JP2003326029A - Fabric feeding apparatus of sewing machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a fabric feeding apparatus of a sewing machine, which can realize stable sewing operations by preventing the step-out of a stepping motor for changing a feed pitch. <P>SOLUTION: This fabric feeding apparatus of the sewing machine comprises a feed dog 11 for feeding a fabric by coming out onto/receding from a throat plate in mechanical synchronization with a main spindle driven by a main spindle motor 4, a square piece 30 for changing the feed pitch by changing an angle of gradient with respect to a prescribed reference position, and the stepping motor 50 for changing the angle of the gradient of the square piece 30. The fabric feeding apparatus is equipped with: an operating member 13 for outputting a command signal for changing the feed pitch; a means for detecting the rotational speed of the motor 4; a means for determining the rotational speed of the motor 4 when the operating member 13 is operated; and a central processing unit (CPU) 80 which changes the feed pitch by making the operation of the operating member 13 effective and driving the stepping motor 55 when the rotational speed of the motor 4 is lower than/as high as a prescribed upper limit speed, and which nullifies the operation of the operating member 13 when the rotational speed of the motor 4 is higher than the prescribed upper limit speed. <P>COPYRIGHT: (C)2004,JPO

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cloth feeding device for a sewing machine.
Position, especially for changing the feed pitch of the feed dog
Prevents motor step-out and realizes stable sewing work
The present invention relates to a cloth feeding device for a sewing machine. [0002] In recent years, when performing a predetermined sewing operation,
Various cloth feeders have been proposed for feeding a cloth in a predetermined direction.
Has been put to practical use. Conventional cloth feeders include needles
A feed dog that appears on the board and feeds the fabric, and the movement of this feed dog
And a square piece that performs the function of changing the trajectory
Proposed. In such a cloth feeding device, a predetermined
By changing the angle of the square piece relative to the reference position,
To change the feed dog movement trajectory and thereby change the feed pitch.
I am trying to change it. [0003] As an example of a means for changing the inclination angle of a square piece,
As shown in FIG. 9, as shown in FIG.
The operation lever 210 and the operation lever 210 are arranged in the sewing machine bed 300.
The square piece 310 and the predetermined link mechanism 400
This operation lever 2
By operating the dial 10, a well-known feed adjustment dial can be used.
The inclination of the square piece 310 preset by 220
Means for changing the oblique angle have been proposed. The angle of inclination of the square piece is determined by a pulse motor.
It can be changed by the driving force of the
By the operator at the time of performing
Drive the pulse motor based on the operating means to set the square piece.
Change the feed pitch by setting a fixed tilt angle
Means have also been proposed. [0005] However, the square piece
Is connected to the lower shaft of the sewing machine via a coupling mechanism,
Change the tilt angle of the square piece with a pulse motor to adjust the feed pitch.
When changing, the pulse motor must be
A load corresponding to the rotation speed of the sewing machine is applied. Usually,
When the perpetrator performs stop sewing, the sewing machine pedal
This is not a problem because it is performed after lowering the sewing machine speed.
But the operator accidentally
When the operation means is operated, the pulse motor
After that, when sewing at the desired feed pitch becomes impossible,
There was a problem. As a countermeasure, when the operating means is operated,
Before changing the inclination angle of the square piece by the pulse motor
The load on the square pieces by lowering the sewing machine speed.
Then change the angle of the square piece to step out of the pulse motor.
It is also considered to prevent it. But in that case, mistake
Every time the operating means is operated, the sewing machine
At the same time, unnecessary stitches on the sewing
Will cause a new problem of
You. An object of the present invention is to provide a feed pitch changing pulse.
Prevents motor step-out and realizes stable sewing work
To provide a sewing machine cloth feeder capable of
You. Means for Solving the Problems [0008] To solve the above problems,
Therefore, the invention according to claim 1 is, for example, shown in FIGS.
So that the main shaft driven by the main shaft motor (4)
Feeding the fabric that appears and disappears on the needle plate (12) in conjunction with the
Change the tooth (11) and the inclination angle with respect to a predetermined reference position
To change the movement trajectory of the feed dog to
A square piece (30) for changing the switch, and the inclination angle of the square piece
A pulse motor (50) for changing the degree
In the cloth feeding device, the feed pitch is changed.
Operating means (operating lever 6 and operating
Operation switch 7) and detects the rotation speed of the spindle motor.
Speed detecting means (4a) and the operating means are operated
When the rotation speed of the spindle motor is lower than a predetermined upper limit speed
Determining means (CPU 80 and determining means
Program 110) and the rotation speed of the spindle motor is
If it is determined that the speed is lower than the predetermined upper limit speed,
The command signal by the operation of the
The feed pitch is changed by driving the
It is determined that the rotation speed of the shaft motor is higher than the predetermined upper limit speed.
In the case of separation, the command signal by the operation of the operation means is turned off.
Control means (CPU 80) to be effective.
To sign. According to the first aspect of the present invention, the inclination of the square piece
Pulse motor is used as a drive source to change the angle
And outputs a command signal to change the feed pitch
Operating means and the speed at which the rotational speed of the spindle motor is detected
Detecting means and rotation of the spindle motor when the operating means is operated;
A judgment to determine whether the rotation speed is equal to or less than a predetermined upper limit speed.
Separate means, the rotation speed of the spindle motor is below a predetermined upper limit speed
If the command signal is determined to be
Change the feed pitch by driving the pulse motor with
On the other hand, the rotation speed of the spindle motor
Command signal by operating the operating means
Control means for invalidating the signal, the spindle motor
If the rotation speed of the
Even if it operates, the command signal by the operation of such operation means,
It can be easily invalidated by the control means. Therefore, the operator mistakenly operates the sewing machine at a high speed.
Pulse motor when operating means is operated during rotation
Stitching can be prevented beforehand and stable sewing
Business can be realized. And like before,
The sewing machine slows down every time the operating means is operated by mistake
It is not necessary for the sewing
The formation of a seam can be prevented beforehand. BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a block diagram showing an embodiment of the present invention;
The embodiment will be described in detail. FIG. 1 shows a cloth feeder according to this embodiment.
FIG. 2 is a schematic diagram for explaining the overall configuration of the sewing machine provided.
You. FIG. 2 is a sectional view taken along the line II-II of FIG.
Of the fabric feeder provided in the bed 1
This is for clarification. FIG. 3 is a III-III part of FIG.
FIG. 4 is a cross-sectional view of the feed transmission mechanism that constitutes the cloth feed device.
FIG. 4 is a view for explaining the configuration, and FIG.
To explain the configuration near the pulse motor that constitutes the
FIG. FIG. 5 shows operating means constituting the cloth feeding device.
Explanatory drawing for explaining a configuration near a certain operation lever 6
It is. As shown in FIG. 1, the microphone according to this embodiment is
The shin is placed on a sewing machine stand Z and a needle plate 12 is provided on the upper surface.
Bed 1 (shown by broken lines)
Arm 2 extending substantially parallel to bed 1 above
And extend downward from the front end of the arm 2 to move up and down
Needle bar 3, upper shaft and crank mechanism not shown
Spindle motor that moves the needle bar 3 up and down through
4) and a cloth feed for sending the cloth placed on the bed 1
Device and control device 5 for integrated control of all operations of the sewing machine
And an operation lever which is an operation means for operating the cloth feeding device.
Bar 6 and operation switch 7 (hereinafter, operation lever 6 and
And the operation switch 7 are collectively referred to as an “operation member 13”.
: See FIG. 6), and
An operation pedal 8 for adjusting the rotation speed, sewing data and
An operation panel 9 for displaying the rotation speed of the motor 4;
Speed detecting means 4a for detecting the rotation speed of the sewing machine motor 4
(See FIG. 6). This sewing machine uses needle bar 3
Do not move the needle attached to the tip of the
By sending the fabric in a predetermined direction with a cloth feeder,
The seams are applied to the fabric. In addition, the control device 5
Also serves as a controller for the cloth feeder. First, the present embodiment will be described with reference to FIGS.
The configuration of the cloth feeding device according to the embodiment will be described. Cloth feed
The device moves the lower shaft 10, the rotational movement of the lower shaft 10 to the feed dog 11.
Feeding transmission mechanism 20 for transmitting, feed pitch of feed dog 11
(Amount of cloth feed by feed dog 11 per rotation of lower shaft 10)
Piece 30 to be changed, feed adjusting shaft 4 into which square piece 30 is fitted
0, equipped with a pulse motor 50 for changing the inclination angle of the square piece, etc.
I have. FIG. 2 shows the interior of the bed 1 in FIG.
It is the figure seen from the paper surface lower side. Bed as shown in FIG.
Inside the part 1 is rotatable around the axis extending in the front-back direction
The lower shaft 10 is attached. The lower shaft 10 is
The sewing machine motor 4 is connected via a link mechanism (not shown).
It is connected to the drive take-out shaft. For this reason, the sewing machine motor
4 is driven, the lower shaft 10 also rotates via the link mechanism.
It is configured to be. At the front end of the lower shaft 10, (not shown)
I) It is arranged below the presser foot and
And a feed dog 11 for feeding the cloth.
Is attached. Behind the lower shaft 10, the rotation of the lower shaft 10
Feeding that transmits the rolling motion to the feed dog 11 to drive the feed dog 11
The transmission mechanism 20 is attached. FIG. 3 is a sectional view taken along the line III-III of FIG.
Shows a state where the upper side of the bed unit 1 is arranged on the upper side of the drawing.
ing. The feed transmission mechanism 20 includes a horizontal feed cam 21, a horizontal
Feed rod 22, horizontal feed connecting rod 23, horizontal feed arm 2
4, horizontal feed shaft 25, feed bar arm 26, feed bar 27, up and down
A feed link 28 and the like are provided. The horizontal feed cam 21 is biased with respect to the lower shaft 10.
Centered eccentric cam.
Upper end of the horizontal feed rod 22 rotatably via a ring
It is connected to. The lower end of the horizontal feed rod 22
It is rotatably connected to the left and right middle part of the horizontal feed connecting rod 23.
You. The right end of the horizontal feed connecting rod 23 is
The lower arm 24 is rotatably connected to the lower end. Horizontal
The upper end of the feed arm 24 is fixed to the rear end of the horizontal feed shaft 25.
Is defined. The horizontal feed shaft 25 has its center in the front-rear direction
It is attached to the bed part 1 so that it can rotate freely
The front end of the horizontal feed shaft 25 is
It is fixed to the lower end. Upper end of feed bar arm 26
Is rotatably connected to the right end of the feed base 27.
You. The feed dog 11 is fixed on the feed base 27.
I have. The left end of the feed bar 27 is
It is rotatably connected to the upper end. Vertical feed link
28 is connected rotatably to the front end of the lower shaft 10
Have been. On the other hand, on the left end of the horizontal feed connecting rod 23,
Square pieces 30 are connected. The square piece 30 is inclined with respect to a predetermined reference position.
By changing the angle (rotation angle) of the feed dog 11
Functions to change the trajectory and change the feed pitch.
Things. The square piece 30 is located between the front and rear of the feed adjustment shaft 40.
Is fitted into a groove 40a formed in the
It is possible to rotate at a fixed angle from the reference position, and
Constructed so as not to fall out of groove 40a by feed adjustment lid
Have been. The angle of inclination of the square piece 30 is determined by a pulse mode described later.
Data 50. FIG. 4 is a perspective view of the bed 1 shown in FIG.
Of the vicinity of the pulse motor 50 viewed from the direction of arrow IV
FIG. 4 is a partial perspective view of the case, where the upper side of the bed 1 is the upper side
Is shown. The feed adjustment shaft 40 is
Attached to the bed part 1 so that it can rotate about the axis of the direction
Have been killed. At the rear end of the feed adjustment shaft 40, the first feed
The upper end of the adjusting link 41 is fixed. First send
The lower end of the feed adjustment link 41 is
2 is rotatably connected to the left end. Second feed tone
The right end of the node link 42 is
It is rotatably connected to the upper end. 3rd feed adjustment
The lower end of the link 43 is a drive take-out shaft of the pulse motor 50.
It is fixed to 51. FIG. 5 shows the arm portion 2 of FIG.
5 (a) is a partial perspective view when viewed from above, and FIG.
FIG. 5B shows a state before the operation lever 6 of the apparatus is operated.
Pushes down the operating lever 6 from the state of FIG.
Each state is shown. The operating lever 6 has a shaft member 6a
It is rotatably attached. The shaft member 6a has
The first connecting member 6b that rotates together with the operation lever 6 can rotate.
The first connecting member 6b is biased.
Urged downward by the coil spring 60
Have been. For this reason, the operation lever 6 rotates upward.
Urged upward by the upper contact portion 6c.
Is prevented from rotating. In addition, the operation is
Limiting the operation amount (downward depression amount) of the operation lever 6
Contact portion 6d is provided. The operating lever 6 and the first
The second connecting member 6e that rotates together with the connecting member 6b rotates
Mounted on the second connecting member 6e.
The upper end of the third connecting member 6f is rotatable at the one end.
Are linked. The lower end of the third connecting member 6f is
Encoder 70 for detecting the rotation angle of
You. When the operating lever 6 is pushed down,
The third connecting members 6e and 6f are sequentially turned counterclockwise in FIG.
Is turned, the turning angle of the third connecting member 6e becomes
Detector 70. As a result, the operation lever 6
Is indirectly detected by the encoder 70
It will be. The operation level detected by the encoder 70
The operation amount of the bar 6 is controlled by being converted into an electric command signal.
Transmitted to the means 5. It will be described later provided in the control means 5.
The CPU 80 receives a command signal from the encoder 70
Then, the pulse motor 50 is driven. Normally, the operation switch 7 is
Switch or touch-back switch, a well-known switch.
When operated, it is sent in the same way as the operation lever 6.
A command signal for changing the pitch is output.
When the operation switch 7 is operated, the operation lever 6 is different from the operation lever 6.
Pulse mode so that the feed pitch always becomes a predetermined constant value.
The motor 50 is driven. Next, the mechanical operation of the cloth feeder will be described.
explain. Press the pedal 7 of the sewing machine to
When the lower shaft 10 is rotated by driving the
The rotation of the lower shaft 10 is controlled by a horizontal feed cam 21 and a horizontal feed roller.
, The horizontal feed connecting rod 23 and the horizontal feed arm 24
Is transmitted to the horizontal feed shaft 25 via the
Perform a backward rotation motion. And the reciprocating rotation of the horizontal feed shaft 25
The movement is performed by the feed dog 1 via the feed bar arm 26 and the feed bar 27.
1 to reciprocate the feed dog 11 in the left and right direction
Will be done. On the other hand, the rotational movement of the lower shaft 10 is
Is transmitted to the feed stand 27 through the
Vertical reciprocation of the feed dog 11 fixed on the feed base 27
Exercise will be realized. As a result, the feed dog 11 reciprocates in the left-right direction.
Circle or ellipse by combining motion and reciprocating motion in vertical direction
By performing exercise, it is pressed from above by the cloth foot
A cloth feeding motion for feeding the cloth in a predetermined direction is performed. Here, the feed dog 11 projects upward from the needle plate.
Circle or ellipse to move from left to right while out
When you exercise, the cloth held by the work clamp
You. On the other hand, the feed dog 11 projects upward from the needle plate
Perform a circular or elliptical motion, moving from right to left in between
Then, the cloth held by the cloth foot is fed backward. The conversion between the forward feed and the reverse feed of the feed dog 11 is as follows.
The rotation phase of the horizontal feed shaft 25 with respect to the rotation phase of the shaft 10 is
It is performed by changing the rotation phase of the lower shaft 10 and the horizontal
The rotation phase of the feed shaft 25 can be changed by changing the angle of the
(Rotation angle with respect to a fixed reference position)
Will be revealed. That is, the square piece 30 is positioned at the initial position shown in FIG.
When the feed dog 11 rotates in the direction A from
Move and the square piece 30 moves from the initial position shown in FIG.
When it rotates in the direction, the feed dog 11 performs the reverse feed motion.
U. Also, even when the feed dog 11 feeds forward,
Even when feeding, the movement trajectory of the feed dog 11 is as described above.
The shape is circular or elliptical, but the diameter in the left-right direction changes.
By being changed, the feed pitch (lower shaft 10 per rotation)
The cloth feed amount by the feed dog 11) is changed. That is,
Feeding with the horizontal feed shaft 25 per fulcrum per rotation of the lower shaft 10
By changing the range of the rotation angle of the
Of the motion trajectory of the base 27 and the feed dog 11
The diameter is changed, thereby changing the feed pitch.
Specifically, as the turning angle of the square piece 30 increases,
Forward / reverse cloth feed amount (feed pitch) per one rotation of lower shaft 10
growing. As described above, the inclination angle of the square piece 30 (the predetermined angle)
Change from the reference position),
It is possible to change the feed direction and feed pitch of the feed dog 11
it can. The change of the inclination angle of the square piece 30 is performed by the pulse motor 5.
Performed by 0. That is, to operate the operating member 13
Therefore, the pulse motor 50 shown in FIG.
When the take-out shaft 51 is rotated clockwise in FIG.
3, the second and first feed adjusting links 43, 42 and 4
The feed adjustment shaft 40 is rotated in the direction A via the rotations 1 sequentially.
On the other hand, when the drive take-out shaft 51 rotates counterclockwise,
3, the second and first feed adjusting links 43, 42 and 4
The feed adjustment shaft 40 rotates in the B direction via the rotations 1 sequentially.
As described above, the pulse motor 50 is driven by the third, second and first motors.
Feed adjustment via feed adjustment links 43, 42 and 41
By rotating the shaft 40, the inclination angle of the square piece 30 is changed.
Be changed. Next, the cloth feeder according to the present embodiment
The electrical configuration will be described with reference to FIGS.
You. FIG. 6 shows a mill provided with a cloth feeder according to the present embodiment.
FIG. 3 is a block diagram for explaining an electrical configuration of the thin device.
FIG. 7 shows a ROM 100 provided in the control device of FIG.
FIG. 4 is an explanatory diagram for describing a program stored in
You. The control unit 5 has a CPU (Central Process
ng Unit) 80, RAM (Random Access Memory) 9
0, ROM (Read Only Memory) 100, etc.
Based on various control programs stored in the ROM 100.
The function of integrated control of the entire operation of the sewing machine
Add The control device 5 has an input interface (not shown).
Operation lever 6, operation switch 7, operation
It is electrically connected to the pedal 8, the operation panel 9, etc.
You. The operation amount of the operation lever 6 is controlled by the encoder 70.
After being detected and converted into an electrical command signal, the CPU 8
0 is transmitted. Also, the operation amount of the operation pedal 7 is shown in the figure.
To an electrical command signal by an unencoded encoder
After that, it is transmitted to the CPU 80. A command signal relating to the operation amount of the operation pedal 7 is received.
The CPU 80 mainly operates via a drive circuit (not shown).
Drive the shaft motor 4 and rotate the upper shaft to move the needle bar 3 up and down.
To perform a predetermined sewing operation. At this time, speed detection means
4a relates to the rotation speed of the spindle motor 4 detected by the
The signal is transmitted to the CPU 80. Further, a command signal relating to the operation member 13 is received.
CPU 80 receives a pulse through a drive circuit (not shown).
Drive the motor 50 to adjust the third, second and first feeds.
Tilt of the square piece 30 via the links 43, 43 and 41 in order.
Change the tilt angle. By this operation, the feeding of the feed dog 11 is performed.
The pitch can be changed. The CPU 80 detects the speed during the sewing operation.
Of the spindle motor 4 detected and transmitted by the output means 4a.
Set the rotation speed, sewing pattern, sewing conditions, etc.
It is displayed on the operation panel 9. As shown in FIG.
The rotation speed of the spindle motor 4 when the working member 13 is operated is
Judgment for judging whether the speed is below a predetermined upper limit speed
The program 110 is recorded. This discrimination program
CPU 110 reads and activates program 110
Thus, the rotation of the spindle motor 4 when the operating member 13 is operated
It is determined whether the rotation speed is equal to or less than a predetermined upper limit speed.
Can be. That is, the discrimination program in the ROM 100
The system 110 and the CPU 80 are determining means. The CPU 80 has a discriminating program in the ROM 100.
As a result of executing Gram 110, the rotational speed of the spindle motor 4
If it is determined that the degree is equal to or less than the predetermined upper limit speed,
The pulse motor 50 is driven with the operation of the operation member 13 enabled.
It performs the function of changing the feed pitch by moving. one
On the other hand, the CPU 80 executes the determination program 1 in the ROM 100.
10, the rotation speed of the spindle motor 4 is
If it is determined that the speed is higher than the upper limit speed of
The function of invalidating the operation 3 is also performed. Sand
That is, the CPU 80 is control means in the present invention. As shown in FIG.
To the feed pitch changed by the operation of the operation member 13.
Accordingly, the predetermined upper limit speed referred to by the determination program 110
The maximum speed switching program 120 for switching degrees is recorded.
Have been. This upper limit speed switching program 120 is executed by the CPU.
80 to read and cooperate with the discrimination program 110
With the upper limit speed according to the feed pitch,
The determined discrimination operation can be performed. That is, ROM1
Upper limit speed switching program 120 in CPU 00 and CPU 8
0 is an upper limit speed switching means. Subsequently, the control operation of the cloth feeder according to the present invention will be described.
The operation will be described with reference to a flowchart. In the present embodiment, the determination means
When the upper limit speed is constant (2000 rpm)
The control operation is described with reference to the flowchart of FIG.
I will tell. First, turn on the power switch of the sewing machine, and
Depress step 8 to drive spindle motor 4, and
The needle bar 3 is moved up and down via the rank mechanism to perform a predetermined sewing operation.
Do the work. During this sewing operation, the CPU 80
The operation amount of the operation lever 6 detected by the
Read the operation state of the operation switch 7 (operation amount reading
Step: S1). When the operation amount of the operation member 13 is detected,
Is detected by the CPU 80 by the speed detecting means 4a.
The rotation speed of the spindle motor 4 (sewing machine speed reading
Step: S2). On the other hand, the operation amount of the operation member 13 is detected.
If not, proceed to sewing speed reading step S2.
And the control operation ends. In the sewing machine speed reading step S2, the spindle motor
After reading the rotation speed of the motor 4, the CPU 80
The discrimination program 110 recorded in M100 is started.
And the read rotation speed is lower than the predetermined upper limit speed.
It is determined whether or not it is (speed determination step: S3). Form of this implementation
In the embodiment, as described above, the predetermined upper limit speed is set at 20.
It is set to 00 rpm. In the speed discriminating step S3, the spindle motor 4
When the rotation speed of the motor is less than the predetermined upper limit speed (2000 rpm)
If it is determined that there is, the CPU 80
Operation 3 is enabled and the pulse motor 50 is driven to feed.
The pitch is changed (feed pitch changing step: S4). one
On the other hand, in the speed determining step S3, the rotational speed of the spindle motor 4
Judgment that the degree is higher than the predetermined upper limit speed (2000 rpm)
In this case, the CPU 80 controls the operation of the operation member 13.
Invalid, control operation without driving pulse motor 50
End the work. The cloth feeder for a sewing machine according to the present embodiment
In order to change the angle of the square piece, the pulse
Uses a motor 50 to change the feed pitch
An operating member 13 which is an operating means for outputting a command signal of
Speed detection means 4a for detecting the rotation speed of the spindle motor 4
And rotation of the spindle motor 4 when the operating member 13 is operated
Judgment for judging whether the speed is lower than a predetermined upper limit speed
A CPU 80 and a determination program 110 as means,
When the rotation speed of the spindle motor 4 reaches a predetermined upper limit speed (2000r
pm) or less, the operation of the operation member 13 is determined.
Drive the pulse motor 50 by validating the command signal
To change the feed pitch while the rotational speed of the spindle motor 4
Judgment that the degree is higher than the predetermined upper limit speed (2000 rpm)
Command signal by operating the operating member 13 is invalidated
And a CPU 80 which is a control means for
When the rotation speed of the shaft motor 4 reaches a predetermined upper limit speed (2000 rpm
m), even if the operating member 13 is operated at a higher
A command signal output by operating the operation member 13 is referred to as CP
It can be easily invalidated by U80. Therefore, the operator mistakenly operates the sewing machine at high speed.
Pulse mode when operating the operating member 13 during rotation
Step-out of the motor 50 can be prevented beforehand, and stable
A simple sewing operation can be realized. Moreover, conventional
Every time the operating member 13 is operated by mistake,
Is not dropped at low speed, unnecessary for sewing
Preventing the formation of non-locking stitches
Can be. The present invention is limited to the above embodiment.
It goes without saying that it can be changed as appropriate. According to the first aspect of the present invention, the inclination of the square piece is
A pulse motor is used as a drive source to change the tilt angle.
Command signal to change the feed pitch.
Operating means to apply force and speed for detecting the rotation speed of the spindle motor
Degree detection means and the spindle motor when the operation means is operated.
Determine whether the rotation speed is lower than or equal to a predetermined upper limit speed
Determining means that the rotation speed of the spindle motor is equal to or less than a predetermined upper limit speed;
Command by operating the operating means when it is determined to be below
The pulse pitch is driven by driving the pulse motor with the signal effective.
While changing the speed, the rotation speed of the spindle motor
If it is determined that it is higher, a command by operating the operation means
Control means for invalidating the signal.
Operation means when the rotation speed of the motor is higher than a predetermined upper limit speed.
Command signal by operating the operating means
Can be easily invalidated by the control means. Therefore, the operator mistakenly operates the sewing machine at a high speed.
Pulse motor when operating means is operated during rotation
Stitching can be prevented beforehand and stable sewing
Business can be realized. And like before,
The sewing machine slows down every time the operating means is operated by mistake
It is not necessary for the sewing
The formation of a seam can be prevented beforehand.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a schematic diagram for explaining an overall configuration of a sewing machine provided with a cloth feeding device according to the present embodiment. FIG. 2 is a sectional view taken along the line II-II in FIG. FIG. 3 is a sectional view taken along the line III-III of FIG. 2; FIG. 4 is an explanatory diagram for describing a configuration near a pulse motor of the cloth feeding device according to the present embodiment. FIG. 5 is an explanatory diagram for describing a configuration near an operation lever of the cloth feeding device according to the present embodiment. FIG. 6 is a block diagram for explaining an electrical configuration of a sewing machine including the cloth feeding device according to the embodiment. FIG. 7 is an explanatory diagram for describing a program recorded in a ROM provided in the control device of FIG. 6; FIG. 8 is a flowchart illustrating a control operation of a sewing machine including the cloth feeding device according to the embodiment. FIG. 9 is an explanatory diagram for explaining a link mechanism for connecting an operation lever and a square piece of a conventional cloth feeder. [Description of Signs] 1 Bed part 2 Arm part 3 Needle bar 4 Spindle motor 4a Speed detecting means 5 Control device 6 Operating lever 6a Shaft member 6a 6b First connecting member 6c Upper restricting part 6d Lower restricting part 6e Second connecting member 6f Third connection member 7 Operation switch 8 Operation pedal 9 Operation panel 10 Lower shaft 11 Feed dog 12 Needle plate 13 Operation member 20 Feed connection mechanism 21 Horizontal feed cam 22 Horizontal feed rod 23 Horizontal feed connection rod 24 Horizontal feed arm 25 Horizontal feed axis 26 feed base arm 27 feed base 28 vertical feed link 30 square piece 40 feed adjustment shaft 40a groove 41 first feed adjustment link 42 second feed adjustment link 43 third feed adjustment link 50 pulse motor 51 drive take-out shaft 60 coil spring 70 encoder 80 CPU 90 RAM 100 ROM 110 Determination program 120 Upper limit speed switching program 2 00 Sewing machine head 210 Operation lever 220 Feed adjustment dial 300 Sewing bed 310 Square piece 400 Link mechanism S1 Operation amount reading step S2 Sewing machine speed reading step S3 Speed discriminating step S4 Feed pitch changing step

   ────────────────────────────────────────────────── ─── Continuation of front page    (72) Inventor Mobu             1-cho, 8-2 Kokuryo-cho, Chofu-shi, Tokyo             KYU Corporation (72) Inventor Yoshihiko Kubota             1-cho, 8-2 Kokuryo-cho, Chofu-shi, Tokyo             KYU Corporation F term (reference) 3B150 CE07 CE22 DE06 DE13 DE17                       DE27 DE31 DE32 DE33 GD14                       GD25 GE05 JA03 JA07 JA19                       JA28 LA15 LA85 LB01 LB02                       NA14 NB03 NC03 NC06 PA03                       QA06 QA07

Claims (1)

Claims: 1. A feed dog which feeds a fabric by moving up and down on a needle plate in mechanical linkage with a spindle driven by a spindle motor, and changing an inclination angle with respect to a predetermined reference position. And a pulse motor that changes the feed pitch by changing the movement trajectory of the feed dog, and a pulse motor that changes the inclination angle of the square piece, wherein the feed pitch is changed. Operating means for outputting a command signal; speed detecting means for detecting a rotational speed of the spindle motor; and determining whether or not the rotational speed of the spindle motor when the operating means is operated is equal to or lower than a predetermined upper limit speed. Discriminating means for discriminating, when the rotational speed of the spindle motor is determined to be equal to or less than the predetermined upper limit speed, a command signal by operation of the operating means is activated to drive the pulse motor. Control means for invalidating a command signal by operating the operation means when it is determined that the rotation speed of the spindle motor is higher than the predetermined upper limit speed while changing the feed pitch. Sewing machine cloth feeder.