JPS5912310B2 - Electronic sewing machine pattern generator - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a stitch pattern generation device for a sewing machine, and an object thereof is to store stitch control signals for forming a stitch pattern in advance in an electronic main memory 20. The memory is fixedly stored in the device, and the memory consists of multiple words for the same address. 25 words are used to determine whether to use both needle runout and/or fabric feed, and the auxiliary memory stores the information for each stitch that is required for a stitch in a pattern that uses either of the two. This is intended to store stitch control signals common to all stitches and utilize the stored contents of the main storage device as more stitch information.

3(), In conventional electronic sewing machines that store stitch control signals in an electronic storage device and generate stitch patterns, all stitch control signals constituting each pattern are stored as a set for each pattern. Therefore, even if the fabric feed amount is constant across all stitches of a certain pattern, it is necessary to store the fabric feed signal in pairs with each needle lateral runout signal in the 35th stitch mother. This has the disadvantage that the storage space increases accordingly and the sewing machine cannot be made smaller.

The present invention was devised to eliminate waste as much as possible and use stored data more effectively, and an embodiment thereof will be explained with reference to the accompanying drawings. Fig. 1 is a schematic diagram of a sewing machine equipped with the device of the present invention. In the figure, 1 is a sewing machine frame, and 2 is an upper shaft which is driven by a sewing machine drive motor (not shown) and moves a needle 4 up and down via a needle bar 3.

PG is a synchronous pulse generator, which consists of a photointerrupter 5 fixed to the sewing machine body 1 and a light shielding plate 6 fixed to the upper shaft 2.
Each time the upper shaft 2 rotates, the needle 4 generates a high level 5 pulse in a predetermined phase section above the needle plate (not shown), and generates a low CL, ) level in a predetermined phase section below. I'm starting to do that. SW1 to SW are pattern selection switches, 7 is a control device, and MB is a pulse motor for controlling needle lateral runout.
This gives the needle lateral movement as a directional control. MF is a pulse zeta for controlling the cloth feed, and rotation of the motor is controlled by link 9, feed adjuster 10, bifurcated rod 11, and connecting link 1.
2. Control the horizontal feed movement of the feed dog 14 via the horizontal feed shaft 13 as a second directional control. 15 is the lower axis and upper axis 2
The thread ring capture device (not shown) is rotated in synchronization with the thread ring capture device (not shown).

FIG. 2 is a control circuit diagram showing a first embodiment of the present invention, the main part of which is housed in the control device 7 of FIG.

One end of each of the pattern selection switches SWl to SW is grounded,
Each other end is connected to the control power supply +V via the pull-up resistor R-R.
cc and each input side 1 of encoder ENCD
N, and the 3-bit output side 0UT of the encoder
is an input to the address storage device ROMA via the latch circuit L1. The latch circuit L1 receives the output of the monostable circuit MM at the trigger terminal CP, and the monostable circuit M
The trigger terminal CP of M is connected to the output side of the NAND circuit NA which becomes H level when any of the switches SW, .about.SW, is operated. The address storage device ROMA stores a starting stitch number (starting address) unique to the selected pattern for a counter C for counting stitch numbers that indicate the stitches of all the patterns enabled by this control circuit. ) is specified using 7 bits, and the designation of each pattern is based on the 3-bit output signal of the latch circuit L1, which is determined by operating any one of the switches SW1 to SW8. The instruction for the counter C to accept the leading address is due to the fact that the load terminal L receives the output of the monostable circuit MM via the 0R circuit 0R1.
The count up of the counter is performed by counting the H-level signal generated every rotation of the upper shaft 2 of the front signal generator PG connected to the terminal UP, and by storing the stitch signal. A 7-bit address signal is given to the main memory ROMM. The main memory stores each 5-bit signal used for needle lateral runout control and/or cloth feed control at each stitch of the sewing pattern, and each output terminal group X, Y is connected to the first discriminator SEL1. It is connected to the.
Each terminal of the output terminal group
1 to the load terminal L of the counter C. The output terminal group Y is also connected to a second discriminator SEL. ROMs are auxiliary storage devices, main storage device ROM
For a pattern that uses only one of terminal groups X and Y of M, a 5-bit cloth feed control signal Ys common to that pattern
, a straight stitch signal ST specifying straight stitch, and a 2-bit signal
and is output according to an address based on a signal from latch circuit L1. The first discrimination circuit SELl
5 sets of AND-0R circuits AN representing one of them
D-0R1, one A of each AND-0R circuit
receives as an ND input one signal of the terminal group The output of the 0R circuit constitutes each bit of the pulse motor drive device DVB for controlling needle lateral runout.
Similarly, the second discrimination circuit SEL consists of five sets of AND-0R circuits (AND-0R2), one of which is representative, and has a similar configuration for the signals of the terminal group Y and the y signal. The 0R output constitutes each bit of the cloth feed control pulse motor drive device DVF. Pulse motors MB and MF for controlling needle lateral runout and cloth feeding are driven by respective drive devices DVB and DVF. and a drive device DV for cloth feed control.
F- receives a signal from a pulse generator PG, and drives a pulse motor MF every time the upper shaft 2 receives an L level signal generated every revolution. Figure 3 is the second
Each stitch pattern P can be sewn using the control circuit shown in the figure.
1 to P8, and the data shown in Table 1 is stored in the main storage device ROMM to form these patterns.

In Table 1, C indicates the count value of counter C in hexadecimal notation, and serves as an address signal for the main memory device ROMM. X and Y are hexadecimal data stored in the storage device ROMM, each stored in correspondence with the address signal, and output to terminal groups X and Y of the storage device, respectively. Ru. Of the X data, each bit of the data indicated by 1F is 111.
11, and when this data is read, the counter C is reset via the AND circuit AND, OR circuit 0R, and the start address for repeating the pattern is immediately obtained without forming the pattern according to the code. This is to try to move to . P1 to P8 outside the column indicate that the column corresponds to the start address of each pattern P1 to P8 (the same applies to Table 4 below). The auxiliary storage device ROMs stores data ST, x, y, YS shown in Table 2 for each code of the latch circuit L1 corresponding to the patterns P1 to P8 selected by the switches SW and SW8. When the straight stitch signal ST has a logical value of 1, the needle lateral runout control drive device DVB is controlled to the needle lateral runout center position. In other words, straight stitching is specified. The signal x has a logic value of 1 or O, and the first discriminator SEL1 discriminates between the signal x and Y, respectively, and drives the needle lateral runout control drive device D.
Enable it for VB. Similarly, the signal y is 1 or 0, and the second discriminator SEL2 discriminates between the signal Y and the signal Ys, respectively, and the cloth feed control drive device D
Enable for VF. The signal Ys is a cloth feed control signal common to the pattern as described above. Blank columns in Table 2 or in other tables are not used in this example. Fig. 4 P1 to P8 show the stitch coordinates of the pattern shown in Fig. 3 in more detail. For example, the right maximum R of the needle lateral runout is expressed as 01, and the center M is 15.
, the left maximum L is 30, and the codes 0, 0F, and 1F of x or Y in Table 1 respectively mean these.

As for the cloth feed amount, as shown in P1 of Fig. 4, the maximum rear feed is -15, no feed is 0, and the maximum forward feed is +15. 0F and 1E make this clear. The numbers in the figure are stitch numbers indicating the needle penetration points of the cloth in order, and 1 indicates the first stitch number of the next pattern. Table 3 is a comparison table of the stitch numbers and each coordinate code of P8 in FIG. 4. In the configuration mainly shown in Figure 2 above,
To explain its operation, for example, when the pattern selection switch SW8 is operated to select the pattern P shown in FIG. ,0,12.

Therefore, from now on, the first discriminator SEL1 uses the needle lateral runout control drive D.
The second discriminator SEL2 makes the data Y of the main memory ROMM valid for VB, and the second discriminator SEL2 makes the data Ys of the auxiliary memory ROMs valid for the cloth feed control drive device DVF. This data YS is 1 in common for each stitch of pattern P8.
It is 12 in hexadecimal. Address memory device ROMA receives the code from switch SW8, and main memory device ROMM
In order to read the start address corresponding to pattern P8, code 2B, which is written in hexadecimal notation in Table 1, is given to counter C. At this time, the monostable circuit MM emits a signal by operating the switch SW8, so the counter C receives the signal at the load terminal L and is loaded with code 2B. (main memory ROMMO whose address is the code)
The Y data is 00 in hexadecimal as shown in Table 1, that is, the coordinate is 0, and the needle lateral runout control pulse motor MB controls the needle 4 to the first stitch coordinate 0. When the sewing machine rotates to form the first stitch and reaches the first needle bottom dead center, the pulse generator PG generates an L-level pulse to drive the fabric feeder leg drive device DVF to move the fabric to 16 The feed adjuster 10 is turned on to obtain the feed amount of 12 in decimal notation, that is, the feed amount +3. Then, when the sewing machine continues to rotate and reaches the first needle top dead center, the pulse generator PG
generates an H level pulse, counter C counts up, and address data C in Table 1 becomes 2C. After the feed +3 is performed, a stitch with a needle lateral runout coordinate of 10 is formed as the second stitch in the same manner as described above. Thereafter, stitches are formed in the same way, and after forming the last stitch, when the counter C becomes 3D in hexadecimal, the 5-bit code X is 11111, the AND circuit ANDl becomes 1, and the counter C controls to load the data of the address storage device ROMA and read out the first stitch control signal;
As a result, the pattern is formed repeatedly. FIG. 5 is a control circuit diagram showing a second embodiment of the present invention. Parts common to those in FIG. 2 are indicated by the same symbols, and only different parts will be explained. As shown in Table 4, for the address signal L output from the latch circuit L or L1, in addition to the same data r and Y' as in FIG. Signal A is memorized.

That is, the signal A is intended to specify, for example, that when the main memory device ROM'M is first read at address 00, the next read is to be performed at address 08, and the 6-bit signal A is sent via the latch circuit LL2. Of these, 3 bits are connected to address terminal group B via 0R circuits 0R, 0R, 0R4. Each of the 3-bit outputs of the latch circuit L1 similar to that shown in FIG.
2, AND, , AND4 and the 0R circuit 0R2, 0R,
, 0R4 are connected to the address terminal group B of the main memory device ROMM, and together with the data via the latch circuit L2, the latch circuit L2 receives the signal from the monostable circuit MM. The signal A is received at the set terminal R, and the signal A is latched by the high level signal (pulse generator PGO).
-$5 is operated, the 3-bit code 000-111 formed by each operation specifies one of the addresses 00-07 in Table 4 when the switch is operated. And this implementation progress. Of the data of T, data with addresses L of 01, 02, 09 to 0C are commonly used for the two patterns. Note that the main memory device ROM'M does not provide the reset signal 11111 to be output to the terminal X'. Note that FIGS. 1, 3, 4, J tables 2 and 3 are used in the second embodiment shown in FIG. 5 in the same manner as in FIG. 2. To explain the operation of the configuration mainly shown in FIG. 5, for example, when the pattern selection switch SW8 is operated to select pattern P in FIG. Data Y' in the main storage device ROMM is made valid for the control drive device DVB, and data Y8 in the auxiliary storage device ROMs is made valid for the cloth feed control drive device DVp.

The operation of switch SW8 causes the monostable circuit MM to send a signal to reset the latch circuit L2, and also stores a 3-bit code in the main memory via AND circuits AND2, AND3, AND, and 0R circuits 0R2, 0R, 0R4. Device ROM
07 shown in hexadecimal in Table 4 is given to M as an address signal. Y' data corresponding to the address signal is 16
The base number is 00, that is, the first stitch coordinate is 0, and the signal A
At 22, the pulse generator PG(7) H level signal generated as the upper shaft 2 of the sewing machine rotates specifies the address 22 for reading out the second stitch control signal. The Y' data of the address is the needle lateral runout coordinate of 10, and the feed amount common to these is +3, so that a pattern P8 is formed in the same manner as in FIG. The signal A is 07 for the address signal 06 for forming the last stitch, and the weave pattern is repeatedly formed. The combination of FIG. 5 and Tables 2 and 4 shows the output signal of the main memory device ROM'M, each of 5 bits
' and Y', but if you add sewing data for the same purpose to the same address, for example, as 5-bit Z', the address signal can be made common to these, so it can be used for just one amount of pattern information. Thus, the address signal L and signal A in Table 4 can be saved.

As described above, according to the present invention, the stitch FIL leg signal common to each stitch of a selected pattern is stored as one piece of data in a separately provided auxiliary storage device, without being repeatedly stored in the main storage device. It is possible to save storage space in the main storage device by distinguishing and using it according to the pattern, and its configuration can be made relatively easily! This is an invention that is industrially and practically effective.

[Brief explanation of the drawing]

FIG. 1 is a schematic diagram of a sewing machine equipped with the device of the present invention, FIGS. 2 and 5 are control circuit diagrams showing first and second embodiments of the present invention, and FIG. An example of a stitch pattern that can be implemented using the control circuit shown in FIG. 5, and FIG. 4 is a detailed diagram thereof. In the figure, MB and MF are electromechanical converters, ROMM, ROM'
M is the main memory, ROM8 is the auxiliary memory, SWl~S
VV8 is the main element of the pattern selection device, SELl,,SE
L2 is a discriminator.

Claims (1)

[Claims] 1. In a sewing machine equipped with a pattern forming device that forms stitches by controlling the relative position of the cloth and the needle in a first direction and a second direction using an electromechanical transducer, As stitch control signals for each of a plurality of stitch patterns, a plurality of pieces of stitch control data are stored for one address, and each piece of the data is set in the first direction or the second direction. A main storage device that enables control of any one of the patterns, and a main storage device that is operated to select a desired pattern, specifies the desired pattern to the main storage device, and stores data at the beginning of the pattern for the plurality of pieces of data. a pattern selection device that outputs
Common data for stitch control that is common to each stitch constituting one pattern in an electronic storage device and for controlling one of the first direction and the second direction, and the common data; each of the data in the main storage device in one of the first direction and the second direction, and the common data in the other direction or two of the data in the main storage device.
an auxiliary storage device that stores discrimination data for specifying that a set of pieces is to be controlled in both directions, and to which the discrimination data is specified by the pattern selection device; and a discriminator for controlling the pattern forming device by making each stitch control data in the main storage device or the auxiliary storage device correspond to the first direction and the second direction, respectively. A pattern generator for electronic sewing machines.