SU1641913A1 - Sewing machine with program control - Google Patents

Abstract

. The invention relates to sewing equipment for the manufacture of clothing, footwear, leather goods and other products of light industry. The purpose of the invention is to improve the accuracy of the stitch by taking into account the actual stitches. The device is equipped with sensors for deviating the needle from the plane of motion of the stitched parts and returning to the working position. The sensors are connected to a switch with a memory connected between the speed sensor of the main shaft and the clock input of the software control unit of the machine. In the latter, stitches are recorded only in the working position of the needle. 1 hp f-ly. 16 il.

Description

The invention relates to electronically controlled sewing machines, programmed to perform a given number of stitches in a seam and used for grinding parts in the manufacture of clothing, footwear, leather goods and other products of light industry.

The purpose of the invention is to increase productivity by performing auxiliary operations during the overrun of the main shaft.

Figure 1 shows the device; Fig. 2 is a kinematic diagram of a sewing machine; in fig. 3-6 - construction of the rotating part of the needle bar; Fig. 7 shows the construction of means for automatically changing the angle of inclination of the needle relative to the plane of movement of the workpiece with needle position sensors and driving means for changing the angle of inclination of the needle; on Fig - the same, the view from the working; Fig. 9 shows a second embodiment of the means for automatically changing the angle of the needle; in fig. 10 - scheme

a software control unit executed on logic elements; in fig. 11 is a diagram of a keypad; in fig. 12 is a microprocessor circuit for performing a software control unit; in fig. 13-table of the outputs of the actuator interface decoder; in fig. 14 is a sequence diagram of the operation of the machinery; in fig. 15 is a block diagram of the microprocessor-based program control unit; in fig. 16 - needle thread line at different angles of rotation of the main shaft of the sewing machine.

The software-controlled sewing machine contains a head 1, a software control block 2 and a friction drive 3 (Fig. 1).

Sewing head 1 contains the mechanisms of a needle, a shuttle, a needle thread and a transporting rail, kinematically connected to the main shaft 4 of the sewing machine, and also presser foot mechanisms with an individual drive 5 and meO 4

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A thread trimmer with an individual drive b, electrically connected to software control unit 2. On the main shaft 4 of the sewing head 1, a sensor 7 of the revolutions of the main shaft is mounted, which represents an optical photodiode photodiode divided by an opaque disc with a cutout corresponding to the angle of rotation of the main shaft 4 from 300 to 60 ° mounted on the main shaft 4 (0 ° take the highest needle position). The sensor 7 of the main shaft is connected to the software control unit 2.

The needle mechanism contains (FIG. 2) the needle-driver 8, kinematically connected by means of a crank mechanism to the main shaft 4. The lower part 9 of the needle bar 8 (FIG. 3) with the needle 10 fixed on it is a spring-loaded cam pivotally connected to needle bar 8. The lower part 9 of the needle bar (Figures 3-6) is fixed on the axis 11, which is a finger pressed into the needle bar 8, and can be rotated by an angle that eliminates the interaction of the needle 10 with the material and the shuttle. A spring 12 installed in the needle bar 8 ensures that the lower part 9 of the needle bar is fixed in the extreme positions. Between the upper and lower parts of the needle bar 8 there is an inclined stop 13, which provides one-sided rotation of the lower part 9 of the needle bar when the needle is tilted. A plate spring 14 is fixed on the lower part 9 of the needle bar (for the case of using means for automatically changing the angle of the needle, fig.9) or the driver 15 with a finger 16 (fig.5.6) for the means of changing the angle of the needle shown in fig. 7 and FIG. 8, which are fastened with screws.

The shuttle mechanism (FIG. 2) comprises a shuttle 17 mounted on a shuttle shaft 18, which is connected to a camshaft 20 by means of a pair of gears 19, which in turn is kinematically connected to the main shaft 4 by means of a gear belt 21 and gears 22. A camshaft 20 is mounted in bearings in the housing of the sewing head 1.

The mechanism of the nivitrite of the givatel is a hinged rod and contains the nitrite of the givatel 23, kinematically connected to the main shaft 4 by means of a crank-connecting rod mechanism, which informs the movement of the needle bar 8,

A transport mechanism comprising a conveyor rail 24 is kinematically connected to the main shaft 4 by means of eccentrics 25 and 26 mounted on the camshaft 20, connecting rods 27 and 28, connecting links kinematically connected with the lifting shaft and the prop shaft 29 of the conveyor rail.

The presser foot mechanism comprises a spring-loaded rod 30, on the end of which a presser foot 31 and a lever mechanism 32 are attached, kinematically connected with an individual drive 5 of the presser foot mechanism.

The thread trimmer contains a movable knife 33, which interacts with a fixed knife 34 during thread trimming, a copier 35 mounted on a camshaft 20, and a cam 36 mounted on one of the arms of the rocker arm 37 rotatably mounted at a certain angle defined by the profile copier 35, relative to axis 38. The second arm of the rocker arm 37 is spring-loaded by spring 39 and is fixed in its initial position by a latch 40, kinematically connected to the individual drive 6 of the thread trimming mechanism, which, in turn, is electrically and connected to the software control unit 2, to which the needle thread tension regulator 41 is also connected, which is associated with the need to relieve the tension of the needle thread during the cutting process.

The means for automatically changing the angle of inclination of the needle relative to the plane of movement of the workpiece after the specified number of stitches are made in the form of a lever mechanism (Fig.7 and 8) hinged on the sewing head 1. The lever mechanism is a double-arm lever 42, one of whose arms made in the form of a plug 43, spanning the finger 44. pressed into the rod 45, connected by a system of levers to the core 46, of an individual actuator 47 of the means for automatically changing the angle of inclination of the needle. The second arm of the lever 42 is also made in the form of a plug 48. along the inner surfaces of the shed of which the finger 16 of the driver 15, which covers the lower part 9 of the needle bar, can slide along the guides. The opening angle of the fork of the fork 48 is such that when the angle of the needle changes, sliding the finger 16 along the fork guide 49, and in the working position along the guide 50, fixes the needle 10 and the lower part 9 of the needle bar, respectively, or in the off state (t. that is, when the angle of inclination of the needle 10 relative to the plane of movement of the workpieces excludes

the interaction of the needle 10 with the shuttle 17 and the material), or in the working state (i.e., when this angle is 90 ° and the axis of the needle 10 and the needle bar 8 coincide). The lever mechanism is spring-loaded with a spring 51 to return the mechanism to its original state (i.e., to restore the angle of inclination of the needle to perform sewing).

In the embodiment shown in Fig. 9, the means for automatically changing the angle of the needle after the predetermined number of stitches have been completed, an individual drive of the means for changing the angle of the needle is mounted on the sewing head 1 to the right of the worker, under the sleeve of the sewing head 10. At the same time, the needle 10 has the lower part of the needle bar 9 deviate to the left of the worker (as opposed to the embodiment shown in FIGS. 7 and 8 of the means for automatically changing the angle of inclination of the needle, in which the needle is deflected by the worker). The rod 45 is connected to the bark of the individual actuator 47 of the means for changing the angle of inclination, similarly to the version shown in FIGS. 7 and 8. The double-arm lever 42 attached to the sewing head 1 on the axis 52 has a roller 54 on the shoulder 53, which interacts with the lower part 9 needles for restoring the angle of inclination of the needle 10 relative to the material up to 90 °. The fixing of the lower part 9 of the needle bar is provided only with the help of a spring 12 (FIGS. 3 and 4). The return of the lever mechanism to its original state is also carried out by means of a spring 51.

Individual drives of the actuators 5 of the presser foot 6, the thread trimming mechanism, the drive 47 of the means for changing the angle of inclination of the needle 41, the tension adjuster of the needle thread, and the drive 55 for raising the pedal 56 for controlling the friction drive 4 (Fig. 1) are of the electromagnetic type.

3-type friction electric drive widely used on non-automated sewing machines. The operator controls the drive using the pedal 56. The pedal 56 is kinematically connected with the lever 57, which moves along the axis of rotation of the drive shaft the driven disc of the friction clutch 58. The speed of rotation of the drive is determined by the slip of the slave and driving discs and, in turn, determines sew speed The amount of slippage is controlled by pressing the pedal 56. In order to reduce the impact loads in the needle bar 8 and its lower part 9 when the needle is tilted relative to the plane of movement of the parts to be machined, the pedal 56 is equipped with an individual drive 55 of its lift after the specified number of stitches has been performed and the very soon is reached5 stitching in the run-out area of the main shaft 4. The rotation from the drive shaft 3 to the main shaft 4 of the sewing machine is transmitted by means of a wedge-shaped belt 59.

0 The software control device of the sewing machine is made as follows (Fig. 10 and 11).

The sensor of the main shaft is connected to the input of the generator of 60 square-wave impulses from the photodiode of sensor 7 (to the illuminated sensor — the needle above the material — corresponds to signal 1 at the output of the former, to the darkened — needle in the material — signal O). Shaper output

0 60 is connected to one of the outputs of the AND circuit 61, the second input of this circuit is connected to the output of the RS flip-flop 62, to the R and S-inputs of which the needle deflection sensors 63 and 64 are connected (switching on and off the needle, respectively). The output of the circuit 61 is connected to the inputs of the circuits 65 and 67 of the counting channels of the worked stitches in the first bartack, the seam and the second bartack, which are formed by counters 68-70, inverters 71-73 and circuits I 65-67. The counting inputs of the counters 68-70 are connected to the outputs of the corresponding circuits And 65-67. The overflow outputs of the counters 68-70 are connected via inverters 71-73. With the second inputs of the circuits 65-67,

5 and the outputs of the counters 68 and 69 are connected to the inputs of the circuits And 66 and 67, respectively. The outputs of the counters 68-70 are also connected to the inputs of the EXCLUSIVE OR circuit 74-76, the second inputs of which are connected to

0 exits of the RS flip-flops 77-79 for setting the tack, seam and second tack, respectively. The S-inputs of the trigger 77-79 are connected to the inputs. Record of the corresponding counters 68-70, and the R-inputs - with the outputs of the specified counters.

The outputs of the circuits EXCLUSIVE OR 74-76 connected to the inputs of the circuit And 77, the output of which is connected to the counting input of the counter 78 with a conversion factor of 4.

0 The overflow signal output of counter 78 is connected via inverter 79 to another input of the circuit 77.

For fixing the moment of possible switching on (disconnection) of the needle (for synchronization of synchronization with rotation of the main shaft to the required angle), the control device contains a driver of 80 single pulses, the input of which is connected to the main shaft transmitter 7, and the output to one of the inputs of the AND circuit 81, and trigger 82, whose S input

is connected to the output of the AND 81 circuit, and the R input is connected to the overflow output of the counter 78, the second input of the AND 81 circuit is connected to the output of the inverter 79.

The outputs of the flip-flops 77-79 and 82 and the outputs of the counter 78 are connected to the address inputs of the decoder 83, to the output lines of which DO-D5 actuators 5, 6, 41, 47 and 55 are connected to the actuators. One of the channels of the decoder 83 - TO is reserved for controlling the drive of the actuating mechanism for performing the tack (not shown).

To another input circuit And 77 connected to the output of the clock pulse generator (GTI) (not shown).

Figure 11 is a diagram of a keyboard console, also made on discrete elements and providing the ability to set the required number of stitches in bartacks and stitches using the set of number stitches (units and tens) keys 85 and 86, or according to a predetermined program. Keys 85 and 86 sets of stitch numbers are connected to the inputs of the decoders 87 and 88, respectively, and the inputs of the OR schemes 89 and 90. The outputs of the decoders 87 and 88 are connected to the inputs of the buffer registers 91 and 92, and the inputs to the Records of these registers are connected to the outputs of the OR schemes 89 and 90. The purpose of the registers - etc interim storage of codes of units and tens of stitches, patterns OR — formation of signals Writing into these registers when the button is pressed the required number of stitches.

The outputs of the registers 81 and 82 through the decoder 83 is connected to the inputs of the preset counters 68-70 (Fig. 10). The write signal to the counter is formed by the corresponding patterns when the desired key is pressed: recording the number of stitches in the first bar - key 84, seam -. 85, to the second bar - key 86. The signals from these keys are formed by the circuits 87-89, respectively. The Reset 90 key and the corresponding driver 91 form a reset signal, clearing the counters and registers. The results of stitches dialing through decoders 92 and 93, connected by inputs to outputs of buffer registers 81 and 82, and outputs to indicator 94, are displayed on a seven-segment display 94.

The switch with contacts 95-98 allows you to select the desired mode of operation: according to a predetermined program or according to a program set from the console (you can set the number of stitches in bartacks and seam manually, from the console). The ability to work on a given program is provided for

the connection account to the inputs of counters 68-70 of the output of the decoder 99 with the program recorded in it (the number of stitches in bartacks and seam). The address inputs of the decoder 99 are connected to the outputs of the counter 100, the counting input of which is connected to the output of the circuit 101, whose inputs are connected to the output of the clock pulse generator (not shown) and the output of the inverter 102. The input of the latter is connected to the overflow output of the counter 100.

In the microprocessor version, the software control device 2 (FIG. 12) comprises a processor 103,

5 a random access memory (RAM) 104, a persistent storage device (ROM) 105, a power source (not shown), a control panel 106, and the interface 107 of sensors and actuators.

0 mechanisms. Data, addresses and control commands are exchanged on an internal bus 108 containing an eight-bit data bus (D-D7), a sixteen-bit address bus (SHAA-A15) and

5 control bus (SHU),

The processor 103 consists of large integrated circuits (LSI) of the four types of the KP580 family: one LSI of the KP580IK80A type; BIS system generator

0 type KR580GF24; two eight-bit tire formers of type KR580VA85; universal bidirectional bus data generator, united on one LIS with the status register and formation system; control signals such as KR580VG28.

Executive memory consists of 2K bytes of RAM 104 on two integrated circuits of K565RU2x8 type chips and a ROM

0 39 of 4K bytes on four chips like K573RF1. The RAM stores the data and intermediate results during the execution of the line program, and the line program is stored in the ROM.

5 (main program), containing commands defining the work of various actuators, counting the number of stitches in the fastener, seam, etc.

The power supply provides the supply voltage required for the operation of the firmware control device: + 5V, -5V, + 12V and the supply voltage of the individual actuators of the actuators + 24V.

5 The keypad 106 is implemented as a 5x5 matrix of contacts with an interface based on three K589IR12 chips for program exchange and data entry (the number of bar tacks, the number of stitches in the seam, etc.). Data entry results as well

The necessary messages on the progress of the main program are displayed on the alphanumeric indicator built into the console 106, assembled from several indicator indicators (for example, of the type AL C 324).

The device works as follows.

Preliminary, by entering the preset, the codes for the number of stitches in the first bar tack (to counter 69), to the seam (to counter 69) and to the second bar (to counter 70) are entered. The number of stitches in the counters is recorded by the Record signal generated by the control panel scheme (Fig. 11). Further, the work is carried out in accordance with the sequence diagram shown in FIG. 14.

Consider the job when setting the number of stitches from the console. When the control unit is turned on, the initial reset circuit (not shown) zeroes all the counters, registers, and sets all triggers to O. In this case, the output of the decoder 83 will be a combination of signals shown in row 1 of the table (Fig. 13). The presser foot 31 is raised, the pedal 56 of the friction drive 3 is blocked, the needle thread tension regulator 41 is loosened for easy refueling. It is assumed that the needle 10 is also disconnected, i.e. the drive 47 of the means for changing the needle tilt angle is turned on. The needle shut-off sensor 64 of the trigger state 62 does not change after reset. At its output is a signal O, which prohibits the passage of pulses from the sensor 7 of the main shaft to the input of counters 68-70 before turning on the needle. At the outputs of counters 68-70 - O, at the outputs of circuits 74-76 - 1, however, the pulses to the input of counter 78 from the GTI do not pass, since the launch of the GTI is done with a delay sufficient to set the number of stitches (the simplest constructive solution in this In the case of - a GTI to perform as a pair of photodiode - a LED located on the main shaft 4).

Pressing any of the keys 85 and 86 to specify the number of stitches at the output of the decoder 87 or 88, the key pressed appears and is written to the buffer register 81 or 82 by the signal generated by the OR circuit 89 or 90. Simultaneously through the decoder 92 or 93 stitches are displayed on the indicator 94. If you press the key incorrectly, which the operator can judge by the indicator 94, pressing the Reset key 90 clears the registers. The accumulated number of stitches is recorded in the counters by pressing the required key (Clip 84, Seam 85, or Clip 2 - 86.

Writing the code of the number of stitches in the counters 68-70 causes a change in the state of 1 outputs of the flip-flops 77-79 connected to the inputs of the counters in which the code 5 of the number of stitches is written, which leads to the appearance at the outputs of the corresponding schemes EXCLUSIVE-. THINNING OR 74-76 signals O, which block the passage of pulses from the GTI to the input of counter 78. At the same time, changes the state of the input lines of the decoder 83 (rows 2-4 of the table in Fig. 13), which causes a change in the signals on the output lines a decoder 83 and, accordingly, a change in the state of actuators of executive mechanisms.

Pressing the pedal 56 of the friction motor starts sewing. At the same time on the 0-stitch command is issued to turn on the drive 47 means of change

0 the angle of the needle (line 5 of the table in Fig. 13). The shutdown command is given at the moment of movement of the main shaft 4 when turning through an angle of 300-360 °, due to the fact that at the time of turning the main shaft 4 through an angle

5 300 ° shaper 80 generates a pulse, which resets the trigger 82 to 1 (at the output p of the counter 78 at this moment O at the output of the inverter 79-1, the pulse from the driver 80 can enter through the circuit

0 81 at the exit of the trigger 82).

Turning off the drive 47 of the means for changing the angle of inclination of the needle at 0-stitch triggers the sensor 63 and sets the trigger 62 to the state G, which, in its

5 queue, allows the passage of pulses of the sender 7 of the main shaft to the input of the counting circuit (circuits 65-67, etc.). These pulses simultaneously arrive at the inputs of all three specified circuits I. However, on

0 inputs of counters 69 and 70, they get only after the number of stitches in the first bartack has been worked out (to the input of counter 69, since the output of counter 68 is a signal 1 allowing the passage of pulses through an AND circuit 66) and after working the number of stitches in the seam - to the input of the counter 70. Moreover, after the corresponding number of stitches are worked out, the passage of pulses to the counter

0 is blocked by its own overflow signal, applied through circuits 71-73 to the input of circuits 65-67.

The testing of the required number of stitches in the buckles and the seam causes the appearance of signals 1 at the outputs of the schemes EXCLUSIVE OR 74-76. After all the stitches, pulses from the GTI, hit the input of the counter 78, are processed, the state of its outputs and, accordingly, the address inputs of the decoder 83 are changed. The signal changes to

the output of the decoder 83 is displayed in the table in Fig.13. Simultaneously with the counter overflow trigger. 82 is reset to 0, preparing for the next cycle, and triggering the needle shut-off sensor 64 blocks the passage of pulses from the main shaft sensor 7 to the input of counters 68-70 for counting the number of stitches. It is possible to use a time relay, the start of which can be carried out on one of the outputs of the decoder 83 after working out the required operations (the relay and the additional output of the decoder are not shown). At the end of the shutter speed specified by the relay, a reset circuit is started, which brings the control unit to its initial position.

When pressing the Remote / Program switch, the corresponding pins 95-98 disconnect from the inputs of counters 68-70 the outputs of the buffer registers 81 and 82 and connect to them the output of the decoder 99, which contains all the necessary information about the number of stitches in bartacks and seam, including the write signals in counters. The change of addresses at the input of the decoder 99 is made from the GTI via the counter 100. After the full reference frame of the required combinations, the passage of pulses from the GTI is blocked by the overflow signal of the counter 100.

In the variant of microprocessor control, the device operates as follows (Fig. 12).

An operator (not shown) turns on the power source and puts the machine on standby. The program stored in ROM 105 requires data entry on the number of stitches in the seam (Sc) and the number of bar stitches (Scch), which is provided by the operator by entering the required data from the keypad 106 (block 1 in the flowchart, FIG. . 15). After installing the parts for the needle 10, lowering the presser foot 31 and pressing the pedal 56 of the friction drive, the machine starts to execute the line according to a predetermined program — branch 16-22 of the flowchart of the algorithm (FIG. 15), if the first tack data is missing and the branch 8-22, if the first bar data is entered by the operator.

In the process of working out the program line, the operation of the control device is organized by means of control signals generated by the processor 103: FOD — data is written to the RAM 104; ZVPP - writing data to input / output devices; ChTP - reading data from RAM 104; ChTVV - reading the data of their input-output ports. The external devices for processor 103 are sensors and individual drives.

actuators connected to the corresponding PC4-PC7 input-output port (input) and RSO-RSZ (output) ports.

Program exchange is carried out by

microprocessor 103 in accordance with the program.

Data input from external devices is made by the ready signals, i.e. just as the external device occupies the initial state and is ready to execute the command. To implement software exchange, interface 107 contains data input and output ports and control ports. Port

5, the control contains a register for storing the status word of external devices and logic for sampling and control (not shown). When entering data, the latter is written to the port.

0 is input by the data readiness signal, and the readiness state of external devices in the control port is set. The processor 103 reads the state of the control port from the data bus, setting it to

5 address to the address bus on the control signal ChTVV. Similarly, data is read from the data entry port. When the data is finished reading, the readiness state of the external devices of the control port is determined by the 0 End of read signal.

During data output, data reception is confirmed by a data acknowledgment strobe. Data is received, by which the readiness state is set.

5 external devices in the control port (for example, the signal from the sensor 64 is a signal confirming the reception of a control signal for changing the angle of inclination of the needle 10 means for automatic

0 change the angle of the needle). The processor writes the data to the output port 103 according to the signal of the SCRF. At the end of the recording, the readiness state at the control port is reset by the End of Read signal.

5 Thus, the microprocessor control device performs flexible control of the actuators depending on the state of the sensors and actuators in

0 specific point in time. The number of stitches worked out is monitored using the main shaft sensor 7 (section 6-10 of the program bar for the bartack and section 12-16 for the straight stitch,

5 of FIG. 15).

During the process of stitching a stitch with a given number of stitches, the electronically controlled sewing machine works just like a regular sewing machine, with the only difference that the number of stitches is continuously monitored and compared with the given stitch. When the specified number of stitches and the waste stitch coincides, the processor 103 outputs to the output port and through it to the interface 107 of sensors and actuators, the command to turn on individual drives: 55 - raising the drive control pedal 3; 6 - mechanism for trimming threads of the needle thread tension regulator 41; 5 — raising the presser foot; and 47 — individual driving means for automatically changing the angle of inclination of the needle 10 relative to the plane of movement of the workpieces. In this case, the threads are cut as the yoke 37 is released from the latch 40 and the cam 36 hits the working section of the profile of the copier 35, which causes the movable knife 33 to move, interact with the threads and the fixed knife 34, and trim the threads. At the same time the actuation of the individual drive 5 of the presser foot mechanism 31 leads to the lifting of the latter. At the same time, the parts being stitched stop as the kinematic closure of the chain of the transport rail - material - presser foot is broken.

The actuation of the individual actuator 47 of the means for automatically changing the angle of inclination of the needle causes the lever mechanism to rotate about its axis counterclockwise (Fig. 7). In this case, the finger 16 falls on the guide 49 of the plug 48, which assumes a vertical position, which prevents the lower part 9 of the needle bar from returning to the vertical position (in Fig. 7, this position is indicated by a dotted line).

Changing the angle of the needle 10 relative to the plane of movement of the workpiece is possible when the needle 10 is above the material when the main shaft 4 is rotated through an angle of 270-360 °. After changing the angle of inclination of the needle 10, what happens in the range of rotation of the main shaft 4 at an angle of 300-60 ° on (+2) st stitch, following after working out a given number (11), since 30 ° of the angle of rotation of the main shaft 4 is required for additional raising of the tip of the needle 10 to the lifting height and thickness of the sole of the presser foot 31 and cutting, the cycle of which for the given trimming mechanism takes the angle of rotation of the main shaft from 320-60 ° stitches 0 + 1) and (i + 2), the main shaft 4 by inertia makes several turns. The number of the latter depends on the speed of sewing at the final stage before disconnecting the drive 3 from the main shaft 4 of the machine,

After changing the angle of inclination, the needle 10 makes damped oscillations above the material and does not interact with the lower loop-forming body (shuttle 13), which makes it possible to remove and install the parts under the needle 10. Cutting threads, raising the presser foot 31, removing and installing parts under the needle 10 are thus made in the overrun area of the main shaft 4. The specific sequence of performing the auxiliary operations — trimming, raising the presser foot 31, turning off (changing the angle of the needle) —determined by the type of trimming mechanism, for example p, using the specified mechanism, such a sequence is necessary (Fig. 15): piercing the needle with a needle, wiring the thread into the material, grabbing and bypassing the expanded loop-inlet with the shuttle 17 and the interaction of the movable knife 33 with the threads only after the expanded loop is dropped from the nose of the shuttle 17 Thus, for cutting, this mechanism requires one more stitch — a single, and the trimming on the second stitch is completed after the specified number of stitches,

In any case, all auxiliary operations are performed after the main shaft 4 of the sewing head is disconnected from the shaft of the friction drive 3. For individual operation, the individual drive 55 of the drive control pedal lift 3 simultaneously with the predetermined number of stitches is pulled up the pedal 56, ensuring that the main shaft 4 is timely detached from drive 3 (at the command of the control unit).

The timing and synchronism of the actuator 47 with the rotation of the main shaft 4 is ensured by the fact that the notches in the opaque disk of the sensor 7 of the main shaft and its installation on the main shaft 4 are made so that the signal from the sensor 7 comes when the main shaft 4 rotates through an angle of 300-60 °

The recovery of the angle of inclination of the needle 10 occurs on the first stitch by the command of the control device. In this case, the lever 42 rotates clockwise and returns the lower part 9 of the needle bar to its original state. This is accomplished by raising the needle 10 in the range of the rotation angle of the main shaft 4 300-360 ° with the individual drive 47 turned off under the action of the spring 51. Moreover, the signal of the microprocessor device 2 is supplied at the time of rotation of the main shaft 4 at an angle of 300 ° so that by the time the needle reaches 10 extreme

The upper position (360 °) of the axis of the needle 10 and the needle bar 8 coincided.

In the case of means for automatically changing the angle of inclination of the needle according to the variant shown in FIG. 9, the temporary operating parameters of the sewing machine are maintained, but the change in the angle of inclination of the needle 10 occurs when it rises from 300 to 360 ° of the angle of rotation of the main shaft 4. the angle of inclination of the needle 10 occurs due to the fact that the spring 51 interacts with the rod 45 pushed down by the command of the microprocessor control device 2. The needle driver 8 hits the spring 14 on it and rotates the lower part 9 of the needle bar clockwise by an angle, and switching interaction of the needle with the material and the shuttle 17. When the angle of inclination is restored, the actuator 47 is de-energized. Under the action of the spring 51, the rod 45 and the lever 42 associated with it return to their initial state (turn counter-clockwise), and the lower part 9 of the needle bar rises up on the roller 53 and extends upwards, when the needle axis 8 is raised. 10 and needle bar 8 match ...

The needle thread pattern (Fig. 16) for the initial ABCDEG contour changes during the movement of the eye of the nitrite - eyelet 23, thread guide and needle 10 of the needle during material movement on each stitch at characteristic moments a, b, c, d, st of the stitch formation process . When the angle of inclination of the needle 10 varies with respect to the plane of movement of the parts being machined, the path of the needle thread changes. Fig. 16e shows the change in the needle thread path for the case when the needle 10 is deflected to the left, and in figLbzh to the right of the worker. Deviation of the needle thread path from the usual at the moment the needle 10 leaves the material i improves the actual thread consumption pattern, bringing it closer to the ideal for the moment of sampling the shuttle kit, and improves the conditions for trimming it as a result of creating additional tension due to the needle eye deflection.

The advantages of the proposed electronically controlled sewing machine are that changing the needle angle relative to the plane of movement of the workpieces after the specified number of stitches has been completed can increase the productivity and utilization rate of the sewing machine by overlapping the time of the working strokes of the machine and the time for performing auxiliary operations on the run of the main shaft of the sewing machine.

Claims (2)

1. Sewing machine with software control, containing a sewing head, needle mechanisms with needle bar, shuttle, nitript givatel and transporting rail, kinematically connected with the main shaft of the machine, the sensor speed of the main the shaft and the software control unit, the outputs of which are connected to the drives of the presser foot mechanisms, trimming threads and deviating the sewing needle after performing a specified number of stitches, is different from the fact that, in order to increase productivity by performing auxiliary operations during the overrun of the main shaft, it is equipped with sensors of extreme positions of the needle, trigger and logic element I, and the mechanism for deviating the sewing needle consists of a double-arm hinged to the sewing head, the shoulders of which are made in ideal forks, and kinematically associated with drive mechanism for deviation of the sewing needle of the rod with a finger fixed on it, placed in the throat of one of the forks of the two shoulders of the lever, the lower part of the needle bar is designed as a hinge connected to the upper part of the spring-loaded cam with a needle fixed in it, equipped with a means of fixing the needle in the working and disconnected positions and located in the throat of another fork two shoulders of the lever, while the sensors of the extreme positions of the needle are connected to the corresponding trigger inputs, the output of which is connected to the first input of the logical element AND connected to the second the input with the main shaft speed sensor, and the output with the clocking input of the program control unit. 2. The machine according to claim 1, characterized in that the means for fixing the needle in the worker and the disconnected positions are made in the form of a leash fixed to the cam needle, equipped with a finger mounted with the possibility of alternating interaction with the inner surfaces of the teeth of the fork. 6 39 (Rig.1 FI.3 FIG 5 at 12 f / Fy sixteen FIG. 6 FIG. 7 47 - 57. 8 9 Zl (t) Private ririnl f-im-ihLjULJ i w Cl6lt 9l SSMOtSdit SHO Lir (a i U 2Pf No J J & l wo gvl 18 - IS i S8 fig 0 fig.M Not Not / V sixteen g Poll port of entry W Not {SssSsh - Ct / Cg / - 1 nineteen / La SbtdambSflOflffiSb / Sodp code 8k / night / a / in (lrЈ (yes55 (No.d 25 .6 F issued blobbododayuyutyu- vewx / ipi / fffdoSfffeffpejMli / 5- (pressing / Yulka) and M &. Poll entry desk issue a $ flpt / baud 47 & g) code - S 13 em -sign / G AGV-F 12 0npoc lor / paSSoda, Not / l Sigm - JT 10 CyC3 - C4Cj-f { 0npoc port SSoda Not Not / h 29 Polling input lorth Not 21 (Os / Panov} Fig.15 FIG. sixteen