JPS6043148B2 - Stitching machine - Google Patents

Description

[Detailed description of the invention]

The present invention relates to a embroidery machine that performs sewing operations by reading data from a cassette tape on which embroidery data is recorded, and particularly to a embroidery machine that can identify the type of cassette tape. For example, in the automatic folding yew-stitch sewing machine disclosed in Japanese Patent Application No. 11696/1983, control data for various tying stitches is inputted on easy-to-handle magnetic tape such as a set type. It is difficult to synchronize the operation of the magnetic tape with the reading of data from the magnetic tape.
The read data is temporarily stored in static memory (RAM) inside the sewing machine.
). Two relatively small-capacity RAMs are used as static memories for control data, and control data on the magnetic tape is read into them alternately in blocks. During the computer control sequence, the computer immediately reads out the data that has just been stored and commands the sewing machine control for reading and sewing operation.The computer also controls the drive of the magnetic tape reader at the same time and actually reads the data that has just been stored. Although the reader operates intermittently, when looking at each individual pattern, the sewing control appears to be continuous and on-line control. An audio announcement is made each time a predetermined sewing progresses for operational guidance, such as a thread change instruction, and the audio signal is recorded on the magnetic tape next to the control data block. For example, the magnetic tape 1 includes control data J-2D, -2D as shown in FIG. and audio announcement information 2V1-2V. are recorded in blocks, and silent parts 25, 250, . . . are placed between these blocks to clarify the block divisions. 2
V1 contains the data 2D, voice announcement information to be played in accordance with the middle announcement instruction, 2V2 also contains the data 2D, voice announcement information to be played in accordance with the middle announcement instruction, and 2V3 contains one announcement in the data 2D2. Audio announcement information that should be played according to instructions is recorded.
These data recording arrangements are determined so that the tape is reproduced so that the progress of sewing based on the previously read data and the necessary announcements corresponding thereto are substantially continuous. FIG. 2 schematically shows the relationship between reproduction of the magnetic tape 1 and reproduction control based on reproduction data. The control data is sequentially read from the RAM that stores the magnetic tape playback data to perform intransitive sewing control, but when announcement instruction data appears in the control data, the sewing machine is stopped, the tape is driven, and the announcement information section is played back. When that is finished, the next data is read again, and sewing control or tape reproduction is performed. When reading of the RAM data is finished, the tape is driven this time, and the next control data block is reproduced and written to the RAM. In order to avoid interruption of sewing during reproduction of data and writing to RAM, data is written to the two RAMs alternately. That is, for example, data 2D1 is stored in RAM1.
While reading the data sequentially from RAM1 and proceeding with sewing, the tape is played back and the data 2D
2 is written into the RAM 2 and the data read out from the RAM 1 instructs a voice announcement, the playback position of the tape is a silent section 2S2 between 2D2 and 2V1. When all data 2D1 is read out from RAMl, the playback position is between 2V2 and 2D3, and this time data (2D2) from RAM2 is read out, while data 2D4 is played back and written to RAMl. It will be done. In this type of data playback, RAM writing, announcement playback, etc., a block end code is recorded at the end of the block, but if the tape is stopped at the same time as it is read, the remainder of the last bit of the code will be recorded next time. The next playback data or audio may not be played back clearly, or the playback zeta or playback audio may become confused due to a slight shift in the tape. In order to prevent this, as mentioned above, the silent part 2S of the predetermined length T is
1, 2S2, . The tape is stopped after the tape has been fed by a predetermined length Td, which is shorter than the predetermined length Td. According to this, the next data or announcement is played after the silence (T-Td) after the start of playing the tape, and there is no confusion in data reading or announcement playback. However, according to this, the predetermined length T
If s is short or the pause time in the audio announcement is long, the paused silent part of the announcement is mistakenly recognized as the interblock silent part 2S1, 2S2, etc., and the tape playback is stopped, and the end of the playback data or audio is Not only will the data or audio be confused, but also the reproduced data or audio will be confused the next time the tape is played. In order to prevent such confusion in the tape playback process, it is necessary to set the predetermined length Ts in the audio information recording block.
Record an analog signal that is a mixture of a background signal and an audio analog signal that cause level fluctuations with a period shorter than the tape feeding time, or use a low frequency signal outside the frequency band of the audio analog signal instead of the background signal. When recording and playing back, it is only necessary to pass through a filter and output only the audio analog signal as an announcement. According to this, even if the audio announcement is silent for more than Ts during playback of the audio information recording block, there will be no signal for Ts because there is a background signal or low frequency k signal, and the announcement will be silent. This eliminates the possibility of erroneously reading the sound as a silent part between data blocks. Since the data in the data block varies in bits below Ts, such consideration does not need to be taken. By the way, the cassette tape used in this type of automatic sewing machine is a standard type (Philips type). For this reason, although it is possible to load cassette tapes that record general music, etc., some
With the exception of 1), the sewing machine cannot detect whether the loaded cassette tape is for embroidery or music, so the operator may accidentally insert a music tape. When loaded into a sewing machine, the machine reads the music signal as sewing data, causing abnormal operation and sewing randomly. An object of the present invention is to prevent such abnormal operation of an automatic sewing machine. In order to achieve this objective, the present invention uses a tape section of a cassette tape (magnetic tape,
A leader tape, etc.) is provided with a recorded content identification means that indicates that the recorded content is sewing data, and an identification detection means for detecting the recorded content identification means is provided in the playback mechanism loaded into the sewing machine. The means is a conductive foil-like material made of aluminum or the like provided near the longitudinal end of the tape, and the identification detection means is two electrodes that can come into contact with the tape surface. According to this, it is possible to identify whether the recorded content is sewing data, music, etc. by bringing electrodes into contact with the tape surface and detecting the presence or absence of a foil-like object based on conduction or non-conduction between the electrodes. , it is possible to prevent abnormal operations due to misreading. One embodiment of the invention will now be described in detail with reference to FIGS. 3, 4a, 4b, 5 and 6. Figure 3 is a perspective view showing the outline of the structure of the embroidery machine, Figure 4a
The figure is a plan view showing the structure of the head of the cassette mechanism and its surroundings, FIG. 4b is a plan view showing the positional relationship between the tape and recorded content identification means, FIG. 5 is a block diagram showing the configuration of the control circuit, and FIG. is a flowchart showing the operation of the cassette mechanism. First, an overview of the stitching machine 10 will be explained with reference to FIG. 3. Reference numeral 11 is a cassette mechanism, which reads data from a cassette tape loaded therein and processes it in the stitching circuit shown in FIG. After performing calculations, the x-axis servo motor 20 and the Y-axis servo motor 21 are respectively driven to position the stitching frame 22, and the sewing machine motor 48 is driven to move the needle 23 up and down to perform a predetermined stitching operation. Do the following. In FIG. 4a, the identification detection means 24 consists of two electrodes 24a, 24b. Both of these electrodes have curved ends facing the magnetic tape, and the electrodes 24a and 24b move forward to come into contact with the magnetic tape 25 during tape rewinding and separate during playback. Furthermore, electrode 2
4a and 24b are insulated from each other, one of which is grounded,
The other side is pulled up through a resistor and connected to the input port (see Figure 5). On the other hand, the recorded content identification means is realized by sensing splicing tapes 26 provided near both ends of the magnetic tape 25 shown in FIG. 4b. The sensing splicing tape 26 is a conductor and is attached to the tape surface facing the identification detection means 24. The microcomputer 38 at the center of the circuit shown in FIG. 5 is of a conventional type and includes a ROM 38a which is a fixed data memory in which its own data processing calculation program is stored. It also includes a data memory circuit 39, which would normally be included in this set of microcomputers, but is shown all together in a separate frame for the sake of convenience. The data memory circuit 39 has a first memory 40 and a second memory 41 consisting of two RAM memory elements each having a capacity of 256/item. A write address counter 42 for specifying an address, a read address counter 43 for reading, and a switching command for controlling which side of the two memories 40 and 41 to operate, and a role for storing the state. It is equipped with a discriminator 44. One flip-flop is sufficient for the discriminator 44, and it will be abbreviated as DRA in the explanation of the control sequence described later. Similarly, the first memory 40 is RAMO, the second memory 4
1 is RAMl, the write address counter 42 is WACl, and the read address counter 43 is RAC, which are abbreviated in the flowchart explaining the control sequence. The output of the microcomputer 38 is transmitted through amplifiers 45 and 46 to control a cassette tape drive motor 47 of the data reader 34 on the one hand and a sewing machine motor 48 that drives the main shaft 36 of the sewing machine on the other hand. The operation output signals of the two coordinate components for each stitch based on the data read from the two memories 40 and 41, which is an important function in the output operation role of the microcomputer 38, are generated by the X-axis drive circuit 49 and the Y-axis drive circuit 50. is given as a control input to These two drive circuits 49 and 50 have the same configuration, and to explain it in terms of the Y-axis, among the positive and negative signals given as the operation output signal of the corresponding coordinate component and the numerical signal corresponding to the movement amount, Signal YDA is connected to the preset input end circle of down counter 51 and is populated by its load input LO. Then, using the output pulse from the separately provided oscillator 52 as a clock pulse, AND
A subtraction operation is carried out through the gate 53, and the N⊥ gate 53 is closed at the pollo output at the end of the subtraction. The clock pulse passing through the AND gate 53 is the positive/negative signal YP.
, YM, and is applied to the input of the pulse distributor 56 through the one of the pair of AND gates 54 and 55 whose opening gates are controlled in accordance with the gates 54 and 55, which are in operation. The pulse distributor 56 is
The servo motor 21 is a known motor that switches the excitation phase according to the direction of rotation when a pulse motor is used as in a general example. The input side of the microcomputer 38 is connected to the output signal of the synchronizing signal generator 37 mentioned above, the operation signal of the start/stop switch 35, and the signal from the identification detection means 24, as well as the signal read from the cassette tape 33. is written into either of the two memories 40 and 41 for the above-mentioned data in accordance with the state of the discriminator 44, for each unit word in which each 8 bits is one byte. 57 is connected. The signal from the cassette tape is played by the playback head 33a.
The signal after being reproduced and amplified is reproduced by the reproduction head 33a, and is connected to a switch 74 (amplifier SW) for switching the signal path after being amplified. The switch 74 is controlled by the CPU and supplies a reproduction signal to either the data input circuit 57 or the 72 speakers. To put it simply, the role of the data input circuit 57 is that the recording on the cassette tape 33 is a series of bits vertically, but the data input circuit 57 divides the bits into 8 bits and sends them to the microcomputer 38.
It is input to the 110 ports of 1 and has a function of reading the contents of each bit while determining whether it is (A) or [1]. The data recording mode of the cassette tape 33 corresponds to a binary signal depending on the signal recording width. That is, the read head 33a detects the rising and falling edges of the signal on the tape 1, and generates set and reset signals for the flip-flop 60 through separate detection circuits 58 and 59, respectively, and the signals are set and reset for the flip-flop 60. By comparing the time widths of the set operation and reset operation of step 60,
The contents of the binary signal of each bit

Judge whether it is [0] or [1]. In order to measure each time width, an AND element 61 and O
The oscillator 63 via a similar AND element 62 corresponding to the output
a pair of counters 64 each counting clock pulses from
, 65, and when reset by the output pulse of the monostable multivibrator 66, which generates a minute width pulse in response to the output of the rising edge detection circuit 59 of the tape recording signal, the counter 64 starts counting, and the counter 64 starts counting. At the same time as this counting is stopped by the output of the downward detection circuit 58, the counter 65 starts counting. Ru. Then, based on the output of the next rising detection circuit, the comparison output that determines the magnitude of the count values of both counters 64 and 65 in the comparator 67 at that point is in the form of (a)] or [1]. It is input to the storage input terminal of the shift register 68. Shift register 68. The rising detection signal shifted in the same manner is also given as a counting force of another counter 69. The shift register 68 has a length of 8 digits, and the counter 69 also has a length of 8 digits.
By generating a base count output, the contents of the read data of the shift register 68 at that time are input to the microcomputer 38 every time the shift register 68 performs eight shift operations. . The end of a data block is detected by an end sensor 70, which consists of another monostable multivibrator. That is, the 0R element 71 is configured so that the trigger input can be given by the output of either side of the rising edge detection circuit 58 or 59 of the tape recording signal.
An end sensor 70 with a somewhat larger excitation pulse width is connected through the tape, and the excitation state of the end sensor 70 is connected by a repeatedly applied trigger input while data reading from the tape continues. Then, at the end of the data lock or when all data has been read, a read completion signal is given to the 110 port of the microcomputer 38 when the operating width of the monostable multivibrator due to the last excitation input has elapsed. The start switch 35a and the stop switch 35b are mechanically interlocked, and when the start switch 35a is turned on, the stop switch 35b is automatically turned off, and vice versa. The operation up to the start of the stitching work will be explained with reference to the flowchart in FIG. The presence or absence of a cassette tape is checked by a detection means (not shown). If a cassette tape is loaded, the electrode 24
(sensor) is advanced toward the tape 25 and brought into contact with the tape surface. In this state, a rewind operation is automatically started. At this time, the microcomputer 38 monitors the signal from the electrode 24 connected to the input boat, and when this signal becomes logic RO, it determines that the specified cassette tape is loaded and starts the stabbing operation. Start. That is, the signal from the electrode 24 is normally a logic 11, but since the tape on which the splicing data is recorded has a sensing splicing tape, conduction occurs between the electrodes 24a and 24b during rewinding, and the signal is It becomes a logical ROJ. If the operator accidentally loads a cassette tape on which a signal other than the stab data is recorded, the signal from the electrode 24 will not be the logic RO, and the tape will be rewound to the end. When this state (tape end) is reached, the microcomputer determines that a tape other than the specified tape is loaded, and in order to notify the operator of this, the switch 74 (amplifier SW) is connected to the speaker 72 side and the tape is recorded. The signal is reproduced from the speaker 72. The operator notices the error and turns on the stop switch 35b to stop playing the tape, waits for the currently loaded cassette tape to be removed, and then repeats this flow from the beginning. do. The control data for the embroidery pattern is such that the recording length (block number) on the magnetic tape is determined according to the number of stitches constituting each pattern, but in this example, the data is 3 bytes per stitch. A maximum of eight data blocks are used as data blocks, and the data blocks are connected the required number of times to form one embroidery pattern data.On the magnetic tape, there is no space between each data block. Data zones DATA (0-n) of the required number of blocks are lined up between each signal zone (2S1, 2S2, etc. in Figure 1; hereinafter referred to as 1BG), and a long IBG comes at the end to complete the data. . This relationship is shown in FIG. However, the last data zone D
The length of ATA(n) will often end up being less than 8 loaves long. Each byte (hereinafter,
This memory unit consisting of 8 bits is called a word).
The leading bit serves to identify whether each word is control data or numerical data. Regarding the structure of the control data and numerical data, the first word of the three words for each stitch is the control data, and the two following words are the control data. The word is each numerical data that determines the amount of movement of the stitching frame for the X-axis component and the Y-axis component, and the capacity of each numerical data is determined because the first digit of the word is used for data identification as described above. , the remaining 7 digits have a maximum resolution of 127 steps. That is, 1 step is 0.1Tn! If n, each stitch of one component can move the frame by a maximum of 12.7 Tfrm. The numerical data for both the X and Y axis components does not have a sign bit that controls each direction of movement, but the positive or negative of the x axis component is determined by the contents of the second bit of the control data for each stitch, and 3 The positive and negative values of the Y-axis component, that is, the direction of movement, are indicated by the second one. Furthermore, if the contents of the lower four digits of the control data are other than zero, the control data at this time has the meaning of a special command signal. If the word of control data is not followed by normal numeric data, the contents of the two hexadecimal digits obtained by dividing the word of control data into four upper and lower four digits are shown in Figure 8. In the embodiment, [86] means the end of each data block, and [87] means the end of all data, that is, the end of stitching control. Although it is beyond the scope of this article, I will briefly explain when it is not used as a signal indicating the end of data, for example, in a jump instruction. Jumping is not shown in this embodiment, but when a certain stitch is abnormally long for one stitch of normal stitching, the needle bar 2 is temporarily held in the raised position. It only continues to move the embroidery frame. Figure 8 shows that the data organization of each data block continues in this manner, and control data [87] appears in a certain word of the nth block, forming one piece of stitching data. There is. In this case, the 253rd word of each data block is the address NO. 252 shows the block separation [86
] is recorded, and eight trees worth of data are stored in words in the range 0 to 251, as described above. In addition, the data for each block is stored alternately in the two memories 40 and 41 of the RAMO and RAM1, and the memories 40 and 41 have a capacity of 256/item and are suitable for this. do. Next, the operation will be explained using the flowcharts shown in FIG. 9 and subsequent figures. In response to a start command, first, the contents of the discriminator 44 are initialized. As mentioned above, the discriminator 44 is a flip-flop that selectively takes two operating states, and for convenience, these will be expressed as H and L below. Here, the initial setting is L. Subsequently, the start switch 35a is operated to ON, and in response to the ON operation, the program moves to the data reading subroutine shown in detail in FIG. 10. In the data reading routine, the contents of the discriminator 44 are checked once again, and since the first time is L as mentioned above, the discriminator 44 is set to H due to the affirmative judgment, and the contents of the first memory 40 are set to H. 7 write address counter 42 is set to address the first address. Then, a drive signal is given to the amplifier 45 to drive the cassette tape drive motor 47,
Return to the main routine shown in FIG. Therefore, the terminal sensor 70
That is, the data for one data block is stored from the nine cassette tapes 33 to the data input circuit 57 until the excitation operation is completed.
When the terminal sensor 70 is read into the first memory 40 via the amplifier 4
6 to drive the sewing machine motor 48, and the process returns to the data reading subroutine. Then, when the content of the discriminator 44 is checked, it is set to H first, so this time, based on the negative judgment, the content of the discriminator 44 is changed to L,
Then, the write address counter 42 is set to address the first address of the second memory 41, a cassette tape drive signal is issued in the same manner, and the process returns to the main routine. Then, it is checked whether the content of the discriminator 44 is L. In this case, the judgment is affirmative, and accordingly, the read address counter 43 is set to address the first address of the first memory 40. A word of the stored contents of the addressed portion is read from memory 40. If the content of the word is to instruct a voice announcement, wait until the needle reaches the top dead center, stop the sewing machine motor, set the voice flag, and set the selector switch (amplifier SW) 74 to the speaker 72 side. The valve is closed, the cassette motor of the reproducing device is driven, and when a predetermined time has elapsed since the motor was driven, the output of the retrigger pull mono-multivalve regulator 73 is monitored. The playback device plays background music (within the predetermined time period) by the motor drive.
Since the playback signal of the audio announcement block mixed with (or low frequency signal) is output, the output of the retrigger pull mono multivibrator 73 becomes H, and the background music and audio announcement are played from the speaker 72. Since the time limit of the retrigger pull mono multivibrator 73 is set to Ts, the output of the retrigger pull mono multivibrator 73 returns to L after Ts after the reproduction of the audio information block is completed. When the output of the vibrator 73 returns to L, the CPU switches the selector switch. 74
is connected to the data input circuit 57 side, the audio flag is reset, the cassette motor is stopped, and the sewing machine motor is driven. Then read the data in RAM. RAM read data instructs the announcement! If the content is not a hexadecimal [86] or [87]
If neither of these is the case, the process moves to the data output subroutine shown in FIG. The data output operation means the drive circuit 49 for both X and Y axis components.
, 50, and the contents of the second (sixth bit) and third (fifth bit) from the beginning of the control data, which is the word given here, are are determined and set at the positive and negative input terminals XP, XM of the X-axis drive circuit 49 and the same positive and negative input terminals YP, YM of the Y-axis component. The read address is then advanced to read the word of numerical data of the X-axis component from the first memory 40 and prepare it for output to the numeric output end circle to the x-axis drive circuit 49. Further, the read address is advanced and the numeral output PS to the Y-axis drive circuit 50 is similarly prepared. Therefore, the terminal sensor 70
While the excited state continues, the sewing machine waits for the arrival of the rotational phase signal of the sewing machine main shaft 36 from the synchronization signal generator 37, and the needle comes out of the work cloth (not shown) stretched over the stitching frame 2-2. A setting signal is outputted to the load terminal in accordance with the timing, and the control value for each of the XY axis components is preset to the down counter 51. As a result, the down counter 51 starts counting and subtracting the clock pulses from the oscillator 52, and while the subtraction continues, the clock pulses are sent as control signals to the servo motors 20 and 21 via the pulse distributor 56, etc. Through the operation of the stitching frame drive mechanism, the stitching frame carried by the traveler moves along the locus of a planar figure that is a composite of both components of the orthogonal coordinates.In addition, in FIG. , 21 assumes an example of using a pulse motor used in an open-loop control system, and exemplifies the use of a circuit element called a pulse distributor 56 for that purpose, but it can also be used as a servo motor. The motor is not limited to a pulse motor, so if you use other types of motors, you can use an appropriate circuit element to control the rotation angle by feeding back the amount of motor rotation.In this way, you can control the stitches. After the signal is output, the control sequence increments the read address counter 43 and returns to the main routine to continue the sequence for the next stitch.That is, whether the content of the control data for the next stitch instructs an announcement or not. Alternatively, while checking whether it is [86FI] or [87H] each time, the control of the data output subroutine is repeatedly executed during the negation of the data output subroutine.
When the excitation of the cassette tape drive motor 47 ends, that is, when the end of reading one data block from the cassette tape 33 is detected, the drive output for the cassette tape drive motor 47 is stopped. As mentioned above, the number of stitches for seven data databases is a maximum of 8 stitches, but the time required to read the data is estimated to be completed during approximately 5 rotations of the upper shaft 36 of the sewing machine. After completion, both servo motors 20 and 2 are operated until the stored data in one of the memories 40 and 41 is read out.
Control within that data block of 1 is executed. When the reading of the contents of one memory is completed while the stabilization control continues, the process moves to the data reading subroutine shown in FIG. 10 in response to the detection of [86H] in the main routine, and the reading is completed. The data for the next data block is read into the side memory again. In this case, the sewing machine 1 continues the stitching frame control operation, and reads data from the cassette tape 33 by an interrupt as shown in FIG. 12 between the control operations. In this way, as the automatic control of the stitching progresses, the cassette tape 3
The reading operation of step 3 continues intermittently, during which time the two memories 40 and 41 alternate between reading and reading, and the sewing machine as a whole is able to stitch one pattern without interruption. automatic control is in progress. Therefore, when the control data read content [87H] during the main routine is detected, in response to the signal from the synchronization signal generator 37,
In order to stop the sewing machine at the position where the needle bar is raised, the sewing machine motor 48 is stopped by appropriate sewing machine motor stop control, although detailed illustrations and explanations are omitted. In the embodiments described above, the sensing splicing tape 26 was used as the recording content identification means, and the electrode 24 was used as the identification detection means. means,
Furthermore, a special signal can be recorded on a magnetic tape and detected by magnetic means. As explained in detail above, the control device shown in FIG. 5 uses the magnetic tape 1 as a large-capacity control data recording carrier for automatic stabbing control, and performs the reading operation of the magnetic tape 1 and the actual stabbing. In order to facilitate synchronized operation with the operation of the sewing machine, the data read from the magnetic tape 1 is temporarily stored in a static memory in the control circuit. using pcs,
In the configuration of the computer that performs the sequence control operation, there is provided means for determining the operation selection state of the two memories and storing the state as an index, so that the magnetic tape read operation is performed intermittently. However, during this time, the two static memories mutually exchange the roles of reading and reading, so that the sewing machine movement as a whole is not interrupted, giving the appearance of online control. , automatic embroidery frame control for each embroidery pattern is assumed to proceed. Complex stitching patterns can be completed in a consistent continuous motion via magnetic tape without the need for particularly large amounts of static memory in the control circuit, and the operator can perform no operations during the process. It's not necessary. A sewing machine equipped with the means of the present invention will not operate abnormally due to incorrect loading of a cassette tape, and will not damage the product being embroidered.

[Brief explanation of the drawing]

FIG. 1 is a plan view of a magnetic tape recording digital control data and voice announcements, and FIG. 2 is a flowchart showing sewing control of a sewing machine using the tape. Figure 3 is a perspective view showing an example of the structure of the embroidery machine, and Figure 4a
Figure 4b is a plan view of a cassette mechanism showing an embodiment of the present invention, Figure 4b is a plan view of a tape and recorded content identification means showing an embodiment of the present invention, and Figure 5 is the configuration of a control device for a embroidery machine. 6 is a flowchart showing the operation of the cassette mechanism, FIG. 7 is a plan view showing the data arrangement on the tape, and FIG. 8 is a plan view showing the data content of each data block shown in FIG. 7. Figure, Figure 9, Figure 10, Figure 11
This figure and FIG. 12 are flowcharts showing the control operation of the microcomputer CPU shown in FIG. 1,2
5: Magnetic tape, 2D1, 2D2,...: Control data recording block, 10: Stitching machine, 11: Cassette mechanism (playback mechanism), 20: X-axis servo motor, 21: Y-axis servo motor, 22: Stitching frame , 23: needle, 24: electrode, 2
6: Sensing splicing tape (foil-like material), 33
: Cassette tape, 35a: Start switch, 35J
b: Stop switch, 38: Microcomputer,
57: Data input circuit.

Claims (1)

[Claims] 1. In a sewing machine that performs sewing operations by loading a cassette tape and reproducing the printing data recorded on this tape: Conductive foil provided on the tape of the cassette on which the printing data is recorded. a reproducing engine that reproduces the recorded signal of the cassette tape; two mutually insulated electrodes that are capable of contacting the tape surface and provided at a position where the foil-like object can be detected; A embroidery machine characterized by the following features: