JP3002568B2 - Embroidery machine for teaching - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an embroidery machine for teaching which is suitably used for preparing teaching data of an embroidery pattern prior to repeatedly reproducing the embroidery pattern by a zigzag sewing machine with rotation.

[0002]

2. Description of the Related Art In general, a base on which a lower thread for embroidery is disposed, and an embroidery needle on the upper thread side is reciprocated up and down at a position opposed to the lower thread side provided on the base. A head of an embroidery machine that swings with a required swing width, and is provided under the head so as to be movable on the base, and is driven in a X-axis direction and a Y-direction on the base by a driving source. A moving frame driven in the axial direction, and a rotating frame which holds the embroidery cloth in an extended state in the moving frame and is rotated together with the embroidery cloth in the moving frame by a rotation source provided in the moving frame. A rotating zigzag sewing machine having a structure is known, for example, from Japanese Patent Application Laid-Open No. 63-203188.

In this type of zigzag sewing machine with rotation, when the embroidery needle is reciprocated up and down while swinging the embroidery needle at a required swing width by the head of the embroidery machine, the moving frame is driven in the X-axis and Y-axis directions. In addition, since the embroidery cloth is rotated together with the rotating frame in the moving frame, a zigzag pattern corresponding to the swing width of the embroidery needle can be rotated to realize an embroidery pattern on the embroidery cloth. There is an advantage that an embroidery pattern can be created in a relatively short time.

In this kind of zigzag sewing machine with rotation, there are position detecting means for detecting the amount of movement of the moving frame in the X-axis and Y-axis directions, and rotation angle detecting means for detecting the rotation angle of the rotating frame with respect to the moving frame. And a swing width detecting means for detecting the swing width of the embroidery needle, and a teaching operation, which is usually called an "exemplary learning" method, is performed prior to repeatedly reproducing the embroidery pattern.

That is, during the teaching operation, a skilled operator prepares a desired embroidery pattern by adjusting the swing width of the reciprocating embroidery needle while manually moving and rotating the moving frame and the rotating frame. When reading, the signal is read from each of the detection means and the position of the moving frame,
The rotation angle of the rotating frame, the swing width of the embroidery needle, and the like are stored, and based on the stored data, the drive source and the rotation source are operated to repeatedly reproduce an embroidery pattern similar to that of an expert. .

[0006]

By the way, in the above-mentioned prior art, a skilled operator performs a teaching operation by using a rotating zigzag sewing machine provided with a driving source and a motor serving as a rotation source. Therefore, for example, when the operator manually moves and rotates the moving frame or the rotating frame, the load of the motor serving as the driving source or the rotating source is large, so that the teaching work cannot be performed smoothly, and the embroidery pattern at the time of teaching is not possible. Cannot be created with high quality.

In particular, when a complicated embroidery pattern is created by teaching work, the burden on the operator increases and the quality of the embroidery pattern tends to deteriorate, and thereafter the quality of the embroidery pattern repeatedly reproduced by the zigzag sewing machine with rotation also deteriorates. Problem.

Further, the present applicant has previously filed Japanese Patent Application No. 1-261.
No. 711 proposed an embroidery machine data generating apparatus in which a tablet is used to read the outline of an original embroidery drawing. If you use this tablet, the outline of the original
It can be detected with high accuracy as position data in the axis and Y axis directions.

However, when this tablet is applied to the conventional zigzag sewing machine with rotation, relatively large vibration is generated from the driving source of the moving frame or the rotation source of the rotating frame, and this vibration is transmitted to the tablet. The cursor slightly vibrates on the tablet, which makes it difficult to detect the position of the moving frame by the tablet.

The present invention has been made in view of the above-mentioned problems of the prior art, and the present invention can eliminate the load caused by the driving source and the rotating source, and allows the operator to operate the moving frame and the rotating frame manually and smoothly. It is an object of the present invention to provide an embroidery machine for teaching that can create an embroidery pattern at the time of teaching with high quality and can be used as a dedicated machine for teaching.

[0011]

Means for Solving the Problems To solve the above-mentioned problems, a structure adopted by the invention of claim 1 is a base on which a lower thread for embroidery is arranged, and a base provided on the base, An embroidery machine head for reciprocating the upper thread side embroidery needle up and down at a position facing the lower thread side and swinging the needle at a required swing width;
A moving frame which is provided below the head and is movably provided on the base , and which is manually operated in the X-axis direction and the Y-axis direction on the base during a teaching operation; to be able to provided, while held in a state that stretched the teaching work industry sometimes embroidered cloth, and the rotation frame is rotated manually,
A rotation angle detecting means provided on the movable frame so as to detect the rotation angle of the rotary frame, mounted on said base, said movable frame
A tablet that detects the amount of movement of the moving frame as a position in the X-axis direction and the Y-axis direction by using a cursor arm that moves following, and a swing width detection that detects a swing width when the embroidery needle is swung. means, the tablet, and based on the signal from the rotation angle detecting means and the shake Ri width detecting means,
The data storage means stores the position of the moving frame, the rotation angle of the rotary frame, and the swing width of the embroidery needle, and generates teaching data.

According to a second aspect of the present invention, a centering plate having a fitting portion at the center of the rotary frame is detachably provided on the rotary frame, and the head is replaceable with an embroidery needle. the centering rod provided, by fitting the core out rod in the fitting portion of the centering plate, and configured to determine the origin position on the tablet.

[0013]

According to the above construction, the invention according to claim 1 is arranged so that an operator can create a desired embroidery pattern during a teaching operation.
When the rotating frame is rotated together with the embroidery cloth while moving the moving frame in the X-axis and Y-axis directions, the moving frame follows the moving frame.
The amount of movement of the moving frame can be detected as a position in the X- axis and Y-axis directions with high accuracy using a tablet using a cursor arm that moves, and the rotation angle of the rotation frame can be detected by the rotation angle detecting means.
You. Then, the data creating means detects the data from the tablet.
Output signal, detection signal from rotation angle detection means and amplitude detection
Out based on the means or these detection signal teaching data can create a to, can be reproduced in high quality repetition, for example, the embroidery pattern based on the teaching data in the rotation with a zig-zag sewing machine or the like.

[0014] According to a second aspect of the invention, prior to teaching work by Rukoto fitted the centering rod on the head side into the fitting portion of the centering plate provided on the rotary frame, the frame center of the rotating frame And the position of the embroidery needle can be set as the absolute center , which determines the origin position on the tablet.
Rukoto is Ru can.

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS.

In FIG. 1, reference numeral 1 denotes a base constituting the main body of the embroidery machine. The base 1 includes a plurality of legs 2, 2,... And a support plate 3 provided on each of the legs 2. The support plate 3
An insertion hole 3A for an embroidery needle 6, which will be described later, is formed in an oval shape as shown in FIG. A bobbin (not shown) for a lower thread is disposed below the insertion hole 3A, and the lower thread keeps the upper thread in a tensioned state so as to be entangled with the upper thread on the embroidery needle 6 side.

Reference numeral 4 denotes an embroidery machine head provided on the support plate 3. The head 4 raises and lowers the embroidery needle 6 on the upper thread side via the needle shaft 5 at a position facing the lower thread side. The embroidery needle 6 is moved back and forth as shown in FIG.
With a swing width W in the left-right direction (X-axis direction).

Reference numeral 7 denotes a movable frame movably provided on the support plate 3 of the base 1. The movable frame 7 is formed in a substantially rectangular plate shape as shown in FIGS. Is formed with a bearing hole 7A for rotatably supporting a rotating frame 10 described later (see FIG. 6). Rollers 8, 8,..., Such as balls, rolling on the support plate 3 are provided on the lower surface side of the moving frame 7 (see FIG. 6). It moves smoothly on the support plate 3 through the support. here,
The moving frame 7 is guided on the support plate 3 in the left and right directions (X-axis direction) and the front-rear direction (Y-axis direction) by a guide arm 9 having a parallel link mechanism. It can be moved only to.

[0019] 1 0 represents the rotation frame disposed rotatably <br/> in bearing holes 7A of the movable frame 7, the rotating frame 10 is formed as a circular ring, its inner periphery 6 The tapered hole 10A has a slightly reduced diameter as shown in FIG. Also,
A bearing (not shown) and the like are provided between the rotating frame 10 and the moving frame 7 so that the rotating frame 10 can be smoothly rotated in the bearing hole 7A of the moving frame 7. And the rotating frame 10
The embroidery cloth 11 is held in an expanded state by an embroidery frame (not shown) formed of a circular ring, and the embroidery cloth 11 is rotated together with the rotary frame 10 around the frame center O1 of the rotary frame 10.

[0020] 12 from the support plate 3 of the base 1 collision out <br/> to rearward shows a tablet which is fixed to the support plate 3, the tablet 12 is able to detect the cursor center 13A of the cursor 13 I Ri, the amount of movement of the moving frame 7 X-axis direction and Y in
It is detected as an axial position. Here, the cursor 13 is provided at the distal end of the cursor arm 14, and the base end of the cursor arm 14 is fixed to the rear end side of the moving frame 7. When the operator manually moves the moving frame 7 in the X-axis and Y-axis directions, the cursor 13 and the cursor arm 14 are moved.
Moves on the tablet 12 in the X-axis and Y-axis directions following it, and the tablet 12 detects the cursor center 13A of the cursor 13 as the position of the moving frame 7 in the X-axis and Y-axis directions.

Reference numeral 15 denotes a rotation sensor as rotation angle detecting means provided on the moving frame 7 adjacent to the rotating frame 10,
The rotation sensor 15 detects the rotation angle θ of the rotating frame 10 with respect to the moving frame 7 when the operator rotates the rotating frame 10 manually, and outputs a detection signal to a control unit 31 described later.

Reference numeral 16 denotes a control lever provided on the lower surface side of the support plate 3. The control lever 16 is operated by an operator by pushing the lever 16 in a direction indicated by an arrow A with a kneecap or the like. Thus, the swing width W of the embroidery needle 6 shown in FIG. 3 is variably controlled. The swing width W of the embroidery needle 6 is
Is detected by a swing width sensor 17 provided as a swing width detecting means provided on the back side (see FIG. 2), and the detection signal is output to the control unit 31.

Reference numeral 18 denotes a speed control pedal provided at the lower end of the base 1. The control pedal 18 is depressed by an operator, and controls the rotation speed of a spindle motor (not shown) according to the depressed amount. I do. Since the embroidery needle 6 of the head 4 reciprocates in the vertical direction in accordance with the rotation speed of the spindle motor together with the needle shaft 5, the embroidery pattern creation speed is controlled in accordance with the amount of depression of the control pedal 18. 1
Reference numeral 9 denotes a switch box provided on the lower surface side of the support plate 3. The switch box 19 is provided with a start switch 19A and a stop switch 19B for the spindle motor.

Reference numeral 20 denotes a control panel provided on the support plate 3. As shown in FIG. 4, the control panel 20 includes a start button 21 which is pressed at the start of the teaching operation.
A stop button 22 pressed when changing an embroidery thread (upper thread), a speed switching button 23 for switching the speed of creating the embroidery pattern between high speed and low speed, and a push button at the end of embroidery pattern creation. End button 24 and embroidery thread (upper thread)
The color change knob 25 for manually instructing the color selection of the embroidery thread by being manually rotated at the time of the color change, and the color change knob 2
A setting button 26 that is pressed after the color selection by the user 5 to set a color, a command button 27 that outputs a write command to a floppy disk device (not shown), and the like are provided.

The control panel 20 is provided with an origin switch 28 located at the upper right corner, and the origin switch 28 is disposed at a position deeper than the front surface of the control panel 20 so that the operator may operate the switch incorrectly. It is designed to prevent you from doing so. Then, the origin switch 28 is depressed, for example, with a tool tip such as a screwdriver when determining the origin position on the tablet 12 prior to the teaching operation, and causes the control unit 31 to store this origin position.

Reference numeral 30 denotes a display provided above the control panel 20, and the display 30 displays teaching data and the like read by the teaching operation. Reference numeral 31 denotes a control unit as a data creating means provided on the back side of the base 1 or the like. The control unit 31 is constituted by a microcomputer or the like, and its input side is the tablet 12, the rotation sensor 15, the swing width sensor 17 , A switch box 19, a control panel 20 and the like.
Etc. are connected. Then, the control unit 31 includes the tablet 12, the rotation sensor 15 and the swing width sensor 17.
Based on the signal from the controller, teaching data creation processing described later is performed.

Next, in FIGS. 5 and 6, reference numeral 32 denotes a centering jig used to determine the origin position on the tablet 12. The centering jig 32 is made of a resin material or the like into a disk shape. A centering plate 33 formed and formed with a circular fitting hole 33A as a fitting portion at a position to be the frame center O1 of the rotating frame 10, and slidable into the fitting hole 33A of the centering plate 33. And a cylindrical insertion portion 34A that fits into the insertion portion 3A.
Upwards diameter of the mounting shaft 34B from the center of 4A consists protruding from the centering rod 34., mounting shaft 34B upper end of the centering rod 34, embroidered on the tip of the needle shaft 5 shown in FIG. 3 needle 6 Replaced with and installed.

The centering plate 33 has tapered chamfers 33B and 33C formed at upper and lower ends of the fitting hole 33A, and the outer peripheral surface of the centering plate 33 is formed inside the tapered hole 10A of the rotary frame 10. A tapered surface 33D whose diameter is slightly increased upward so as to be removably fitted to the tapered surface. The centering plate 3
3 is located radially inward of the tapered surface 33D on the outer peripheral side,
A large-diameter annular groove 33E having a predetermined depth from the upper surface side is formed in a U-shaped cross section, and the annular groove 33E has a tapered surface 33D in a radial direction when the centering plate 33 is inserted into the rotating frame 10. It is designed to allow inward elastic deformation. Are formed between the annular groove 33E and the fitting hole 33A, for example, four punched holes 33F, 33F,. The centering plate 33 can be easily removed by inserting a fingertip or the like into any of the punched holes 3F.

The centering rod 34 has an insertion portion 34A.
Chamfering portions 34C and 34D corresponding to the chamfering portion 33B of the centering plate 33 are formed on both upper and lower end sides.
4C, the insertion portion 34A of the centering rod 34 is
When inserted into the fitting hole 33A, the insertion portion 34A is guided into the fitting hole 33A via the chamfered portion 33B. Then, the centering plate 33 is fitted in the tapered hole 10A of the rotating frame 10 in the direction indicated by the arrow B in FIG.
Inserting portion 34A of centering rod 34 in fitting hole 33A of No. 3
Are fitted in the direction of arrow B, whereby the frame center C of the rotating frame 10 is matched with the centers of the embroidery needle 6 and the needle shaft 5, and the origin position on the tablet 12 which is the absolute center O is determined.

The teaching embroidery machine according to the present embodiment has the above-described configuration, and its operation will be described below.

First, in the work of setting the absolute center on the tablet 12 prior to the teaching work, the rotating frame 10
The centering plate 33 is fitted therein as shown in FIGS. 5 and 6, and the centering rod 34 is attached to the distal end side of the needle shaft 5 by replacing the needle with the embroidery needle 6. Move the moving frame 7 in the X-axis and Y-axis directions so as to coincide with the axis of the centering rod 34.
The needle shaft 5 is moved in the axial direction.
4, the insertion portion 34A of the centering rod 34 is inserted into the fitting hole 33A of the centering plate 33, and the frame center O1 of the rotating frame 10 and the needle shaft 5 (embroidery needle 6) The center is set to the same state.

Next, when pressing the origin switch 28 of the control panel 20 in this state at the tip or the like of a tool, position the cursor center 13A is placed the cursor 13 on the tablet 12, the origin on the tablet 12 Set as position. Then, as long as the cursor center 13A is arranged at this origin position, a position detection signal of X = 0, Y = 0 is output from the tablet 12 to the control unit 31, and the X, Y coordinates at this time are the absolute center O ( (0,0).

Next, after the absolute center setting operation on the tablet 12 is completed, the centering plate 33 is removed from the rotating frame 10.
The embroidery cloth 11 is held in a state where the embroidery cloth 11 is extended in the rotary frame 10, and the centering rod 34 is
The embroidery needle 6 is attached to the distal end side of the needle shaft 5 and the upper thread is passed through the embroidery needle 6.
A teaching work is performed by creating a desired embroidery pattern on the embroidery pattern 1 as shown in FIG.

In this case, first, the operator moves the moving frame 7 and the rotating frame 1 to arrange the embroidery needle 6 on the starting point N0 of the embroidery pattern.
0 is manually moved and rotated as shown in FIG. 7, and the embroidery needle 6 is reciprocated to start the needle movement. At this starting point N0, the operator operates the control lever 16
Is released, the swing width W of the embroidery needle 6 is changed to W
= 0 is set, and the embroidery needle 6 is moved without swinging in the left-right direction (X-axis direction). The starting point N0 has an angle with respect to the X axis about the frame center O1 as the rotation angle θ = 0.
And X = X0 and Y = Y0 on the X and Y coordinates.
It is stored in the storage area 31A of the control unit 31 as N0 (X0, Y0, 0, 0).

At the next hand movement point N1, the embroidery needle 6 is pointed by rotating the rotary frame 10 by the rotation angle θ1 so that the line segment L indicated by the dashed line in FIG. C1 and the control lever 16
Is pushed in the direction of arrow A in FIG.
Is set to W = W1, the distance between the point C1 and the hand movement point N1 becomes W1 / 2, and actual hand movement is performed at the position of the hand movement point N1. At this time, the point C1 is (X1, Y1, θ1,
0), and the hand movement point N1 becomes N1 (X1, Y1, θ1, W1).
) Is stored in the storage area 31A of the control unit 31.

Then , the next hand movement points N2, N3, N4,
.., But by rotating the rotary frames 10 sequentially so that the line segment L contacts the arc R, the embroidery needles 6 are moved to form a zigzag embroidery pattern with the swing widths W = W2, W3, W4, respectively. For example, at the operating point N4, the point C
The distance between the point 4 and the hand operating point N4 is W4 / 2 , and the rotation angle θ =
As a result, the operation point N4 of N4 (X4, Y4, θ4, W4) with respect to the point C4 (X4, Y4, θ4, 0) is stored in the storage area of the control unit 31.

Thus, according to the present embodiment, the centering plate 3
By using the centering jig 32 including the centering rod 3 and the centering rod 34 to match the center O1 of the rotary frame 10 with the center of the needle shaft 5 (embroidery needle 6), the origin position on the tablet 12 is determined. The absolute center O can be easily set by using the X of the moving frame 7 during the teaching work performed after the absolute center setting work.
The movement amount in the X-axis and Y-axis directions can be detected with high accuracy as the position of the center 13A of the cursor moving in the X-axis and Y-axis directions on the tablet 12, and the position data of the moving frame 7 from the tablet 12 in the X-axis and Y-axis directions can be detected. Can be sequentially output.

Further, the teaching work is started from the position of the start point N0 illustrated in FIG. 7, and the control lever 16 is pushed to set the swing width W of the embroidery needle 6 to a desired size while the rotating frame 10 is set. Is rotated manually, the rotation angle 15 of the rotating frame 10 can be detected by the rotation sensor 15 and the swing width W of the embroidery needle 6 can be detected by the swing width sensor 17 shown in FIG. ,..., N4 etc.
0, Y0, 0, 0), N1 (X1, Y1, θ1, W1),.
Teaching data can be easily created by sequentially storing the teaching data (X4, Y4, θ4, W4) in the storage area 31A of the control unit 31.

Therefore, in the embodiment, the origin position on the tablet 12 can be easily determined by using the centering jig 32, and at the time of teaching operation, the signal is output from the tablet 12, the rotation sensor 15, and the swing width sensor 17 based on the signals. The position (X, Y) of the moving frame 7, the rotation angle θ of the rotating frame 10 and the swing width W of the embroidery needle 6 are stored in the storage area 3 of the control unit 31.
Stored at 1A, starting point N0, hand movement points N1, N2, N3, N4
Can easily create teaching data.

In particular, since the moving frame 7 and the rotating frame 10 are manually operated without providing a driving source or a rotating source, etc., the moving frame 7 and the rotating frame 10 are compared with those of the prior art. Thus, the operator can lightly push the moving frame 7 and the rotating frame 10 to perform the teaching work smoothly.

Further, since it is not necessary to provide the drive source on the support of the base 1, problems such as transmission of vibration from the drive source to the tablet 12 can be solved. The tablet 12 can perform position detection with high accuracy. In addition, the quality of the embroidery pattern during the teaching operation can be greatly improved, and thereafter, the quality of the embroidery pattern that is repeatedly reproduced using, for example, a rotating zigzag sewing machine or the like can be improved.

In the above embodiment, a fitting hole 33A as a fitting portion is formed in the centering plate 33 of the centering jig 32.
It has been described that the origin position on the tablet 12 is determined by inserting the insertion portion 34A of the centering rod 34 into the fitting hole 33A, but instead of this, for example, the centering plate 33 side Is provided with a fitting protrusion as a fitting portion, and a fitting hole for detachably fitting the fitting protrusion is provided on the centering rod 34.
May be formed on the bottom side of the insertion portion 34A.

[0043]

As detailed above, according to the present invention, according to the calling <br/> light according to claim 1, with a configuration to operate the moving frame and a rotary frame provided on the base manually moving frame The amount of movement is detected by the tablet using the cursor arm, and the rotation angle of the rotating frame and the swing width of the embroidery needle are detected by the rotation angle detecting means and the swing width detecting means. there is no need to provide a drive motor or the like, a drive source
And the load from the rotation source can be eliminated,
The moving frame and rotating frame can be operated manually and smoothly. Soshi
Te, can significantly reduce the operator of the burden at the time of teaching work Rutotomoni, teaching data can easily create, Ru can significantly improve the quality of the embroidery pattern. Claim 2
Prior to teaching work, the invention described in
Attach the centering plate to the
Replace and install the centering rod, and center the rod.
When the rotating frame is rotating,
Set the point where the heart matches the position of the embroidery needle as the absolute center
Can, or the like can be easily determine the position of the origin of on the tablet
Has the effect of

[Brief description of the drawings]

FIG. 1 is a front view showing a teaching embroidery machine according to an embodiment of the present invention.

FIG. 2 is an enlarged plan view of FIG. 1 with a part of a head cut away.

FIG. 3 is an explanatory diagram showing a swing width of a needle shaft and an embroidery needle.

FIG. 4 is an enlarged explanatory view of the control panel shown in FIG.

FIG. 5 is a perspective view of a main part of the teaching embroidery machine showing a state of determining an origin position on the tablet.

FIG. 6 is a longitudinal sectional view showing a disassembled state of a rotating frame, a centering plate, a centering rod, and the like.

FIG. 7 is an explanatory diagram of a hand operation point and the like showing a state in which an embroidery pattern is created by teaching.

[Description of Signs] 1 base 3 support plate 4 head 5 needle shaft 6 embroidery needle 7 moving frame 9 guide arm 10 rotation frame 11 embroidery cloth 12 tablet 13 cursor 15 rotation sensor (rotation angle detecting means) 16 control lever 17 swing width Sensor (oscillation width detecting means) 31 Control unit (data creating means) 32 Centering jig 33 Centering plate 34 Centering rod

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-63-203188 (JP, A) JP-A-3-193090 (JP, A) Jiko 62-9351 (JP, Y2) JP-B-46 1137 (JP, B1) (58) Fields investigated (Int. Cl. ⁷ , DB name) D05B 1/00-83/00 D05C 5/00-5/06 D05C 9/02-9/06

Claims (2)

(57) [Claims] And 1. A base on which the lower thread for the embroidery is arranged, provided on the base, the embroidery needle of the upper thread side on, is reciprocated below at a position opposed to the lower thread side, And a head of the embroidery machine that swings with a required swing width , and is provided under the head so as to be movable on the base, and in a X-axis direction and a Y-axis direction on the base during a teaching operation. a manual operation and the moving frame being rotatably mounted to the mobile frame, while maintaining in a state of being stretched embroidered cloth at teaching work industry <br/>, rotary frame is rotated by manual operation, a rotation angle detecting means provided on the movable frame so as to detect the rotation angle of the rotary frame, provided in front Kimoto stand, mosquitoes which moves following the movement frame
A tablet for detecting the amount of movement of said moving frame as the position of the X-axis direction and the Y-axis direction by using the Soruamu, and swing width detecting means for detecting a swing width when is swung in front Symbol embroidery needles, before Symbol tablets, and based on the signal from the rotation angle detecting means and the shake Ri width detection means, the position of the movable frame, and stores the swing width of the rotational angle and embroidery needles of the rotary frame, and a data generating means for generating teaching data An embroidery machine for teaching consisting of: 2. A centering plate having a fitting portion at the center of the rotating frame is detachably provided on the rotating frame, and a centering rod is provided on the head so as to be replaceable with an embroidery needle. 2. The teaching embroidery machine according to claim 1, wherein an origin position on the tablet is determined by fitting the centering rod to a fitting portion of the centering plate.