JPS6145794A - Sewing machine equipped with detachable external memory - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a sewing machine equipped with a removable external memory, and more particularly, to a sewing machine equipped with a removable external memory. The present invention relates to a technique for preventing the shape of a pattern from collapsing or interference between a sewing tool such as a presser foot or a needle plate and a sewing needle even when the sewing machine presses a presser foot or a needle plate.

A type of conventional sewing machine includes an internal memory that is provided in a sewing machine frame and that permanently stores data regarding a first pattern group consisting of a plurality of predetermined patterns, and that is removable from the sewing machine frame. an external memory for fixedly storing data regarding a second pattern group consisting of a plurality of patterns different from the patterns in the first pattern; a pattern combination means for sequentially specifying and combining desired patterns in both the pattern groups; and a sewing machine. Some machines include pattern selection means for selecting each pattern from the plurality of combined patterns in accordance with the designated order during operation. In such a sewing machine, the internal memory and the external memory are selectively selected by a changeover switch, and the stitch forming means is operated in accordance with stitch data regarding a desired pattern selected from among the various types of patterns stored in the memory. It has the feature that a desired pattern can be formed by operating the .

Problems to be Solved by the Invention However, when forming a plurality of combined patterns including at least one pattern stored in an external memory,
If the external memory is accidentally removed from the sewing machine frame,
The swinging position of the sewing needle and the amount and direction of feed of the work cloth may be disturbed, causing the shape of the pattern being sewn to collapse and damaging the sewn product, or causing interference between the sewing tool and the sewing tool such as the presser foot or throat plate. There was a risk that the

Means for Solving the Problems The present invention has been made against the background of the above-mentioned circumstances, and its gist is to provide the above-mentioned internal memory, external memory, pattern combination means, and seam. In a sewing machine equipped with a forming means, (1) a temporary storage memory provided within the sewing machine frame and having a storage capacity capable of temporarily storing data regarding one pattern; and (2) patterns in a second pattern group. (3) a writing means for writing code signals of each pattern belonging to the second pattern group among the plurality of combined patterns into the code memory in accordance with the specified order; And (4
) reading means for reading each code signal from the code memory in accordance with the designated order in connection with the completion of forming each pattern belonging to the second pattern group among the plurality of combined patterns; (6) data transfer means for transferring and writing data related to the pattern specified by the code signal from the external memory to the temporary storage memory; and (6) storing data to be formed in the stitch forming means. memory selection means for selecting one of the internal memory and temporary storage memory as the memory for storing the data by determining whether the pattern selected by the pattern selection means belongs to the first pattern group; And (7
) detecting means for detecting that the external memory is removed from the sewing machine frame while the temporary storage memory is selected; and (8) detecting means for detecting that the external memory is removed from the sewing machine frame; The present invention further includes a stop means for automatically stopping operation of the sewing machine in connection with completion of reading all data in the memory.

Operation and Effect of the Invention With this arrangement, the code signals of each pattern belonging to the second pattern group among the plurality of combined patterns are written into the code memory by the writing means in the designated order, while the code signals of the combined patterns are In connection with the completion of formation of each pattern belonging to the second pattern group among the plurality of patterns, each code signal is read out from the code memory by the reading means, and data regarding the pattern indicated by the read code signal is read out. The data is then transferred to the temporary storage memory and stored by the data transfer means. Then, the memory selection means determines whether the pattern selected by the pattern selection means belongs to the first pattern group or not, and the internal memory and the temporary storage memory are selectively selected according to the result of this determination. is selected and the pattern is sewn. and,
During such sewing, if the detection means detects that the external memory is removed from the sewing machine frame while the temporary storage memory is selected.

Upon completion of reading all data in the temporary storage memory, the stopping means automatically stops the operation of the sewing machine. Therefore, even if the external memory is removed from the sewing machine frame while the temporary storage memory is selected, the sewing machine continues to operate until all data in the temporary storage memory is completed. This eliminates any disturbance in the shape of the pattern or interference between the sewing tool such as the presser foot and the sewing needle.

EXAMPLE Hereinafter, an example of the present invention will be described in detail based on the drawings.

FIG. 1 is a diagram showing the basic configuration of this embodiment, and an internal memory 12 provided in a sewing machine frame 10 indicated by a dashed line stores each pattern in a first pattern group that is frequently used. A plurality of groups of stitch data are stored. An external memory 14 such as a ROM block that is removably attachable to the sewing machine frame 10 stores a plurality of groups of stitch data regarding each pattern in the second pattern group that is used relatively infrequently. The pattern combination means 16 is for specifying one of the memories 12 and 14, and is provided so as to be able to sequentially specify desired patterns from the rain pattern group and combine one group of patterns. The combined patterns of one group are sequentially selected by the pattern selection means 18 during operation of the sewing machine according to the designation order of the patterns at the time of designation of the combination. Further, code signals representing patterns in the combined one group of patterns and belonging to the second pattern group are sequentially written into the code memory 22 by the writing means 20. During sewing operation of the sewing machine, the coat signal stored in the code memory 22 is designated by the reading means 24 in connection with the completion of forming each pattern belonging to the second pattern group in the combined one group of patterns. The patterns are sequentially read out according to the order, and the data regarding the pattern specified by the read code signal is read out from the external memory 14 by the data transfer means 28 and transferred into the temporary storage memory 26. The memory selection means 30 determines whether or not the pattern selected by the pattern selection means 18 belongs to the first pattern group. The stitch data from the temporary storage memory 26 is allowed to pass when it is determined that the stitch data belongs to the second pattern group. Each stitch data in the memory selected by the memory selection means 3° is transmitted to the control means 3.
2, the stitch data is read out in synchronization with the rotation of the main shaft of the sewing machine (not shown), and the read stitch data is supplied to the stitch forming device 34, where each stitch of a desired pattern is formed.

On the other hand, while the temporary storage memory 26 is selected by the memory selection means 3o, the control means 32 detects detachment of the external memory 14 from the sewing machine frame 1o in cooperation with the memory attachment/removal detection means 36; Activate the stop means 38. The stopping means 38 determines whether the data output from the temporary storage memory 26 is data before completion of pattern formation, for example, stitch data from three stitches ago, and determines whether the data is stitch data from three stitches ago. When it is determined that this is the case, the motor drive control device 40 starts preparations for an automatic stop operation to slow down the sewing machine morph 42, and when all the stitch data in the temporary storage memory 24 has been read out, the motor drive control device 4o stops power supply to the sewing machine morph 42. This stopping means 3
8 and the motor drive side tMj device 40, if the external memo 4 is removed while a pattern belonging to the second pattern group in the combination pattern is being formed, the pattern being sewn is When the formation of the ζ is completed, the ζ sewing machine is automatically stopped.

FIG. 2 shows the appearance of the sewing machine of this embodiment, in which the sewing machine frame 10 includes a bed portion 44 and a pillar portion 4 erected thereon.
6. It basically consists of an upper arm part 48 supported horizontally and in a cantilevered manner by this pillar part 46. A head 50 provided at the other end of the upper arm portion 48 is provided with a needle bar 52 capable of vertical movement and lateral rocking movement, and a sewing needle 54 is attached to the lower end of the needle bar 52 . Also, head 5
0 is provided with a start/stop switch 51 for starting/stopping the sewing machine each time the sewing machine is pressed. A feed tooth 56 to which a four-movement feed is applied by a known feed mechanism is arranged near the needle drop point on the belly button F portion 44, and its feed movement is controlled by a feed adjuster (not shown).

A display board 58 is fixed to the front surface of the upper arm portion 48 on which the shapes of each pattern belonging to the first pattern group, which is relatively frequently used, are posted together with the pattern number of two fingers. In addition, on the front side of the pillar part 46, there are 10 input keys 60 engraved with numbers "0" to "9" for specifying and inputting the pattern number, and for combining multiple patterns. A combination key 62 that can be operated is provided. This combination key 6
2 corresponds to the pattern combining means.

Furthermore, a numeric display 64 is provided to visually display the pattern number input using the input key 60, and
A memory selection switch 66 and a light emitting diode 68 are arranged. The memory selection switch 66 selects the internal memory 1 for storing the first pattern group that is relatively frequently used.
4 and the external memory 14 for storing a second pattern group that is relatively infrequently used. The light emitting diode 68 is used to display the selected state of the external memory 14.

The external memory 14 is housed in a memory cassette 70, and the memory cassette 70 is removably inserted into a slot 72 formed horizontally in the pillar section 46, as shown in FIG. The external memory 14 is installed in the slot 72 as a central processing unit (hereinafter referred to as CPU).
A connector 76 for connecting to the memory cassette 74 is provided, and a limit switch 78 that is activated when the memory cassette 70 is installed is fixed to the sewing machine frame 1o. When pushed to the position of the virtual line, the external memory 14 is connected to the CPU 74 via the connector 76, and the external memory 14 is connected to the CPU 74 via the connector 76.
Mounting of the memory socket 70 is detected based on the presence or absence of the case slot 1 to mounting signal PS4 outputted from the memory socket 70. Therefore, this limit switch 78 corresponds to the memory attachment/detachment detection means 36. In addition, C.P.
The U 74 includes various counters C1 to C5, registers, etc. in the form of software or hardware.

The sewing machine configured as described above is provided with a control circuit shown in FIG. 4. That is, the memory selection switch 66 supplies the external memory selection signal PS1 to the CPU 74, which becomes a low level when operated to the selection position of the internal memory 12 and becomes a high level when operated to the selection position of the external memory 14. Based on this external memory selection signal PSl, a display ``DM'' for lighting the light emitting diode 68 is output. The encoder 82 outputs an input operation signal PS2 and a food signal PN to the CPU 74 in response to the input operation of the input key 60. The code signal PN corresponds to the pattern number of the desired pattern input using the input key 60, and the input operation signal PS2 indicates that the second finger number was input by operating the input key 6o. be. The CPUs 7,1 output a numeric display signal DN for displaying the pattern number to the numeric display 64 in accordance with the code signal PN. The combination key 62 is the input key 60
When operated between the pattern number input operations, it specifies the combination of patterns specified before and after this operation, and when operated, outputs a high-level combination operation signal PS3 to CP'<174. .

The head address memory 84 stores a large number of head address signals HAD representing the head address of a series of stitch data regarding each pattern stored in the internal memory 12 and the external memory 14, and is converted from the code signal PN. When the pattern code signal PAC is supplied from the CPU 74, one head address signal HAD corresponding to the pattern code signal PAC is output. Note that in the external memory 14, the number of addresses prepared for each pattern is the same regardless of the type of pattern, and even when using a different external memory 14, the external memory in the first address memory 84 The first address signal H for
There is no need to change AD.

In addition, each of the internal memory 12 and the external memory 14 contains a series of stitch data SD for forming each pattern, and for identifying the stitch three stitches before the end of the pattern (last stitch). Stop instruction data SPD, which is output together with the stitch data of , and end data PED, which is output following the stitch data specifying the final stitch and does not indicate the end of the pattern, are stored.

The intermediate memory 86 is prepared to sequentially store the 110th address signal HAD outputted from the first address memory 84 in response to the operation of the combination key 62, and when the sewing machine motor 42 is stopped, The head address signals H and AD are sequentially stored in the addresses specified by the counter C1 in the CPU 74 which acts as the pattern selection means 18 shown in FIG. Based on the designation, the start address signal -υHAD is output sequentially. Fourth
Input key 60 shown in the figure. Combination key 62. Memory selection switch 66, encoder 82. Start address memory 84
．． The intermediate memory 86 constitutes the pattern combining means 16 shown in FIG.

The CPU 74 loads the head address signal HAD outputted from the intermediate memory 86 into the counter C2 while the sewing machine motor 42 is operating, and loads the high level signal HAD generated from the timing signal generator 88 when the sewing needle 54 reaches a predetermined position. The reading means 24 in response to the timing pulse TP of
The counter C2 corresponding to
advance from That is, the timing pulse TP is added and counted in addition to the contents of the head address signal HAD. The contents of the counter C2 are supplied to the memory designated by the memory selection switch 66, and among the multiple groups of stitch data stored in the memory, one group of stitch data SD is output to CPt, J74. be done. C.P.
U74 transfers the stitch data SD to the actuator drive circuit 90.
This causes the needle swing actuator 92 to
Then, the feed actuator 94 is driven to determine the swinging position of the needle bar 52 and the adjustment position of the above-mentioned feed adjuster. Each stitch data SD consists of a pair of needle position data and feed data, and each stitch position is specified by each stitch data SD. These actuator drive circuits 90. The needle swing actuator and feed actuator 94 constitute the stitch forming device 34 of FIG.

The motor drive control device 40 controls the operation of the sewing machine motor 42-, and when the start/stop switch 51 is operated while the sewing machine motor 42 is stopped, a high-level start signal representing the operation of the sewing machine motor 42 is generated. CM4-CP
While outputting power to the sewing machine motor 42, driving power is supplied to the sewing machine motor 42 to rotate it.
When the start/stop switch 51 is operated during the operation of step 2, the start signal CM is set to a low level, and the supply of drive power to the sewing machine motor 42 is stopped, causing the sewing machine motor 42 to stop operating. . The motor drive control device 40 also receives a motor low speed command signal I1 from the CPU 74.
According to M, the supply of drive power to the sewing machine motor 42 is suppressed to rotate the sewing machine motor 42 at a low speed, while
The supply of driving power to the sewing machine motor 42 is stopped in accordance with the stop command signal SM from the sewing machine motor 42.

The temporary storage memory 26 stores all the data corresponding to the first pattern in the sewing pattern in the pattern belonging to the second pattern group among the plurality of patterns combined by the combination means 16. This is a relatively small capacity memory for temporarily storing (a series of stitch data). Also, code memory 2
2 is a code signal representing a pattern belonging to the second pattern group among the combined patterns (in this embodiment, the leading address signal H
A and D) are stored in the order of combination.

Next, the operation of the sewing machine constructed as described above will be explained according to the flowcharts shown in FIGS. 5 to 7. FIG. 5 mainly shows the operation of the sewing machine before the □ operation, and FIGS. 6 to 7 show the operation of the sewing machine during sewing. In addition, in the flowchart, the high level state of the signal is represented by "1", and the low level state of the signal is represented by "0".
Represented by -1.

In Fig. 5, step S1 is performed at the same time as the sewing machine is powered on.
The initial settings of the internal counter CL C
2 and internal counters C3, C4, and C5 used in the data temporary storage routine described later are reset, and a large number of flags CF prepared inside the CPU 74 are reset.
BF, MF, CMF, and THF are set to "0". Next, step S2 is executed, and it is determined whether or not the start signal CM is generated, in other words, whether or not the sewing machine motor 42 is rotating. The sewing machine motor 42 is rotating, and the sewing machine! When the sewing machine is in operation, each step is executed according to the flowchart shown in FIG. 6. First, the operation of the sewing machine when the sewing machine motor is not in operation will be explained.

In steps S3 and S4, it is determined whether the external memory selection signal Psi and the cassette loading signal PS4 are generated, respectively. External memory selection signal PS1
occurs and it is determined that the cassette installation signal PS4 is not generated, it is an abnormal state in which the memory cassette 70 is not installed even though the external memory 14 is selected by the memory selection switch 66. Because there is
Steps S5 and S6 are executed and the light emitting diode 6
8 is displayed blinking, and the motor stop command signal SM
is output to the motor drive control device 40, and the operation of the sewing machine motor 42 is reliably stopped. However, if it is determined that the external memory selection signal PS1 is generated and the cassette loading signal PS4 is generated, then the external memory ]4 is selected, so step S8 is executed and the flag BF is set. If the content is "11" and it is determined that the external memory selection signal PS1 is not generated, the internal memory 12 is selected, so step S7 is executed and the content of the flag BF is set to "0". ”.

That is, the flags BF represent the selected state of the external memory 14.

Next, step S9 is executed to determine whether the input operation signal PS2 has been generated. If there is no input operation using the input key 60, step S10 is executed to determine the contents of the flag MF, but if the large key 60 is operated and a desired pattern number is input, step S10 is executed. Sl
1 is executed and the code signal PN corresponding to the pattern number is stored in the memory M1. Then, step S12 is executed to determine whether the content of the flag BF is "1". If the content of the flag BF is "0", that is, if the external memory 14 is not selected, step S13 is executed to convert the code signal to the internal memory. In the case of this embodiment, the pattern in the internal memory 12 by the input key 60 is specified by two-phase numerical values from "00" to "99", so the code signal representing the two-phase pattern number remains unchanged. be done. Then, step S14 is executed to determine whether the content of the combination flag CF is "1". The content of combination flag CF is r
lJ, and if the combination has been input, step S
15 and 316 are skipped, but if they are not combined, steps S15 and S16 are executed and the contents of flag MF are cleared to rOJ and the contents of intermediate memory 86 are also cleared. Next, step S'17 is executed, and the start address HAD is read from the start address memory 84 based on the pattern code signal PAC' converted in step 313.
AD is the intermediate memory 861 at the location specified by the counter C1.
Stored in W. Initially, since the counter C1 is cleared, the data is written to address O in the intermediate memory 86. After the content of the combination flag CF is set to "0" in step S19, the steps from step 310 onwards are executed.

When the external memory 14 is selected by the memory selection switch 66 and the attachment of the memory cassette 70 is detected by the rimming switch PS4, the content of the flag BF is determined to be "1" in step S12. In step S20, external memory conversion is performed, and the pattern code signal PA is converted based on the code signal PN.
C is determined. In the case of this embodiment, the designation of the pattern in the external memory 14 is also designated by the input key 60 of the minus digit pattern number from "00" to "99", which indicates that the pattern is in the external memory 14. For example, enter 10 in the pattern number.
0 is added to the pattern code signal P representing the pattern number of the second finger.
It is considered as AC. Then, steps 321 to 324 are executed, and the start address HAD is read out from the start address memory 84 based on the pattern code signal PAC converted in step 320, and this start address HAD is read out by the counter C3 in the code memory 22. It is written to the specified location and the content of flag MF is set to "1". That is, steps 320 to S
Reference numeral 23 corresponds to the writing means 20 for writing code signals of patterns belonging to the external memory 14 into the code memory 22 in the selected order. The flag MF indicates that the pattern selected by the input key 60 belongs to the pattern group stored in the external memory 14.

Next, step S25 is executed to set the combination flag CF.
It is determined whether the content of is "1" or not. If the pattern stored in the external memory 14 is simply to be sewn, the determination in step S25 is "NO", so the steps from step S16 described above are executed and the intermediate memory 86 is cleared, but the pattern stored in the external memory 14 is If a combination including at least one of the patterns to which it belongs is specified, step S
Since rYEsj is determined in step 25, the steps from step 317 described above are executed, and the first address signal HA is stored in the intermediate memory 86 without being cleared.
D is written.

In step SIO, the content of flag MF is "0"
In other words, if it is determined that the pattern in the external memory 14 is not selected, step S26 is skipped and steps 327 and subsequent steps are executed. In step S27, the content of the combination operation signal PS3 is determined, and if the combination key 62 is not operated and the pattern is made by itself, rNOJ is determined in step S27. Steps S28 and S29 are skipped and steps 330 and subsequent steps are executed. However, step S
If it is determined in step 27 that a combination operation using the combination key 62 has been performed, steps 328 and S29
is executed and the counter C1 is advanced ("1" is added to the counter C1), and the content of the combination flag CF is set to "1".

That is, by repeating the execution of the above steps, in the selected state of each of the external memory 14 and internal memory 12, if there is no combination of patterns, 0 of the intermediate memory 86 is always stored.
The head address signal HAD is written to the address, but if there is a combination designation input, the head address HAD corresponding to the pattern number is stored in the intermediate memory 86 in the designated order of the pattern number.
At the same time that AD is sequentially written, the start addresses HAD of the patterns belonging to the second pattern group are sequentially written into the code memory 22.

In step S30, the number 1 display number DN is outputted according to the contents of the memory M1, and the number is displayed on the number display 64. In the memory M1, the step S
Code signal PN representing the pattern number selected in ll
is stored, and the pattern number entered using the input key 60 will be displayed on the number display 64. Next, step 331 is executed and the contents of flag BF are changed to "
1'', in other words, if it is determined that the external memory 14 is selected and the memory cassette 70 is installed, step 332 is executed and the display signal DM is output to the light emitting diode 68. light emitting diode 6
8 is lit continuously.

However, in step S31, the contents of flag BF are changed to "
0'', step S32 is skipped and the light emitting diode 68 is not turned on.

Here, if it is determined in step 326 that the cassette loading signal PS4 is not generated, the memory card 70 has been removed even though the pattern in the external memory 14 has been selected. Therefore, step S
33 and S34 are executed, the light emitting diode 68 is displayed blinking, and it is determined whether the timer has expired or not.

This timer is used to count the time since it is determined in step S26 that the force center attachment signal PS4 has not been generated, and the execution from step 326 onward is repeated before a predetermined certain period of time has elapsed. However, after the time has elapsed, it is determined in step S34 that the timer has expired, so steps S35 to S38 are executed to force the selected pattern to form a straight stitch.

That is, in step 335, the intermediate memory 86 is cleared, the parenthesis counter c1 is reset, and in step S36, the leading address signal for forming a straight stitch is generated in the intermediate memory 86 at the address (address 0) specified by the counter. HAD is written, and in step S3'7, a code signal PN representing the pattern number of the straight stitch is stored in the memory M for display.
1, and in step 338 each flag B
The contents of F, MF, and CF are set to "0".

By repeating the above steps, when the input key 60 and the combination key 62 are operated to sew a group of patterns including the patterns belonging to the external memory I4,
In the intermediate memory 86, the leading atto L nos signals HA-D corresponding to the patterns to be sewn in the designated combination order are sequentially stored, and in the code memory 22, the second pattern group among the plurality of combined patterns is stored. Code signals corresponding to each pattern belonging to the sewing machine are stored in the order of the patterns to be sewn.

If it is determined that the start signal CM is "1" in step S2, that is, if it is determined that the sewing machine motor 42 is in operation, step S40 in FIG.
is executed to reset the contents of C1 and C3 outside the current range, and at the same time, the data temporary storage routine of step S42 is executed. In each data temporary storage routine, as shown in detail in FIG. 7, first, in steps SRI and SR2, it is checked whether the contents of the counter C1 are "0" and whether the contents of the flag CMF are "1" or not. will be judged. This flag CMF indicates that the head address signal HAD read from the intermediate memory 86 is
2 or the external memory 14. Initially, the content of the counter C1 is "0", so step S is performed regardless of the flag CMF.
R3 is executed and the start address memory HAD is read out from the location specified by the counter C3 in the code memory 22, and step SR4 is executed and the read out start address signal HAD is "0" or not. will be judged. The content read from the code memory 22 is “0”.
'', that is, if the head address signal HAD is not stored, the data temporary storage routine is terminated, but if the head address signal HAD is stored, steps SR5 to SR7 are executed.

In other words, the contents of counter C4 include the first address signal HA.
At the same time, the start address signal THAD for reading stitch data from the temporary storage memory 26 is loaded into the contents of the counter C5. Generally, the temporary storage memory 26 stores only stitch data forming one pattern, so the readout start address is constant even if the pattern is different, and therefore a constant value is used for THAD. Note that the counter C4 is for addressing the external memory 14, and the counter C5 is for addressing the temporary storage memory 26. Then, in step SR7, the stitch data is read from the address specified by the counter C4 of the external memory I4 and written into the temporary storage memory 26 at the location specified by the counter C5.

Then, in step SR8, the temporary storage memory 26
It is determined whether or not the data written in is the end data PBD. If it is not the end data PED, step SR9 is executed, and after counters C4 and C5 are advanced, steps SR7 and subsequent steps are repeatedly executed. Ru. Among the repetitions of the above steps, if it is determined that the end data PED has occurred in step SR8 (in other words, if the data transfer has been completed), step 5RIO
is executed and the counter C3 is advanced, then the data temporary storage routine is terminated.

That is, in the data temporary storage routine, if the content of counter C1 is "0" or
Even if the content of 1 is not "0", if the read start address HAD belongs to the external memory 14 (if the flag CMF is "1"), the counter C3 changes the start address signal HAD to the code When read from the memory 22 (when the start address signal HAD exists), a series of stitch data for sewing the pattern corresponding to the start address signal HAD is stored in the external memory 1.
4 to the temporary storage memory 26.

That is, the take temporary storage routine of step S42 constitutes the data transfer means 28 of FIG. 1.

Returning to FIG. 6, following the data temporary storage routine of step 342, step S43 is executed, and the intermediate memory 8
6, the head address signal HAD is read out according to the counter C1, and step 344 is executed.
The read head address signal HAD is stored in the internal memory 12.
It is determined whether the data belongs to the external memory 14 or to the external memory 14. This determination is made based on whether the numerical value (address) represented by the head address signal HAD is greater than a certain value N. Generally, internal memory 1
Since the address of the external memory 14 is assigned following 2, for example, if an address smaller than 2000 is used for the internal memory 12, the above numerical value N is set to 2000, and if it is not larger than that, then It is determined that it belongs to internal memory I2. When it is determined that the head address signal HA D belongs to the internal memory 12 in this way, steps 345 and 346 are executed, the contents of the flag CMF are set to "0", and the head address signal HA D is stored in the counter C2. Address signal HAD is loaded. Conversely, the head address signal HAD read out from the intermediate memory 86 by the counter C1 is sent to the external memory 1.
4, steps 347 and 348
is executed, the content of the flag CMF is set to "1", and the start address THAD for addressing the temporary storage memory 26 is loaded into the lid C2.

Then, step S49 is executed and the flag CMF
It is determined whether the content of is "1" or not, and if it is not "1", step S50 is executed and stitch data SD is read out from the internal memory 12 according to the counter C2,
If it is "1", step S51 is executed and the stitch data SD is read out from the temporary storage memory 26 according to the counter C2. That is, the steps S44 to S51 correspond to the memory selection means 3o in FIG. 1. Next, step S52 is executed, and it is determined whether or not end data PED has occurred. However, since it has not occurred at the beginning of sewing, steps 353 and subsequent steps are executed. In step S53, the stitch data SD is output to the actuator drive circuit 90 to form one stitch position, and in step 354 it is determined whether or not the timing signal TP has been generated. After step S55 is executed and the counter C2 is advanced, steps 349 and subsequent steps are executed again. However, if it is determined in step S54 that the timing signal TP has not yet been generated, step S56 is executed and the content of the flag CMF is set to "1".
At the same time, step S57 is executed to determine whether or not the cassette loading signal PS4 is generated. If the content of the flag CMF is "0" or if the cassette loading signal PS4 is generated even if the content of the flag CMF is "1", that is, if the read start address HAD is In a normal case where the memory cassette 70 is attached even if it belongs to the external memory 14 or the memory cassette 70 belongs to the external memory 14, it is determined in step 358 whether or not the activation signal CM is present. If so, step S59 is executed and the pattern number is displayed on the number display 64 according to the memory M1, and steps 354 and subsequent steps are repeatedly executed. However, if it is determined in step S58 that the activation signal CM is not generated, steps S60 and S61 are immediately executed, the counter C1 is reset, and the content of the flag CF is set to "0". Step 82 and subsequent steps in FIG. 5 are repeatedly executed.

In steps S56 and S57, the flag CM
If it is determined that the content of F is "1" but the cassette loading signal PS4 is not generated, the memory cassette 7
Since the sewing machine 0 is in a state where it appears to have been removed while the sewing machine is in operation, steps S62 to S65 are executed to prepare for automatic stopping of the sewing machine. That is, step S
In step S62, it is determined whether or not the stop instruction data SPD has occurred, and if it has not occurred, steps S63 and S64 are skipped, but the series of stitch data S
When it is determined that the stop instruction data SPD has been generated, for example, three stitches before the last stitch D, step S63 is executed and a motor stop instruction signal SM is output to the motor drive control device 40 to control the sewing machine motor. 42 is operated at low speed, step S64 is executed, and the content of the flag THF is set to "1". Then, step S65 is executed and the abnormality display code signal is stored in the memory M1. Following this step S65, steps 359 and subsequent steps are executed, so an abnormality display such as rEEJ is displayed on the numerical display 64 according to the abnormality display code signal stored in the memory M1, and steps 354 and subsequent steps are executed again. Ru.

While repeating the above steps, if it is determined in step S52 that the end data PED has occurred, step S66 is executed and the contents of the flag THF are changed to "
1" is determined. If it is determined in step S66 that the content of the flag THF is not "1", in other words, if it is determined that the motor low speed command signal LM has not been output yet, step S67 is executed and the counter C1 advances. At the same time, step 358 is executed to read the head address signal HAD from the intermediate memory 86 according to the counter C1, and then step S69 is executed and the head address signal HAD read from the intermediate memory 86 is 10''. It is determined whether or not there is. In this step 369, it is determined whether or not this is the last of the combined patterns. If it is determined in step S69 that the head address signal HAD read from the intermediate memory 86 is not 10'', the sewing of the combined pattern should be continued, so steps 342 and subsequent steps are executed. , the head address signal HAD is "0" in step 369.
If it is determined that this is the case, then the sewing of the series of combined patterns ends with the current sewing, so steps 340 and subsequent steps are executed in preparation for repeated sewing of the combined pattern. That is, in step S40, the counter C1 is reset and the first one of the combined patterns is read out again.

However, in step S66, the flag THF is set to "
1", in other words, if it is determined that the motor low speed command signal LM has already been output, step 3.70 is executed and the flag THF is set to "0", and step S71 is executed, a motor stop command signal SM is output to the morph drive control device 40, and the sewing machine motor 42 is automatically stopped.

That is, if the memory socket 70 is forcibly pulled out while sewing a combination pattern, the sewing machine motor 42 is driven at low speed after the stitch three stitches before the last stitch in the pattern at the time it was pulled out. , when end data PED following the final stitch data is output, the sewing machine motor 42 is stopped at that point. As a result, even though the memory cassette 70 is pulled out during sewing, the pattern being sewn continues to be sewn until the pattern is completed, which may cause the pattern to become disordered, resulting in defective sewn products, or sewing tools such as presser feet. This completely eliminates the possibility of interference between the sewing needle and the sewing needle.

Further, according to this embodiment, the temporary storage memory 26 is
Since it has a relatively small capacity that allows only the stitch data SD for one pattern in a group of patterns, there is an advantage that there is no need to provide a special large capacity memory in the control circuit of the electronic sewing machine.

Furthermore, whether or not an individual pattern belonging to the combined pattern group belongs to the second pattern group is determined depending on whether or not the head address signal HA D stored in advance in the code memory 36 exists. There is an advantage that there is no need to provide any means.

Furthermore, the code memory 22 and intermediate memory 86 of the embodiment
Instead, it is simply a register that stores the IJ and rOJ signals in the order of combination, which indicates whether the combined pattern belongs to the pattern in the external memory 14, and a register that indicates whether the combined pattern belongs to the pattern in the external memory 14. Start address of pattern HA
A first code memory that stores D in the order of combination, and a second code memory that stores the start addresses HAD of the patterns belonging to the internal memory 12 in the order of combination, are provided, and either one of the two code memories is stored according to the signal in the register. It is also possible to perform the pattern format by sequentially reading out the first address HAD from the beginning.

Further, instead of the limit switch 78, a circuit is provided in the memory cassette 70 to short-circuit or ground a specific terminal in the connector 7G, so that the cassette loading signal PS4 is generated by the short-circuit or grounding. It's okay.

The above-mentioned embodiment is merely one embodiment of the present invention, and various modifications may be made to the present invention without departing from the spirit thereof.

[Brief explanation of the drawing]

FIG. 1 is a diagram showing the basic configuration of an embodiment of the present invention. FIG. 2 is an external view of the sewing machine according to the embodiment shown in FIG. 1, and FIG. 3 is an enlarged sectional view showing a state in which a memory socket is installed in the embodiment. FIG. 4 is a block diagram showing the electrical configuration of the embodiment of FIG. 1. 5 to 7 are flowcharts for explaining the operation of the embodiment shown in FIG. 1. FIG. 5 is a flowchart for explaining the operation of the sewing machine motor in a stopped state, and FIG. 6 is a flowchart for explaining the operation of the sewing machine motor in a stopped state. FIG. 7 is for explaining the data temporary storage routine of FIG. 6 in detail. 10: Sewing machine frame 12: Internal memory 14: External memory 16 Two pattern combination means 18: Pattern selection means
20: Writing means 22: Code memory 24: Reading means 26 2. Temporary storage memory 28: Data transfer means 30: Memory selection means 36. 2. Memory attachment/detachment detection means 38: Stopping means

Claims (1)

[Claims] (1) an internal memory provided within the sewing machine frame and fixedly storing data regarding a first pattern group consisting of a plurality of predetermined patterns; and an internal memory that is removable from the sewing machine frame;
an external memory for fixedly storing data regarding a second pattern group consisting of a plurality of patterns different from the patterns in the first pattern group; and a pattern combination means for sequentially specifying and combining desired patterns in both the pattern groups; A sewing machine comprising a pattern selecting means for selecting each pattern among the plurality of combined patterns in accordance with the specified order during operation of the sewing machine, and forming a pattern by operating a stitch forming means in accordance with data regarding the selected pattern. , a temporary storage memory provided within the sewing machine frame and having a storage capacity capable of temporarily storing data regarding one pattern; and a code for storing a code signal indicating a pattern in the second pattern group. a memory; a writing means for writing a code signal of each pattern belonging to a second pattern group among the plurality of combined patterns into the code memory in accordance with the specified order; and a second pattern among the plurality of combined patterns. reading means for reading out each code signal from the code memory in accordance with the specified order in connection with completion of formation of each pattern belonging to the pattern group; data transfer means for transferring and storing data from the memory to the temporary storage memory; and one of the internal memory and the temporary storage memory as a memory for storing data to be supplied to the stitch forming means; memory selection means for selecting a pattern by determining whether or not the pattern selected by the pattern selection means belongs to the first pattern group; detection means for detecting that the external memory has been removed from the machine frame; and for automatically stopping operation of the sewing machine in connection with completion of reading all data in the temporary storage memory when removal of the external memory is detected. A sewing machine having a removable external memory including a stop means.