JPH041904Y2 - - Google Patents

Description

[Detailed description of the invention] (Industrial application field) This invention includes a feed dog for imparting feed to the work cloth on the work cloth support surface, and a feed dog for changing and setting the amount of cloth feed by the feed dog. The present invention relates to a sewing machine equipped with a switching device and the like, and particularly to a feed display device thereof.

(Problems to be Solved by the Prior Art and Ideas) In conventional sewing machines, when checking the stitch feed pitch, the user looked at the scale of the feed adjustment dial attached to the front of the arm of the sewing machine.

However, since the assembly accuracy of the feed adjustment dial and the parts constituting the feed mechanism differs from sewing machine to sewing machine, there is a problem in that it is not possible to determine the accurate feed pitch common to each sewing machine from the scale.
Therefore, for example, when sewing with a predetermined number of stitches and a predetermined stitch length using multiple sewing machines, the scale and the dimension measured from one stitch actually sewn may be As compared, it was necessary to perform the troublesome work of adjusting the feed pitch.

(Purpose of the invention) In order to solve the above problems, the inventors
We devised a configuration that detects the actual feed pitch that is changed by operating the feed adjustment dial and displays that value. In other words, sewing machines are generally equipped with a feed changer that can change the amount of swing of the horizontal feed shaft that generates the horizontal movement of the four-movement feed of the feed dog, and the rotational position of the feed changer can be adjusted by rotating the feed adjustment dial. The feed pitch is configured to be changed and adjusted by changing it by a dynamic operation. Therefore,
The rotary position (angle) of this feed switching device is detected by a potentiometer, and the feed pitch value is displayed in accordance with the detected value.

Although the above-described configuration makes it possible to accurately display the feed pitch, the following problem was discovered. In other words, since the feed pitch value is displayed according to the detection signal (voltage) of the potentiometer, when assembling the potentiometer into the sewing machine frame, first check the actual feed pitch set by the feed adjustment dial. It is necessary to measure the feed pitch and then assemble the potentiometer so that the feed pitch is displayed on the display, which is difficult to assemble, takes time, and requires adjustment when shipping the sewing machine. The problem is that work is delayed.

The present invention has been made to solve the above-mentioned problems, and its purpose is to provide a feed display device for a sewing machine that can accurately display the feed pitch and is easy to assemble.

(Means for Solving the Problems and Their Effects) In order to solve the above problems, the present invention provides a feed dog for imparting feed to the work cloth on the work cloth support surface and a sewing machine frame. A manual operation member that is screwed together so as to be rotatable, a feed adjustment member that is rotated based on the rotation operation of the operation member, and a feed adjustment member that is linked to the feed adjustment member via a connecting portion, A sewing machine equipped with a feed changer that is rotated in conjunction with the rotation of the adjustment member and that changes and sets the cloth feed amount of the feed dog, the sewing machine being rotatable in conjunction with the rotation of the feed adjustment member. An operating shaft is supported by the machine frame and projects outward from the machine frame, and the operating shaft is attached to the outer surface of the sewing machine frame and connected to the protrusion of the operating shaft via a transmission member, and the rotation amount of the operating shaft is a potentiometer that outputs a corresponding detection signal, a display device that can display the cloth feed amount, and a control means that causes the display device to display the cloth feed amount based on the detection signal from the potentiometer. There is.

Therefore, when installing the potentiometer on the outer surface of the sewing machine frame, the actual feed pitch (fabric feed amount)
If the correspondence between the detection signal output from the potentiometer and the detection signal output from the potentiometer is set in common for each sewing machine, the actual feed pitch displayed on the display device will match the actual feed pitch for all sewing machines. That will happen. Therefore, when changing the feed pitch to a desired value, it is sufficient to simply rotate the manual operation member while looking at the feed pitch displayed on the display device.

(Example) Hereinafter, an example embodying the present invention will be described in detail with reference to the drawings. As shown in FIGS. 1 and 4, a sewing machine main shaft 2 is rotatably supported within an arm portion 1a of a sewing machine frame 1, and a pulley 3 is attached to the right end thereof. Further, the arm portion 1
A needle bar 4 is supported in a vertically movable manner, and a needle 5 is attached to the lower end of the needle bar 4. And sewing machine frame 1
As the motor 6, which is disposed below the bed portion 1b, rotates, the pulley 7 on the motor shaft and the belt 8
The main shaft 2 of the sewing machine is rotated via the pulley 3, and the needle 5 is moved up and down through the work cloth W on the work cloth support surface of the bed portion 1b. A lock stitch is formed on the work cloth W by cooperation with a thread loop catcher (not shown).

Further, a needle position detector 9 for outputting a synchronization signal and detecting the needle up position and the needle down position is installed in the arm part 1a so as to face the pulley 3 on the sewing machine main shaft 2. There is. At the rear of the needle bar 4, a presser bar 11 having a presser foot 10 at its lower end is supported by the arm portion 1a so as to be movable up and down.

As shown in the fourth figure, a horizontal feed shaft 12 and a vertical feed shaft 13 are rotatably supported within the bed portion 1b. The horizontal feed shaft 12 has a feed base 1.
4 is rotatably supported via a support arm 15, and a feed dog 16 is attached to the upper surface of the feed dog 16, which can be retracted onto the work cloth support surface of the bed portion 1b. A bifurcated arm 17 attached to the vertical feed shaft 13 is engaged with an engaging portion 14a of the feed base 14.

A vertical feed eccentric cam (not shown) is mounted on the sewing machine main shaft 2, and as the vertical feed eccentric cam rotates, the feed dog 1 is moved through the crank rod 18, the vertical feed shaft 13, the two-pronged arm 17, etc.
6 is given a vertical feed motion. Further, an eccentric cam (not shown) for horizontal feeding is mounted on the main shaft 2 of the sewing machine, and a support shaft 19 is mounted on the horizontal feeding shaft 12 to change the cloth feeding direction and the amount of cloth feeding.
A feed switching device 20, which is rotated about
0, a horizontal feed motion synchronized with the vertical feed motion is applied to the feed dog 16 via the horizontal feed shaft 12 and the feed base 14. The feed dog 16 cooperates with the presser foot 10 to feed the work cloth W.

As shown in FIGS. 4 and 5, a feed adjustment member 25 is rotatably supported on a support shaft 26 at approximately the center within the arm portion 1a of the sewing machine frame 1, and the front side thereof has a side surface approximately shaped like a V-shape. A feed control cam 27 having a shape is formed. A connecting rod 28 is provided on the rear side of the feed adjustment member 25.
is rotatably attached at its upper end by a screw 29, and its lower end is rotatably connected to the feed switching device 20. Further, the feed adjustment member 25
is urged to rotate clockwise in FIG. 5 by a spring (not shown).

As shown in FIG. 5, an operating member 30 is rotatably screwed into the arm portion 1a at an intermediate threaded portion 31 in front of the feed adjusting member 25, and the feed adjusting member 25 is attached to the inner end of the operating member 30. feed control cam 27
An engaging portion 32 is provided for engaging with the feed adjustment member 25 to restrict and hold the feed adjustment member 25 at a predetermined position against the action of the spring, and an operation dial 33 is provided at the outer end. By rotating the operation dial 33 and moving the operation member 30 in the front-rear direction, the inclination angle of the feed adjustment member 25 is changed through the engagement between the engagement portion 32 and the feed control cam 27. Accordingly, by changing the rotation angle of the feed switching device 20, the amount of cloth feed by the feed dog 16 can be changed and set. Further, the feed switching device 20, the feed adjustment member 25, the operating member 30, etc. constitute a feed adjustment device.

As shown in FIG. 4, an operating shaft 34 extending from side to side is rotatably supported in the arm portion 1a above the feed switching device 20, and its right end protrudes outward to the right side of the arm 1a. An operating arm 35 is fixed to the left end of the operating shaft 34, and its rear end is rotatably connected to the intermediate portion of the connecting rod 28. When the cloth feed amount is changed and set by the feed adjustment member 25, the operating shaft 34 is rotated to a position corresponding to the cloth feed amount via the connecting rod 28 and the actuating arm 35.

A servo solenoid 38 is disposed within the arm portion 1a behind the operating shaft 34, and the front end of its armature 39 is operatively connected to the operating shaft 34 via a connecting body 40 and a pin 41. and,
When the armature 39 is moved forward by the operation of the servo solenoid 38 and the operating shaft 34 is rotated by a predetermined amount clockwise in FIG.
is rotated in the direction of decreasing the cloth feed amount, so that the cloth feed amount is reduced.

Further, as shown in FIG. 4, a potentiometer 42 as a feed detector for detecting the feed amount is mounted on the right outer surface of the arm portion 1a, corresponding to the right end protrusion of the operating shaft 34. , its rotation axis 4
A predetermined detection signal is output according to the amount of rotation. A transmission member 44 for transmitting the rotational movement of the operating shaft 34 to the rotating shaft 43 is disposed between the right end protrusion of the operating shaft 34 and the rotating shaft 43. In this embodiment, the potentiometer 4
2, the correspondence relationship between the actual feed pitch (cloth feed amount) and the detection signal output from the potentiometer 42 is determined.

As shown in FIGS. 1 and 3, a light projecting element 45 is attached to the arm portion 1a near the needle 5. An element support 46 is supported inside the bed portion 1b so as to be slidable in the cloth feeding direction so as to be positioned below the light projecting element 45. A light receiving element 48 facing the light projecting element 45 is mounted. Further, on the upper surface of the bed portion 1b, there is one through hole 47a into which the upper protrusion of the element support 46 can be fitted.
A throat plate 47 with a needle plate 47 is removably attached.
When the light-receiving element 48 is moved within the light irradiation range of the light-emitting element 45 due to the sliding of the element support 46, the needle plate 47 having a through hole 47a corresponding to the moved position is replaced. It is becoming more and more common.

Further, the element support 46 is connected to a linear potentiometer 49 on its lower surface, and a detection signal is output from the linear potentiometer 49 depending on the arrangement position of the element support 46. A cloth edge detection sensor is provided by both elements 45 and 46.
A WD is configured, and when the end of the work cloth W passes between the two elements 45 and 46 during sewing operation, a detection signal is output from the cloth end detection sensor WD.

Next, the electrical configuration of the sewing machine of this embodiment will be explained. As shown in FIG. 2, an operation panel 50 is provided on the front surface of the arm portion 1a, and on the panel 50 there are a memory key 51, a cloth thickness sensing key 52, a memorization key 53, a reproduction key 54, a pattern designation key 54, and a pattern designation key 53. A key 55, a stitch count key 56, a seam allowance key 57 which also serves as a thread trimming count key, a production quantity key 58, a clear key 59, addition keys 60a and 60b, and a subtraction key 61 are provided. Furthermore, a light emitting diode D for monitoring is provided above each key except for the addition and subtraction keys 60a, 60b, and 61, which lights up and decreases when the key is operated. Furthermore, on the operation panel 50, the seam allowance, the distance L between the right edge detection sensor WD and the needle drop position, the fabric feed amount (feed pitch),
A display section 62 for displaying the number of sheets produced and the like is provided.

Now, the central processing unit (CPU) 6 shown in Figure 6
A foot pedal 64 is connected to 3, and a drive stop signal output based on its operation causes the CPU to
63 drives and controls the motor 6 via a speed control circuit 65. The detection signal output from the cloth edge detection sensor WD is sent to the CPU 63 via the amplifier circuit 66.
is input. Moreover, the potentiometer 42
outputs a signal corresponding to the amount of rotation of the operating shaft 34 shown in FIG. 4, and the output signal is input to the CPU 63 via the A/D converter 82.

The linear potentiometer 49 outputs a signal corresponding to the amount of movement of the element support 49 shown in FIG.
It is input to the CPU 63.

The CPU 63 includes a thread trimming solenoid 67 for operating a thread trimming device (not shown) at the end of sewing, a fabric presser solenoid 68 for moving the presser foot 10 up and down, and decelerating the rotation of the sewing machine main shaft 2. An actuation signal is output to the brake device 2a etc. via the drive circuit 69. Further, the CPU 63 outputs an actuation signal to the servo solenoid 38 via the D/A converter 70a and the position control circuit 70.

A read-only memory (ROM) 71 and a random access memory (RAM) 72 are respectively connected to the CPU 63, and the ROM 71 stores programs for controlling the operation of the entire sewing machine, as well as data from the linear potentiometer 49 and the potentiometer 42. Distance data and cloth feed amount data between the light receiving element 48 of the cloth edge detection sensor WD and the needle drop position corresponding to the output signal are stored. On the other hand, RAM 72 has a working area 73.
Four memory areas 75 corresponding to the pattern numbers on the pattern designation key 55 are provided.

The working area 73 contains the cloth feed amount (feed pitch) detected by the potentiometer 42, the feed amount of the workpiece cloth W from the detection of the cloth end to the next needle drop position, and the feed stored in advance. The ratio to the pitch, that is, the phase, the distance L from the cloth edge detection position detected by the cloth edge detection sensor WD by the linear potentiometer 49 to the needle drop position
(See Figure 2) etc. are stored. Each of the memory areas 75 also includes the solenoids 38, 67, 6 corresponding to the sewing of each edge of the pocket cloth when sewing the pocket cloth to the work cloth W, for example.
Data representing operating conditions such as No. 8 and seam allowance data are stored.

The feed amount of the work cloth from the time the fabric edge is detected to the next needle drop position is determined based on the cloth feed amount data stored in the ROM 71, the synchronization signal output from the needle position detector 9, and the needle lower position detection signal. Calculated based on.

In the sewing machine of this embodiment, the memory mode is set by operating the memory key 51, and by performing memory sewing, for example, sewing a home base type pocket cloth piece to the work cloth W,
Seam allowance data corresponding to the sewing of each edge of the pocket cloth piece and data representing various operating conditions are stored in the RAM.
72 memory area 75.

Each memory area 75 and working area 73
When the regeneration key 54 is operated to perform regeneration sewing work based on the data, the regeneration mode is set. Either one when setting the playback mode.
When you select and operate the pattern designation keys 55,
The CPU 63 specifies the memory area 75 of the RAM 72 corresponding to that number. In this state, when the foot pedal 64 is depressed, the sewing machine is operated based on the data stored in the designated memory area 75. In other words, when a fabric edge is detected while the sewing machine is operating, the following data is used based on the feed phase, fabric feed amount, set seam allowance, and distance L between sensor needle drop positions at the time of fabric edge detection. The number of stitches from to the seam allowance is calculated, and based on the data, sewing is performed after detecting the cloth edge.

Next, the operation of this sewing machine will be explained with reference to FIG. When the memory key 51 and the playback key 54 are not operated and the normal mode is set, the pattern designation keys 55 of "1" to "4" are pressed.
When the pattern designation key 55 of “1” is operated,
The determination result of step S1 becomes YES, and the step
Proceed to S2. In this step S2, the distance L between the light receiving element 48 of the cloth edge detection sensor WD and the needle drop position is read out from the working area 73 of the RAM 72 based on the signal output from the linear potentiometer 49 shown in FIG. display section 62
will be displayed.

Further, if the determination result in step S1 is NO, the process advances to step S3, and when the pattern designation key 55 of "2" is operated, in the next step S4, the pattern designation key 55 is
Cloth feed amount data is read from the working area 73 of the RAM 72 and displayed on the display section 62.

If the determination result in step S3 is NO, the process advances to step S5, and when the production quantity key 58 shown in FIG. 3 is operated, the determination result becomes YES and the production quantity is displayed in the next step S6. .
Note that this production number was measured based on the number of times the thread trimming solenoid 67 was operated.

Also, if the determination result in step S5 is NO.
In this case, the process advances to step S7 and the display operation ends.

As described above, in this embodiment, the accurate cloth feed amount based on the output signal from the potentiometer 42 is displayed in conjunction with the key operation, so that, for example, sewing with a specified sewing length and number of stitches is performed. In this case, there is no need to perform the troublesome work of measuring the dimensions of the stitches actually sewn and rotating the operation dial 33 over and over again to adjust the amount of cloth feed.

Further, even if the arrangement position of the light receiving element 48 of the cloth edge detection sensor WD is changed within a predetermined range depending on the size of the feed dog 16 to be assembled, etc., in this embodiment, the Since the distance L between the sensor needle drop positions is accurately set based on the output signal, there is no fear that the actually formed seam allowance will change due to a change in the distance L when sewing based on the set seam allowance. , can perform accurate sewing.

Note that this invention is not limited to the above-described embodiment; for example, the number of stitches from passing through the fabric edge detection sensor to the fabric edge or the synchronization signal (output from the needle position detector) may be set during memorized sewing. It is also possible to embody the present invention in a type of sewing machine that performs regenerated sewing based on the setting data.

(Effects of the invention) As described in detail above, in the present invention, the feed adjustment member is rotated by the rotation of the manual operation member, and the operating shaft that is rotated in conjunction with the feed adjustment member is moved outside the sewing machine frame. A potentiometer is connected to the protrusion via a transmission member, and the potentiometer is attached to the outer surface of the sewing machine frame, and the amount of cloth feed is displayed on a display device based on a detection signal from the potentiometer. It is configured as follows. Therefore, by rotating the manual operation member, the actual feed amount that has been changed can be known. For example, when sewing a specified sewing length and number of stitches, it is possible to know the actual feed amount that has been changed. There is no need to perform the troublesome work of measuring seam dimensions and rotating the manual operation member over and over again to adjust the amount of fabric feed, and the desired sewing can be performed accurately in a short time. be able to. Furthermore, it is possible to assemble and adjust the potentiometer easily and in a short time.

[Brief explanation of the drawing]

Figure 1 is a front view of a sewing machine embodying this idea, Figure 2 is a partially enlarged front view of the operation panel, and Figure 3 is a front view of a sewing machine embodying this idea.
Figure 4 is a partially enlarged side sectional view of the sewing machine, Figure 4 is a perspective view showing the feed mechanism, Figure 5 is also a partial side sectional view,
FIG. 6 is an electrical block circuit diagram, and FIG. 7 is a flowchart. In the figure, 16 is a feed dog, 20 is a feed switch, 25 is a feed adjustment member, 30 is an operation member (the above-mentioned 20, 25, 30, etc. constitute a feed adjustment device), and 42 is a feed detector. A potentiometer, 62 a display section, and 63 a CPU serving as a control means.

Claims (1)

[Claims for Utility Model Registration] A feed dog 16 for imparting feed to the work cloth W on the work cloth support surface, a manual operation member 30 rotatably screwed to the sewing machine frame 1, and the same. A feed adjustment member 25 that rotates based on the rotation operation of the operating member 30; and a feed adjustment member 25 that is linked to the feed adjustment member 25 via a connecting portion and rotates in conjunction with the rotation of the feed adjustment member 25. and a feed changer 20 for changing and setting the cloth feed amount of the feed dog 16, the sewing machine being rotatably supported by the sewing machine frame 1 in conjunction with rotation of the feed adjustment member 25; An operating shaft 34 whose one end protrudes outward from the machine frame is attached to the outer surface of the sewing machine frame 1 and connected to a protrusion of the operating shaft 34 via a transmission member 44, and the rotation of the operating shaft 34 is connected to the outer surface of the sewing machine frame 1. a potentiometer 42 that outputs a detection signal according to the amount of movement; a display device 62 that can display the amount of cloth feed; and a display device 62 that displays the amount of cloth feed based on the detection signal from the potentiometer 42. A feed display device for a sewing machine, comprising: a control means 63;