatably connected to a support bin 19 on the front delivery switch 16 as shown in the figure. Further, as shown in FIG. 4, a tJ manual operation member 30 is screwed onto the arm portion 1a of the sewing machine frame 1 in front of the feed adjustment member 25, and a feed control cam of the feed adjustment member 25 is connected to the inner end of the tJ manual operation member 30. A retainer #1 portion 32 is provided to engage with the feed adjustment member 27 and to restrict and hold the feed adjustment member 25 at a predetermined position against the action of the spring.

The feed adjusting member 25 is always controlled by the action of the spring.
is located at the J position shown by the solid line in FIG. 4, and the connecting rod 28
is pushed down, and as shown in FIG. 3(a), the feed switching device 16 is disposed in a lower rotating device with a large cloth feed pitch. Therefore, in this state, when the feed adjustment portion (Δ25) is rotated counterclockwise as shown by the chain line in FIG. 4 against the action of the spring by rotating the manual operating member 3o, the connecting rod 28, the feed switching device 16 is rotated in the 81 direction as shown in FIG. The hole feed pitch becomes smaller as the straight line connecting the connecting bin 2o and the axis of the shaft 23 approaches -1, and as shown in FIG. The cloth feeding direction is reversed when the cloth is moved in the E direction.

On the other hand, as shown in FIG. 4, an annular magnet body 24 is attached to the back surface of the operating portion 30a of the manual operating member 30. A pitch detector 3 made of a Hall element is disposed in front of the arm portion 1a of the sewing machine frame 1 so as to face the magnet body 24.
1 is embedded, and when the manual operation member 3o is rotated, a signal corresponding to the amount of rotation operation is outputted from the pitch detector 31, and the signal is increased by +2 to the hole feed pitch per stitch. is now detected. fI1, the f motion operating section +430 and the pitch detector 331 constitute pitch setting means.

As shown in FIG. 2, the upper part of the feed changer 16 is extended to the right in the arm part a of the sewing machine frame 1.
A fourth operating shaft 34 is rotatably supported, and an operating lever 37 exposed to the outside of the arm portion 1a is attached to the right end thereof. Further, a 1,1 operating arm 35 is fixed to the left end of the operating shaft 34, and the rear end is connected to the screw 36 by the connecting rod 28.
It is rotatably connected to the middle part of. When the operating shaft 3/I is rotated clockwise in FIG. 2 by pressing the operating lever 37, the front delivery switch 16 is rotated via the operating arm 35 and the connecting rod 28 as shown in FIG. As shown in (C), it is rotated to the reversal position and the cloth feeding direction is reversed.

Furthermore, a servo solenoid 38 is disposed in the arm portion a of the sewing machine frame 1 behind the operating shaft 34, and the front end of the armature t39 is connected to the operating shaft 34 through a connecting body 40.
is operatively connected to. A pitch changing means according to this embodiment is constructed in this +1-Bollenoid 38, and as the armour-fI-39 moves forward l\, the operating shaft 34 changes to 31 as shown in FIG. When the feed switch 16 is rotated by a predetermined amount in the direction shown in FIG. The reduction is corrected.

On the other hand, a detection target piece 42 having a large number of slits 41 is fixed to the horizontal feed shaft 6-to between the feed table 8 and the feed switching device 16, and a detection target piece 42'! ″Compatible L/T side′-′ Machine frame 1+7) Sy side part 1
A photointerrupter 43 is provided within 1h.

- Then, the detected piece 42 and the photointerrupter 43
L constitutes a signal generator 44, and the horizontal feed shaft 6
It is arranged so that a signal with a number of pulses corresponding to the fluctuation ω of the waveform is outputted.

Further, as shown in FIG. 1, a needle position detector 50 consisting of a light emitting and light receiving element is mounted on the arm portion 1a facing the pulley 3.
is installed, and a reflector 33 is installed on the pulley 3.
This reflector 33 has signals for a timing signal for reflecting the light from the light emitting element and dividing it into the light receiving element, for a sword upper position detection signal, and for a needle lower position detection signal. The light reflecting portions are formed at predetermined angular intervals.

Then, when the needle position detector 50 detects the reflected light from each light reflecting section for the counting and needle down position detection signals, the needle position detector 50 outputs a set down signal and a set down signal, which will be described later, at different timings.
The signals are output to the IJ 46, and the CPU 46 detects the number of vertical movements of the sword 5 based on these signals. Therefore, the nail position detector 50 and the CPU 46 constitute a piece number detection means.

Next, the control circuit of the sewing machine in this embodiment will be explained based on FIG. A central processing unit (
A start switch 48 . The number of stitches setting key 49, the signal generator 44, the pitch detector 31, and the needle position detector 5
0 is connected. The number of stitches setting-1-49 is configured using a numeric keypad or the like on an operation panel 45 (see FIG. 1) provided in front of the arm portion 1a of the sewing machine frame 1.

A drive solenoid 55 is connected to the output interface 52 for connecting and disengaging the crutch mechanism BQLJ in the drive transmission system between the motor 13 and the main shaft 2 of the sewing machine, and also controls the cloth feed pitch. The ribo solenoid 38 for modification is connected.

Furthermore, the CPU 46 includes a random access memory (RA).
M) 53 and read only memory (ROM) 54 are connected. The ROM 54 contains a program for controlling the entire sewing machine. The RAM 53 stores set cloth feed pitch data set by operating the manual operation member 30 and detected by the pitch detector 31, and a predetermined number of sets set by operating the 11 number setting key 49.

data is stored. Then, CPtJ46 corresponds to the cloth feed rate per stitch outputted by the signal generator 44 in accordance with one swing of the horizontal feed shaft 6, and the set cloth feed rate outputted by the pitch detector 31. 1), the number of up and down movements of It 5 is added based on the sword and assembly signals output from the front 1 position detector 50 from the start of sewing, and the addition value and the set stitch number data match. l: When the drive solenoid 55 outputs a drive command () to the sewing machine main shaft 2.
Stop the rotation! It has become so.

Next, the action of the sewing machine configured as
Figure (explained according to this figure)

Now, to start sewing, the required cloth feed pitch is set by operating the manual operation member 30, and
When the predetermined 11 numbers are input and set by the operation of II number & Q constant j-49, in step S1 43, the 1 set cloth feed pitch data detected by the pitch detector 31 and the set stitch number data are input. is stored in r<A M 53. Next, in step S2, the operation of the nFi switch 9-1 is confirmed, and sewing is performed with the needle 5 as the sewing machine main shaft 2 rotates, and as the horizontal feed shaft 6 swings, the 3'li tooth 10, it is determined whether or not the assembling signal outputted by the stellar unit 50 and the next assembling signal do not match the starting data, and if they do, the process returns to step S3. N stitching of the next stitch is executed using the same cloth feed pitch as that of the preceding set.

By the way, when the sewing machine is operated at high speed, the responsiveness of the feed mechanism decreases and the cloth feed pitch elongates, and the cloth feed pitch of the preceding needle does not match the set cloth feed pitch data. , the process advances from step S5 to step S6, and the servo solenoid 38 is driven by a signal with a pulse number based on the difference between both data. As shown in FIG. 2, the horizontal feed shaft 6 rotates in the direction of decreasing the cloth feed amount via the operating shaft 34, the operating arm 35, the connecting rod 28, and the feed switching device 16. Then, the cloth feed pitch in the feed direction 10 is corrected to be reduced.

In step S7, the number of pulses for the reduction output by the signal generator 44 as the horizontal feed shaft 6 rotates during the reduction correction is multiplied by 8!1 from the number of pulses corresponding to the cloth feed amount of the preceding needle. . Subsequently, in step S8, it is determined whether or not the subtracted value matches the set cloth feed pitch data, and the above-described correction operation is executed until they match.

When the cloth feed pitch is corrected to the set value by the operation of the servo solenoid 38, the process proceeds to step 89, where it is determined whether or not the number of sets from the start of sewing matches the set number of stitches. The process returns to S3, and the next needle is made of It and the above-described correction process is repeated. On the other hand, when the sewing that matches the set number of sets is completed, the process proceeds to step 810, and the needle-down position of the nail 5 is confirmed based on the assembling signal from the needle position detector 50, and then, in step 811, the driving solenoid 55 is activated. The clutch mechanism is disengaged and the rotation of the main shaft 2 of the sewing machine is stopped.

Note that the present invention is not limited to the configuration of the above-mentioned embodiment. For example, as shown in FIG. While fixing the provided detection piece 59,
A Hall element 60 is placed in the bed portion 1b so as to face the detected object 59! The signal generator 44 may be configured by both 59 and 50, as shown in FIG.
A detection plate 62 having a large number of slits 61 is fixed to one side of the feed table 8 so as to extend along the longitudinal direction of the feed table 8, and light emitting/receiving elements 63 and 64 are arranged to sandwich the detection plate 62. However, the configuration of each part may be arbitrarily changed without departing from the spirit of the present invention, such as configuring the signal generator 44 with these 62° 63.64, or configuring the signal generator 44 with other linear encoders, etc. It is also possible to make it more concrete by changing it to .

Effects of the Invention - [As described in detail, according to the present invention, the signal generator is provided on the horizontal feed shaft or the feed base, and even when the sewing machine is operated at high speed, the signal generator does not cause the feed dog to Corresponds extremely precisely to actual fabric feeding and hanging! 16 signal is output, so that signal matches the set hole feed pitch data.J: By operating the pitch changing means and changing the fabric feed pitch for each stitch, the stitch pitch is adjusted according to the set value. This provides an excellent effect in that a good stitch without pitch unevenness or disturbance in thread tightness can be formed, and fixed-size stitching of 0 length that accurately matches the required sewing size can be performed.

[Brief explanation of drawings]

FIG. 1 is an explanatory diagram of the configuration of the present invention. 2 to 6 show an embodiment embodying the present invention, and FIG. 2 is a perspective view showing horizontal feed am. Figure 3(a). (b) and (C) are vertical cross-sectional views of the adjustment configuration of the futon feeder, Figure 4 is a partial side cross-sectional view of the sewing machine, Figure 5 is a control circuit diagram, and Figure 6 is a diagram of flowchart 1. It is. 7 and 8 show the signal generator according to the present invention cut down, with FIG. 7 being a plan view and FIG. 8 being a longitudinal sectional view. In the figure, 1 is the sewing machine frame, 11) is the bed part that constitutes the work cloth support surface, 2 is the main shaft of the sewing machine, 5 is the button, 6 is the horizontal feed axis, 7 is the vertical feed axis, (S is the feed stand, 10) 1 is a feed dog, 13 is a motor, 16 is a feed switch, 25 is a feed adjustment member, 30 is a manual operation member, 31 is a pitch detector, 38 is a pitch changing means, and is a bossolenoid; 44 is a signal valve (l); 46 is a CPU as a control means, 49 is a set number setting 4--153 is a RAM, and 54 is a ROM.

Claims (1)

[Claims] 1. As the sewing machine main shaft (2) rotates, the work cloth support surface (1b
) includes a needle (5) that is moved up and down across the workpiece cloth support surface (1b) and forms a seam on the workpiece cloth on the workpiece cloth support surface (1b); feed dog (1
0), a feed bar (8) that supports the feed dog (10), and a horizontal feed shaft (6) that supports the feed bar (8) and swings with the rotation of the sewing machine main shaft (2). ), which imparts horizontal movement to the feed dog (10) as the horizontal feed shaft (6) swings; and a horizontal feed mechanism provided on the horizontal feed shaft (6) or the feed base (8). , a signal generator (44) that generates a signal synchronized with the horizontal movement of the feed dog (10), and a pitch setting means (3) that sets the cloth feed pitch per stitch.
0, 31), which is operatively connected to the horizontal feed mechanism and changes the amount of swing of the horizontal feed shaft (6) during sewing.
pitch changing means (38) capable of changing the cloth feeding pitch;
, a stitch number setting means (49) for setting a predetermined number of stitches, a stitch number detector stage (50) for detecting the number of vertical movements of the needle (5) during sewing work, and the horizontal feed shaft (6). ), controlling the operation of the pitch changing means (38) so that the signal output from the signal generator (44) in response to one swing of the pitch matches the signal corresponding to the set cloth feeding pitch; The number of stitches detecting means (
50) Control means (46) for controlling the sewing machine main shaft (2) to be stopped when the number of stitches detected by the method (50) matches the set number of stitches. sewing device.