JPS609836B2 - Sewing machine processing cloth guide device - Google Patents

Description

[Detailed description of the invention] This invention relates to a sewing machine cloth guide device.

Conventional work cloth guide devices of this type have three guide plates spaced apart vertically on the work cloth support surface on the cloth feed side of the cloth feed device in order to store two sheets of work cloth separately. At the same time, a guide body is provided for guiding the green of the work cloth introduced between the guide plates, and a guide body is provided between the upper guide plate and the intermediate guide plate, and between the intermediate guide plate and the lower guide plate. A pair of pressing pieces are disposed between the two guide plates, and the two pieces of work cloth introduced between the three guide plates are rotated when the work cloth is transferred by the cloth feeding device. A work cloth guiding device is provided which provides motion and always guides the green of the work cloth along the guide body to the needle drop point to form a seam along the edge of the work cloth. However, in the workpiece cloth guiding device of this conventional structure, there is a thick stepped part "made by folding back darts etc." in the sewing part of the workpiece cloth.
Or, depending on the item being sewn, if there is a step that occurs when one piece of work cloth is joined to another piece of work cloth from the middle, the step may get caught on the guide plate when passing between the guide plates during sewing. , it may get caught on the pressure piece.

The present invention has been made in order to solve the above-mentioned defects in the subordinate structure, and includes a needle that moves up and down, a driving means for driving the needle, and a drive means disposed near the point where the needle falls. a cloth feeding device for transporting the work cloth on the work cloth support surface based on the operation of the driving means; and a cloth feeding device disposed on the work cloth support surface in front of the cloth feeding side of the cloth feeding device and accommodating the work cloth. a plurality of guide plates spaced apart from each other in order to , an actuating means for changing the distance between the guide plates, and a distance between the guide plates, which is connected to the actuating means, and is set in advance based on the position of the corrugated portion of the work cloth when sewing is being performed by the actuation of the driving means. control means for widening the interval between the guide plates for a predetermined period in response to a detection signal output from a detector that detects the stepped portion or a detection signal output from a detector that detects the stepped portion. A new work cloth guide device for a sewing machine is provided that can widen the gap between the guide plates so that the work cloth is smoothly transferred toward the needle drop point when the stepped section passes between the guide plates. The purpose is to provide.

Hereinafter, an embodiment of a vertically adjustable feed sewing machine embodying the present invention will be described with reference to the drawings. In the drawings, 10 is a sewing machine table; 11 is a sewing machine body equipped with a sewing machine table 10'; The sewing machine body 1 is equipped with an arm 13, and transmits a stitch count pulse signal SG1 (one signal is generated for each round trip of the needle up and down), a needle upper layer stop signal SG2, a needle lower layer stop signal and a thread trimming signal SG4.
1 is provided with a position detector 14 that generates a position based on the rotation of a main shaft (not shown).

M is a DC motor (hereinafter referred to as a motor) for driving the sewing machine that is attached to the bottom of the sewing machine table 10, and 15 is a pedal that is attached to the bottom of the sewing machine table 10. The operation of the sewing machine is controlled by rotating the motor M at a speed corresponding to the amount of depression.

16 is a throat plate provided on the bed 12, and the throat plate 16
A work cloth support surface 17 is formed by the upper surfaces of the sewing machine bed 12 and the sewing machine table 10.

18 is a needle, turtle 9 is a presser foot, 20' is a feed dog ~ 2 is a feed foot that feeds the work cloth upward by an upward feed mechanism (not shown) built in the arm 13; The presser foot 19, the feed dog 20, and the cloth feed foot 21 cooperate to constitute a cloth feeding device.

22 is a support arm of the cloth feed leg 21.

A work cloth guide device G embodying the present invention is installed on the work cloth support surface 17 on the cloth feeding side of this feeding device, and a control circuit having a built-in control circuit for controlling the work cloth guide device G is installed. A box 23 is installed on the underside of the sewing machine table 17. Therefore, ``First, we will explain in detail the configuration of the workpiece cloth guide device G installed on the sewing machine table 10''.
1 is a support plate attached to the front right side of the upper surface of the bed 12, and a support arm 30a is formed at the rear left end of the support plate.

Reference numerals 32, 33, and 34 are three guide plates disposed on the work cloth support surface 17 for accommodating the work cloths K1 and K2 separately, as shown in FIGS. 2a and 5. A support rod 38 is installed near the front end of the lower surface of the lower guide plate 34 by a pair of mounting members 37 in a lateral direction perpendicular to the cloth feeding direction, and this support rod 38 slides on the support arm 30a of the support plate 30. At the same time, the rear end of the lower surface of the lower guide plate 34 is supported in contact with the work cloth support surface 17 .

As a result, each guide plate 32, 33, 34 is arranged in an inclined manner so as to gradually become higher toward the cloth feeding side, and in this embodiment, the lower guide plate 3 with respect to the work cloth support surface 17
4 is set at 10 degrees, and a cone-shaped space 39 is formed between the inclined lower guide plate 34 and the work cloth support surface 17. Further, as shown in FIG. 2a and FIG. 8, recesses 32a and 33a are formed on the right side of the front ends of the upper and intermediate guide plates 32 and 33, and recesses 32a and 33a are formed on the left edge of the intermediate guide plate 33. An overhanging portion 33b is formed that projects slightly from the left end of the guide plate 32, and this overhanging portion 33b allows the upper work cloth KI to be easily inserted between the upper and middle guide plates 32, 33. .

Further, on the left edge of the lower guide plate 34 is an intermediate guide plate 33.
An auxiliary guide plate part 34a is formed that protrudes more than the left end protruding part 33b, and this auxiliary guide plate part 34a
It is formed into a substantially mountain-shaped cross section so as to gradually become lower in the front and rear direction around the central top that appears in a sloping shape in FIG. The work cloth K2 can be easily inserted, and even when the guide plates 32, 33, and 34 are moved to the rest position on the right as described later, the falling point of the needle 18 can be easily inserted along this auxiliary guide plate part 34a. It is designed so that the fabric to be processed can be smoothly guided towards the machine. Reference numeral 40 denotes four guide pins fixed to the lower guide plate 34 by caulking or the like at the lower end so as to be located on one side in the cloth feeding direction passing through the drop point of the needle 18. As shown in Figure 4, they extend upward through the intermediate and upper guide plates 33, 32, are curved convexly toward the left, and are arranged so as to be diagonal toward the left rear. .

Reference numeral 41 denotes a pair of left and right support pins fixed to the lower guide plate 34 by caulking or the like at the lower end, and extends upward through the intermediate and upper guide plates 33, 32, and a strip ring 42 is attached to their upper ends. A spring receiver 43 is attached.

44 are springs interposed between the spring receivers 43 and the intermediate guide plate 33, and the intermediate guide plate 33
is urged toward the guide plate 34 below.

Reference numeral 45 denotes a pair of left and right connecting pins fixed to the intermediate guide plate 33 by caulking or the like at the lower end, which extend upwardly through the upper guide plate 32, and have connecting washers attached to their upper ends by strip rings 46. 47 is installed.

48 is a gate-shaped mounting frame fixed on the upper guide plate 32;
Reference numeral 49 denotes an air cylinder provided between the mounting frame 48 and the lower guide plate 34, which connects the cylinder portion 49a fixed to the mounting frame 48 and the lower guide plate via a cylindrical connecting body 50. 34 and a piston rod 49b connected to the upper guide plate 32 to raise or lower the upper guide plate 32.

Therefore, when the guide plate 32 is raised due to the switching operation of the air cylinder 49, the guide plate 32 moves to the connecting washer 47 of the connecting pin 45 after the lost motion occurs.
The intermediate guide plate 33 is raised against the elastic force of the spring 44, and the intermediate guide plate 33 is engaged with the upper guide plate 32 and the intermediate guide plate 33, and between the intermediate guide plate 33 and the lower guide plate. A gap is formed between the plate 34 and the plate 34 to facilitate insertion of the work cloths K1 and K2. Reference numeral 51 denotes a pair of upper and lower spacers that are removably inserted between the guide plates 32, 33, and 34 on one side in the cloth feeding direction passing through the drop point of the needle 18 in order to regulate the spacing in the lowered state. In Fig. 2a,
As shown in FIGS. 4 and 8, the guide pin 401 is fitted on one side of the guide pins from a direction perpendicular to the cloth feeding direction to prevent movement of the smoother 51 in the joining direction and the cloth feeding direction. Four regulating recesses 51c are formed, and
A curved and oblique guide surface 51b is formed between the recesses 51a so as to match the arrangement of the guide pins 40.

The guide surface 51b and the guide pin 40
The edges K1a and K2a of the work cloths K1 and K2 introduced between the guide plates 32, 33, and 34 are engaged with and the edges K
1a and K2a, and both work cloths K1 and K2 are guided toward the point where the needle 18 falls. Further, on the right side of the front end of each of the spacers 51, there are upper and intermediate guide plates 32,
Operating portions 51c are formed to protrude forward from recesses 32a and 33a formed in 33, respectively, and the support pins 41 and connecting pins 45 arranged on the left side are provided at the rear end.
A diagonal recess 51d for avoiding the piston rod 49b of the air cylinder 49 and a diagonal recess 51e for avoiding the connecting body 50 are formed, respectively. Reference numeral 52 denotes an intermediate guide plate 33 and a lower guide plate 34 so as to be located in the right recess 51e of each spacer 51.
Parallelogram-shaped regulating member bodies are respectively fixed on the upper surface, and as shown in FIGS. 4 and 8, the piston rod 49b of the air cylinder 49 and the connecting body 50 are passed through the intermediate portions thereof. When the guide plates 32733 and 34 are opened by the switching operation of the air cylinder 49 and the smoother 51 is replaced with one of a different thickness, the regulating body 52 is inserted into the smoother 51 from the cloth feeding side. After engaging with the deep part of the right recess 51e and regulating the smoother 51 to a position where each recess 51a matches each guide pin 48 in the direction perpendicular to the cloth feeding direction, each recess 6
The spacer 51 is allowed to move in the lateral direction so that the apertures a fit with each guide pin 40.

A mounting plate 54 fixed to the front end of the upper surface of the upper guide plate 32 is a blocking member that is removably screwed and fixed to the mounting plate 53 as shown in FIGS. 8 and g. A blocking pin 54a is formed protruding from its lower end, and by attaching the blocking body 54 after setting each of the smoothing parts 58 at a predetermined position, the blocking pin 54a is connected to each guide plate 329 339 34 and both smoothing plates 5. The guide pin extends downward through the hole to prevent the flat surface from moving in a direction opposite to the direction in which the recess 5a is aligned with the guide pin base.

55956 is the needle 18 for the four guide pins
Even if it is a box-shaped mounting frame fixed to the upper surface of the upper guide plate 32 and the lower surface of the lower guide plate 34, respectively, so as to be located on the opposite side across the cloth feeding direction passing through the falling point of the second
As shown in the drawings and FIG. 5, stoppers 57 are attached to the upper surface of the upper mounting frame 55 and the lower surface of the lower mounting frame horse 6, respectively.

Reference numerals 58 and 59 denote pressing pieces consisting of a pair of upper and lower leaf springs fixed at one end to the lower surface of the upper mounting frame 55 and the upper surface of the lower mounting frame 56, respectively, as shown in FIGS. 5 and 6. At the other ends of the upper and lower guide plates 32 and 34, an intermediate guide plate 33
The pressing parts 58a, 59a extending to the side are threshed, and the three guide plates 32, 33,
34, the work cloths K1 and K2 introduced between the intermediate guide plate 3
3 from above and below respectively, and when the work cloths K1 and K2 are transferred by the presser foot 19, the feed dog 20, and the feed foot 211, rotational movement is given to these work cloths, and this green K1a , K2a are brought into contact with the guide pin 40 and the guide surfaces 51b of both the spacer 5 blades.

60 and 61 are rotatably attached to the upper surface of the upper mounting frame 55 and the lower surface of the lower mounting frame 56 so that they can be operated from the upper part of the upper guide plate 32 and the front of the lower part of the upper guide plate 34, respectively. A pair of upper and lower adjustment dials, as shown in FIGS. 5 and 6, have adjustment shafts 60a and 6.
The tip of 1a is the pressing piece 58? 59 approximately in the center, and the adjustment dial 60? The elastic pressing force of the pressing pieces 589 to 59 can be adjusted by rotating the pressing pieces 61.

Reference numeral 62 denotes stop pins protruding from the lower surface of the upper adjustment dial 60 and the upper surface of the lower adjustment dial 6, which engage with the stopper hole to regulate the rotation range of each debate dial. It looks like this.

Reference numeral 63 denotes a scale attached to the upper surface of the adjustment dial 5Q to 6, which is attached on the upper mounting frame 55 and the lower guide plate 34 as shown in Fig. 2a and Fig. 2. Indicator 6
In cooperation with 4, the adjustment dial 6Q9 6 is designed to instruct the adjustment amount of the elastic force.

In this embodiment, as shown in FIG. The elastic pressing force of both pressing pieces 5 and 5 is applied to the sewing machine body Q gate on the sewing machine table amount Q without raising it above the sewing machine table amount Q. It can be easily adjusted. Detector 5 is a detector disposed on the side of the pressing point of the work cloth K2 by the pressing pieces 5 and 59. As shown in Figure y, a pair of mounting plates 65a and 65b are fixed to the upper surface of the upper guide plate 3 and the lower surface of the lower guide plate 34, and a floodlight 65c is attached to the lower surface of the upper mounting plate 6a. Each guide plate 329 includes a light receiver 65d attached to the upper surface of the lower mounting plate 65b so as to receive light from the projector 65c through the closed portion formed in the guide plates 32, 34. , 34 between the processed cloths K1 and K2
is designed to detect the presence of

65e and 65f are a pair of upper and lower transparent plates competitively fixed to the closed portions of the upper and lower guide plates 32 and 34 so as to pass the light from the projector 65c, and the upper transparent plate 65e
The lower surface of the lower transparent plate 65f is arranged on the same plane as the lower surface of the upper guide plate 32, and the upper surface of the lower transparent plate 65f is arranged on the same plane as the upper surface of the lower guide plate 34.
In addition to preventing dust from entering into the transparent plates 65e and 65f, since they are arranged on the same plane, dust adhering to the transparent plates 65e and 65f can be wiped off when the work cloths K1 and K2 pass through. It has become. During the automatic cycle, the detector 65 detects the workpiece cloths K1 and K2, and the operator presses the sewing machine start button (not shown).
When the above operation is performed, the air cylinder 49 is switched and operated, and the upper and intermediate guide plates 32, 33 can be lowered, and following the lowering, the operation of the sewing machine is started. It has become so. Further, during the manual cycle, a similar operation is performed when the pedal 16 is operated instead of the sewing machine start button. Thereafter, when the required sewing is performed and the rear end of the workpiece cloth is detected by the light projector 65c, the operation of the sewing machine is stopped and the upper and middle guide plates 32, 33 are raised. Next, each of the guide plates 32, 33, 34 is attached to the spacer 5.
1, etc., along a direction perpendicular to the direction in which the cloth is fed by the cloth feeding device, between the use position shown in FIGS. 2a and b' and the rest position shown in FIG. To explain the structure of the operating means, reference numeral 66 is an air cylinder provided between the support plate 30 on the sewing machine bed 12 and the right mounting member 37 protruding forward from the lower guide plate 34. Support plate 30 by 67
A cylinder part 66a fixed to the right side of the upper surface and a piston rod 66b connected to the mounting member 37 with a nut 68 so that the mounting position can be adjusted are provided. The guide plates 32, 33, 3
4 etc. are moved along the support rod 38 between a use position and a rest position.

When moving from the rest position to the use position, the upper and intermediate guide plates 32, 33 are raised in cooperation with the switching operation of the air cylinder 49, and the movement is performed while maintaining the raised position. It's starting to stir. As a result, when the workpiece cloth guide device G moves to the use position, the guide plates 32 and 33 are already raised, so the workpiece cloths K1 and K2 can be inserted immediately, reducing the sewing work time. can. Reference numeral 69 denotes an adjustment bolt as a stopper screwed onto the right side mounting member 37 so that its position can be adjusted, and a spring 70 is interposed between its head and the mounting member 37.

71 is a locking piece fixed to the left side of the upper surface of the support plate 30 so as to be able to engage with the head of the adjustment bolt 69;
As shown in FIGS. 2a and 3, the air cylinder 6
When the guide plates 32, 33, 34, etc. are moved to the left use position by the switching operation of 6, they are engaged with the adjustment bolt 69 to stop those guide plates etc. at the left use position. ing.

72 is a scale for indicating the seam allowance attached to the upper right side of the support plate 30, and as shown in FIG. 11, the guide plates 32, 33, 34, etc. have been moved to the right rest position. state, the adjusting bolt 69 is adjusted based on this scale 72.
By adjusting the position, the use position of the guide plate etc. changes from side to side, and the work cloth K1, which is guided to the falling point of the needle 18,
The positions of the edges K1a and K2a of K2 are changed so that the seam allowance can be adjusted.

Next, the operation of the cloth feeding device and workpiece cloth guide device G of the vertically adjustable feed sewing machine configured as described above will be explained.As shown in FIG. When in the state, the processing cloth guide device G
When the power is turned on to operate the air cylinder 49, the electromagnetic valve (not shown) for operating the air cylinder 49 is first controlled to operate, and the air cylinder 49 is switched to operate, causing the cylinder portion 49a to rise. The upper guide plate 32 is lifted up via the mounting frame 48.

At the beginning of this upward movement, the upper guide plate 32 is connected to the connecting pin 4.
5, the intermediate guide plate 3
3, and then the upper guide plate 32 engages with the connecting washer 47 at the upper end of the connecting pin 45,
The intermediate guide plate 33 is raised against the elastic force of the spring 44. Therefore, a sufficient gap is formed between the upper guide plate 32 and the intermediate guide plate 33 and between the intermediate guide plate 33 and the lower guide plate 34, as shown in FIG. After this sufficient gap is formed, the operation of the electromagnetic valve (not shown) for operating the air cylinder 66 is controlled, and the air cylinder 66 is switched and operated to close its piston. By pushing the rod 66b to the left, the twisted cloth guide device G is moved along the support rod 38 to the use position. Therefore, using the left end protruding portion 33b of the intermediate guide plate 33 and the left end auxiliary guide plate 34a of the lower guide plate 34, the work cloths K1 and K2 are introduced into the gap and their edges K1a and K2a are guided. When the pin 401 is brought into contact with the workpiece cloth, light from the light emitter 65c to the light receiver 65d of the detector 65 is blocked by the workpiece cloth, and the detector 65 determines the set state of the workpiece cloth. Thereafter, when the pedal 15 of the sewing machine, for example, the sewing machine start button (not shown) in an automatic cycle, is operated, the air cylinder 49 is switched and the upper and intermediate guide plates 32, 33 are lowered.
As shown in FIG. 5, the pressing portions 58a of the pressing pieces 58, 59,
59a comes into contact with the work cloths K1 and K2, respectively, and both work cloths are pressed against the intermediate guide plate 33. Then, in this state, the sewing machine is automatically operated and sewing is started. In addition, in this embodiment, during sewing, the above-mentioned control is performed in advance by trial sewing, etc., the thick stepped portions, sagging parts, and rear end portions of the workpiece fabric caused by folding at the sewing location of the workpiece cloth. Sewing is performed based on the signal or detection signal preset in the opening/closing control circuit of the sewing machine drive and work cloth guide device built in the box 23,
When the stepped portion passes between the guide plates 32, 33, and 34, the air cylinder 49 is activated to raise the upper guide plate 32 and the intermediate guide plate 33 to enable the passage, and to drive the sewing machine. The motor M is controlled to reduce the feed speed of the work cloth, and the cloth feed foot 2 is
The electromagnetic cutting valve attached to the air cylinder for shirring, which acts on the upper feed mechanism to adjust the feed amount in step 1, is operated to increase the feed amount, and the detection signal of the rear end portion of the work cloth is Based on this, the sewing machine is stopped after a predetermined number of stitches have been sewn after the detection, and the sewing is completed at a certain distance from the trailing edge of the work cloth.

Then, as soon as the sewing is completed, the air cylinder 4
9 is operated to raise the upper and middle guide plates 32, 33, so that the next work cloth can be sewn continuously. Next, an electric circuit for controlling the operations of the cloth feeding device and the workpiece cloth guiding device during sewing as described above will be explained based on FIGS. 12 to 14. This electric circuit can be roughly divided into sewing using a test fabric, and the amount of movement of the fabric is determined by a stitch count pulse signal (the needle 18 is
In terms of the number of SGIs (which generate one pulse by reciprocating), in the sewing area of the work cloth, the stepped portion is located on the guide plates 32, 33,
The position passing between 34, the sagging part, and the number of stitches at the end of warp (the number of stitches from when the trailing edge of the work cloth is detected until the sewing machine stops) are determined and preset as the number of stitch count pulse signals SGI from the start of sewing. An input circuit 80 (see FIG. 12) that generates a signal, and a preset signal from the input circuit 80 is stored, and when sewing the work cloth, it is processed into stepped portions, stubbed portions, etc. based on the stored preset signal. A control circuit 81 (see FIG. 13) controls the raising and lowering of upper and middle guide plates 32 and 33 of the cloth feeding device and the workpiece cloth guide device when the cloth approaches, and the sewing machine operates based on the control circuit 81. A speed control circuit 82 (see FIG. 14) controls the speed of the driving motor M. First, to explain the details of the input circuit 80', 83 is the NA
It is an ND circuit, and one input terminal has an automatic cycle/
The trial sewing signal SG5 that is generated when the switch (not shown) for switching the operating cycle of the sewing machine between manual cycle and trial total cycle is set to the trial sewing cycle is input, and the other input terminal is used to drive the sewing machine. At the same time, a stitch count pulse signal SGI generated from the position detector 14 is input.

Therefore, during trial sewing, the output of this NAND circuit 83 provides an output waveform responsive to the stitch count pulse signal SGI. U
C inputs the output from the NAND circuit 83, and 999
It is a counter that can count up to 1, and is composed of addition counters UC1, UC2, and UC3 that count the ones place, tens place, and hundreds place, respectively, and each addition counter UC1, UC2 and UC3 are 2
I am using the Evolution IG Hayabusa counter.

84 connects its output terminal to each of the addition counters UC1, UC.
2. A gate circuit composed of a NOT circuit and an OR circuit connected to UC3, which is a work cloth detection signal SG for detecting the front edge green and rear edge green of the work cloth detected by the detector 65.
Each addition counter UC1, UC2, UC3 is cleared by a signal based on the rise and fall of 6.

DDI, DD2, and DD3 are decoders/drivers respectively connected to the output terminals of the addition counters UC1, UC2, and UC3.
In D3, the cloth detection signal SG6 and the trial sewing signal SG5 are inputted through the NOT circuit 85 and the NAND circuit 86), and each of the preceding addition counters UC1, UC2, U
The C3 binary BCD code is converted into a decimal number and input to the number displays L1, L2, and L3 for each position in the next stage, so that the number of stitch pulses is displayed digitally from the start of sewing. .

Therefore, among the sewing parts of the work cloth for trial sewing, the guide plate 32,
The opening period of the guide plate at the stepped part of the work cloth between 33 and 34, the sagging period, and the period during which the sewing machine is stopped after the trailing edge of the work cloth is detected (the number of stitches at the end of sewing) are the stitch number pulse signal SGI. In addition, each addition counter UC1, UC2,
The BCD code of the output of UC3 is assigned to each contact al~a3, bl.
~b3, cl~c3, and dl~d3 are input to the control circuit 81 (to be described later), and the number of stitches in the stepped section of the work cloth, the number of shirring stitches, and the number of stitches at the end of sewing are stored in a binary coded BCD code. I try to let them do it. Next, the control circuit 81 will be described. SR1a, SR1b, and SR1c are registers connected to the output terminals of the addition counters UCI, UC2, and UC3 of the input circuit 80, respectively, and temporarily store the BCD code. The starting position at which the stepped portion of the work cloth passes between the work cloth guide plates 32, 33, and 34 is stored as the number of stitch count pulse signals SGI from the start of the total trial.

Then, preset counters DC1 a, DC1 b, DC1 are subtracted based on the stitch count pulse signal SGI of the next stage.
Each is preset to c. SWI is a load switch for resistors SR1a, SR1b, and SR1c. SR2a, SR2b, and SR2c are also input circuits 80
This register is connected to the output terminals of each addition counter UC1, UC2, UC3, and temporarily stores the BC code, and is used to determine the position from the start of mystery sewing to the position where the stepped portion of the work cloth completes passing through the work cloth guide plate. The number of stitches is stored as the number of pulse signals SGI. A preset counter DC2 subtracts based on the next stage stitch count pulse signal SGI.
a, DC2b, and DC2c, respectively. SW2 is this register SR2a, SR2b, SR2c
It is a load switch. SR3a, SR3b, SR3
Similarly, c is each addition counter UC1, UC2, UC3.
The register is connected to the output terminal of and temporarily stores the BCD code, and is adapted to store the first layer of the sagging portion of the work cloth as the number of stitch count pulse signals SGI from the start of trial sewing. There is.

Then, preset counters DC3a, DC3b, and DC3c are respectively preset to subtract based on the stitch number pulse signal SGI of the next stage. SW3 is this register SR
3a, SR3b, and SR3c load switches. S
R4, SR4b, and SR4c are similarly connected to the output terminals of the addition counters UC1, UC2, and UC3, and their BC
This register temporarily stores the D code, and stores the end position of the shirred portion on the work cloth as the number of stitch count pulse signals SGI from the start of the trial. Then, preset counters DC4a, DC4b, and DC4c are respectively preset to subtract based on the stitch number pulse SGI of the next stage. SW4 is this register SR4a, S
This is a load switch for R4b and SR4c. SR5a,
SR5b is a register which is also connected to the output terminal of each of the addition counters UC1 and UC2 and temporarily stores the BCD code, and stores the count (number of stitches at the end of sewing) from detection of the trailing edge of the work cloth until the sewing machine stops. It is supposed to be done. And the preset counter DC5a, DC for the next stage subtraction
5b, respectively. SW5 is a load switch for resistors SR5a and SR5b, and 87 is a NAND circuit whose output terminal is connected to the input terminal of the preset counter DC5a, one input terminal of which receives the stitch count pulse SG1, and the other input terminal of which is connected to the input terminal of the preset counter DC5a. The terminal has the detector 6
A signal SG6 which is the negation of the cloth detection signal SG6 from 5 is input. Therefore, during trial sewing, the input circuit 8
0, the stitch number pulse signal SGI is counted and the sewing location of the work cloth is detected, and the stepped portion is detected by the guide plates 32, 33,
34, stop the sewing machine once, press the load switch SWI, and at that point start the addition counter UC.
1, UC2, UC3 BCD code in register SR1a
, SR1b, and SR1c and stored therein, the sewing machine is driven to pass through the stepped portion. When the sewing machine has completed passing through the stepped section, the sewing machine is stopped again, load switch SW2 is pressed, and the addition counters UC1, UC2, UC are set at that point.
3 BCD code in registers SR2a, SR2b, SR
2c and store it. Then, sew again in a normal state, and when the next time the sagging part is reached, stop the sewing machine again, press the load switch SW3, and read the BCD codes of the addition counters UC1, UC2, and UC3 at that point in the registers SR3a and SR3b. , after storing it in SR3c, restart the sewing machine, sew the sagging part, and when it reaches the end, stop the sewing machine again and press the load switch SW4 to set the addition counter UC1 at that point.
, UC2, UC3 are stored in register SR4a,
Input to SR4b and SR4c and store.

Further, registers SR5a and SR5b output a stitch count pulse signal S which indicates the amount of movement of the workpiece cloth until the rear end of the trial workpiece cloth passes through the detection section of the detector 65 of the workpiece cloth guide device and sewing is completed.
Convert it to the number of GI, set a number smaller than that number, and press the load switch SW5 to set the addition counters UC1, UC2.
The BCD code is extracted and stored independently. As a result, the starting and ending positions of the middle part of the sewing part or the sagging part of the work cloth and the rear end of the work cloth are stored in each register by the trial sewing, and the storage in each register of the control circuit 81 by the trial sewing is finish. FFI is a flip-flop whose set side input terminal is connected to the sewing machine start switch SW6, and the other reset side input terminal is connected to the position detector 14 when sewing of the workpiece cloth is finished and the needle 18 is in the upper position. Generated needle upper layer stop signal SG2 and thread trimming signal S
It is connected to the output terminal of the NAND circuit 88 which inputs G4. Then turn on the sewing machine start switch SW6.
By doing so, the output terminal on the set side outputs a signal at the level /. 89 is a NAND circuit in which one of its input terminals is connected to the set side output terminal of the flip-flop FFI via a monostable multipipulator 90, and the other two input terminals are connected to the cloth detection signal SG6 and the cloth detection signal SG6, respectively. A signal generated when the operating power is turned on to the working position of the work cloth guide device G is inputted via a delay circuit 91.

The output terminal of this NAND circuit 89 is connected to the preset counters DC1a to DC5b, and each register SR
Each BCD code stored in 1a to SR5b is preset. Reference numeral 92 denotes an electromagnetic coil for operating an electromagnetic valve that operates the air cylinder 66 for moving the workpiece cloth guide device G to the use position, and is connected to the collector terminal of the switching transistor Trl.

RI is resistance. 93 is a NAN whose one input terminal is connected to the set side output terminal of the flip-flop FFI.
It is a D circuit, and its output terminal is connected via a NOT circuit 94 to the input terminals of NAND circuits 95 and 96 at the next stage.

97 also connects one of the input terminals to the flip-flop F.
This is a NAND circuit connected to the set side output terminal of FI, and its output terminal is connected to the base terminal of switching transistor Tr2 via NOT circuit 98 and resistor R2.

The collector terminal of this transistor Tr2 is connected to a low speed control lj switch CR2 of a speed control circuit 82, which will be described later. Further, the reset side output terminal of the flip-flop FFI is connected to the base terminal of the switching transistor Tr3 via a resistor R3. The collector terminal of the transistor Tr3 is connected to an IJ relay CR for stop control of the speed control circuit 82, which will be described later.
3 is being continued. FF2 has a set side input terminal connected to the output terminal of the preset counter DC1c, and a reset side input terminal connected to the preset counter DC2.
a flip-flop connected to the output terminal of the NAND circuit 96, whose reset side output terminal is connected to the input terminal of the NAND circuit 96, and whose reset side output terminal is connected to the input terminal of the NAND circuit 96;
It is connected to the input terminal of circuit 95.

The preset counters DCIa, DC1b,
When DC1c is subtracted by the stitch count pulse signal SGI and becomes 0, the set side output terminal of flip-flop FF2 becomes high level, and then the preset counter DC2a,
When DC2b and DC2c are subtracted by the stitch number pulse signal SCI and become 0, the reset side output terminal is inverted to a high level. Therefore, when the set side output terminal reaches the no level, the upper and intermediate guide plates 32
, 33 is excited via the drive circuit 100, and the electromagnetic coil 99 for operating the electromagnetic valve for the air cylinder 49 that raises the air cylinders 49, 33 is excited via the drive circuit 100, and the NAND circuit 96, N of the next stage is excited.
A speed control circuit 82, which will be described later, conducts the switching transistor Tr4 through the OT circuit 101 and the resistor R4.
Energize reed relay CR4 for medium and long distance control. On the other hand, when the reset side power terminal is reversed to high level, the next stage NAN
A relay relay CR for normal speed control of the speed control circuit 82, which will be described later, conducts the switching transistor Tr5 through the D circuit 95, the NOT circuit 102, and the resistor R5.
5 is excited. FF3 has its set side input terminal connected to the output terminal of the preset counter DC3c, and its reset side input terminal connected to the preset counter DC4.
A flip-flop is connected to the output terminal of c, and the set side output terminal thereof is connected to an upper feed mechanism for adjusting the feed amount of the feed foot 21 of the feed device of the cloth feed device via a drive circuit 103. An electromagnetic coil 104 for actuating an electromagnetic valve attached to an air cylinder (not shown) for sagging is connected.

And the preset counters DC3a, DC3b, D
When C3c is subtracted by the stitch number pulse signal SGI and becomes 0, the set side output terminal becomes high level, and the electromagnetic coil 104 is excited to increase the feed amount of the feed foot 21. Next, preset counter DC4a,
When DC4b and DC4c are subtracted by the number of stitches pulse signal SGI and become 0, the reset side output terminal is inverted to the level /. Therefore, the electromagnetic coil 104 returns the feed amount of the feed foot 21 to the normal feed amount. FF4 is a flip-flop whose set side input terminal is connected to the output terminal of the preset counter DC5b, and its set side output terminal is connected to the NAND circuit 97, and its reset side output is connected to the NAND circuit 93. ing.

Then, when the preset counters DC5a and DC5b are subtracted to 0 in the same manner as the flip-flops FF2 and FF3, the set side output terminal becomes the /.-level and this high level is input to the NAND circuit 97. And N
When one input terminal of the AND circuit 97 receives the output from the flip-flop FFI at the level . Reference numeral 105 denotes a NAND circuit connected to the reset side input terminal of the flip-flop FF4, to which the needle advance stop signal SG2 and thread trimming signal SG4 are input.

FR is a set circuit that is connected to the reset side input terminal of each flip-flop FFI to FF4, and generates a pulse signal when the power supply is connected to the reset side input terminal of each flip-flop FFI to FF4.
FF4 is set to IJ. Next, the speed control circuit 82 will be explained. 106 is a known D/C motor speed control unit, which feeds back electromotive force of the motor M negatively to a comparator 107 and compares it with a reference voltage to detect the rotation speed. The error in the number of rotations is inputted to the interlock circuit 109 via the next-stage amplifier 108 to generate a positive phase pulse signal and a negative phase signal, respectively.
1 to the braking power transistor Tr6 of the motor M.
and the base terminal of the drive power transistor T7.

MG is a power supply for driving the motor, and a rectifier circuit 112 rectifies alternating current into direct current, which is applied to the motor M. R6,R
7, R8 is a resistor, and SOL is a coil. R9, RI0
, RII are variable resistors that apply a reference voltage to the comparator 107 to determine the rotation speed, and variable resistors R
9 indicates that the motor M is at a normal sewing speed (450 in the embodiment).
The comparator 10 is connected to the comparator 10 via the reed relay CR5 and the diode DI.
7, set the resistance value so that the variable resistor RI is also medium (180 ratio p m in the example), and connect it to the comparator 107 via the reed relay CR4 and diode D2. , the resistance value of the variable resistor RII is set so that the speed is similarly low (25 melon・p・m in the example),
It is connected to comparator 107 via diode D3 and reed relay CR2.

R12, R13, and R14 are resistors for adjusting the voltage division ratio of the variable resistor. Further, the reed relay CR3 has its contacts connected between the bus bars P and N, and when the reed relay CR3 is in the ON state, the drive of the motor M is stopped by short-circuiting the bus bars P and N. ing. Next, the general operation of the above electric circuit will be explained.

Now, the number of stitches pulse signal SGI from the front end to the rear end based on the trial sewing of the trial work cloth is 50, and the passing start point between the guide plates 32, 33, and 34 of the step part. is ION
The completion point of the solid stitch is the 150th piece, the start time of the sagging part is the 300th piece, the end point of the sagging part is the 400th piece, and the rear end of the workpiece cloth is detected by the detector 65 installed in the workpiece cloth guide device G.
Assuming that the point of passing is 49, the control circuit 8 1
The registers SR1a to SR1c have a value of 100, the registers SR2a to SR2c have a value of 150, and the register SR3
a to SR3c have a value of 300, registers SR4a to SR
A value of 400 is stored in 4c, and a value of 8 is uniquely stored in registers SR5a and SR5b. In this state, the workpiece cloth is set at the sewing position. At this time, since the detector 65 is detecting the presence of the work cloth, a high level signal is input to the NAND circuit 89 and a low level signal is input to the NAND circuit 87 based on the cloth detection signal SG6. Further, since the workpiece cloth guide device is in the use position, a signal of /.-level is input to the NAND circuit 89. And the sewing machine start switch SW6
By pressing , the set side of the output terminal of the flip-flop FFI becomes the level, and the output of the NAND circuit 89 is set to the level of the operating time of the monostable multipipelator 90 via the monostable multipipelator 90. The respective preset counters DC1a to DC5b are preset to the values stored in the registers SR1a to SR5b, respectively. Meanwhile, at the same time, the NAND circuits 93, 9
The output of No. 5 becomes low level, turning on the reed relay CR5 of the speed control circuit 82, and turning the motor M at 450 rpm.

It is driven at a rotational speed of p.m and L. Along with this driving, a stitch number pulse signal SGI is generated from the position detector 14. Then, the stepped portion of the processed cloth is located on the guide plates 32, 33, 3.
4 (the number of stitches pulse signal SGI is I
(generates a solid ON pulse), preset counter D
C1a, DC1b, and DClc are subtracted and become 0, and a low level signal is applied to the set side input terminal of flip-flop FF2, and the set side of the output terminal is set to /.
Invert the reset side to low level. Therefore, the electromagnetic coil 99 is excited and the air cylinder 49 is operated to raise the guide plates 32 and 33, allowing the work cloth to pass through the stepped portion. In addition, with the reversal of flip-flop FF2, the reed relay CR5 turns FF, and the IJ reed relay CR4 for medium and long distances turns N, reducing the rotation speed of the motor M to 450 m/p.
・Switch from m to 180 p.m. Information board 32, 3
3 releases the elastic pressing force of the pressing pieces 58, 59 against the workpiece cloth, so the edge of the workpiece cloth is no longer guided to the guide pin 40 and the guide surface 51b of the smoother 51, but at this time the speed of the sewing machine increases. Since the speed is reduced to 180 m.p.m., the worker can use his/her hand to assist the worker in aligning the green of the work cloth along the four guide pins. Then, when the stepped portion of the work cloth passes between the guide plates 32, 33, and 34 (the 150th stitch count pulse signal SCI is generated), the preset counters DC2a, DC2b, and DC2c are subtracted to 0, and the The reset side of the output terminal of flip-flop FF2 is inverted to high level, and the rotation speed of motor M is set to 4.
At the same time, the electromagnetic coil 9
9 is demagnetized and the guide plates 32 and 33 are lowered to return to the normal sewing state. Next, when the sagging part of the work cloth comes to the sewing location (the 300th stitch count pulse signal SGI is emitted), the preset counters DC3a, DC3b. OC3c is subtracted and becomes 0, and the set side of the output terminal of the next stage flip-flop FF3 is inverted to the /. level, and the electromagnetic coil 1 is
04 is excited.

As a result, the solenoid valve attached to the air cylinder that acts on the upper feed mechanism for adjusting the feed amount of the feed foot 21 is activated so that the feed amount of the feed foot 21 is increased, making it possible to sew the stubs. do. Then, when the sewing of the sagging part is completed (the stitch count pulse signal SGI generates a 40-stitch pulse), the preset counter DC4a
, DC4b, and DC4c are subtracted and become 0, the flip-flop FF3 is reversed, the electromagnetic coil 104 is demagnetized, and the feed leg 21 is switched to normal, so that normal sewing can be performed.

When the rear end of the work cloth passes the detector 65, the preset counters DC5a and DC5b start a subtraction operation.
When the rear end of the work cloth is reached, the preset counters DC5a, 5b are decremented to 0, and the set side of the output terminal of the next stage flip-flop FF4 is inverted to high level and the reset side to low level. and,
Based on the output, the normal speed control relay switch CR5 is turned off, and the low speed control relay R2 is turned on, so the rotational speed of the motor M is set to 25 m.p.
After that, the needle upper calendar stop signal SG2 and the thread trimming signal SG4 are generated from the position detector 14 and inputted to the reset side input terminal of the flip-flop FFI via the NAND circuit 88, and the reset side of the output terminal is inputted to the reset side input terminal of the flip-flop FFI. /・
level and turns on the stop relay CR3 to stop the motor M immediately. Then, the work cloth is prepared for the sewing operation and the process ends. In this way, the stepped part of the processed cloth,
The raising and lowering of the guide plates 32 and 33 is controlled based on signals set in advance in each control circuit 81 before sewing the sagging portion, etc., and the feed speed of the work cloth is automatically decelerated. Therefore, the workpiece cloth can be sewn continuously without having to raise or lower the guide plate each time during sewing or control the speed of the drive motor.

In this embodiment, the BCD code from the addition counter is stored outside each register of the control circuit 81 in accordance with the sewing order of the workpiece fabric, such as the stepped portion, then the swarmed portion, etc. The order in which each register is stored can be changed and used depending on the state of
Considering the case where the work cloth has two or more middle sections to be sewn, it is of course possible to incorporate registers and preset counters for detecting the passing positions of the sections and connect them to the flip-flop FF2. It is. Next, based on Fig. 15, we will create a configuration that can preset the values in each preset counter when the stepped portions and swarmed portions of the sewing area of the workpiece fabric are known and there is no need to perform trial sewing work in advance. To explain, SIa to S5b are each preset counter DC1a to DC5 in place of each register SR1a to SR5b shown in FIG.
This is a pushbutton switch for setting the number of stitches that applies a brisset input to b, and sets the values of the number of open stitches of the stepped section of the work cloth, the number of shirring stitches, and the total number of stitches at the end of the work cloth, which are known in advance. Then, each preset counter DC1a to DC5 of the next stage
b can be preset in the same way as in the previous embodiment.

Thereafter, the system can be operated in the same manner as in the embodiment described above. In addition, the push button switches SIa to S5 for setting the number of stitches
b are preset counters DC1a to DC shown in FIG.
Of course, it may be incorporated into 5b to create a configuration that is compatible with the trial method. Next, a third embodiment in which the guide plates 32 and 33 are raised when the stepped portion of the work cloth passes through the work cloth guide device will be described based on FIGS. 16 and 17. This is a micro switch attached to the upper surface of the front end of the guide plate 32 of the cloth guide device G, and its lever 116 is connected to the hole 11 bored in the guide plate 32.
7 and between the upper and intermediate guide plates 32 and 33. When the stepped portion of the work cloth KI passes through, the stepped portion pushes the lever 116 upward and presses the push button 118 to release the micro switch. I am trying to turn on 115.

As the micro switch 115 is turned on, the monostable multipipulator 119 shown in FIG. The electromagnetic coil 120 of the operating electromagnetic valve is excited. This causes the upper and middle guide plates 32, 33 to rise.
R16 and C are resistors and capacitors that determine the time constant of the monostable multipipe, and the monostable multipipe is designed to excite the electromagnetic coil 120 during the time it takes for the work cloth KI to pass between the guide plates 32 and 33. The pulse width of the regulator 119 is set. In addition, based on this embodiment, in order to control the speed of the motor M as in the previous embodiment, a relay that switches and operates the motor M for normal speed and medium distance is connected to the collector terminal of the transistor Tr8. Of course, it is possible to adopt a configuration in which the speed of the motor M is controlled to a medium speed when the power is on, and to a normal speed when the power is off.

Further, in this embodiment, the microswitch 115 is attached to the upper surface of the upper guide plate 32, but the micro switch 115 is attached to the upper surface of the upper guide plate 32.
4, or upper and lower guide plates 32, 3.
Of course, the guide plates 32 and 33 may be attached to the upper and lower surfaces of the guide plates 32 and 33 respectively to detect passage of the stepped portion of the work cloth and to raise and lower the guide plates 32 and 33. Note that this invention is not limited to the configurations of each of the embodiments described above, and it is possible to arbitrarily change the input circuit, control circuit, speed control circuit, microswitch, etc. without departing from the spirit of the invention. .

As described in detail above, the present invention includes a needle that moves up and down, a driving means for driving the needle, and a needle disposed near the needle drop point, which moves the work cloth to the work cloth support surface based on the operation of the driving means. a cloth feeding device for transporting the cloth at the top; a plurality of guide plates disposed on the work cloth support surface in front of the cloth feeding side of the cloth feeding device and spaced apart for accommodating the work cloth; ``A guide member provided between the guide plates for guiding the green of the work cloth introduced between the guide plates; and an actuating means connected to the guide plates for changing the interval between the guide plates. is connected to the actuating means, and in a state where sewing is being performed by the actuation of the driving means, a preset signal is output from a detector that detects the stepped portion or the stepped portion of the work cloth. By providing a control means for widening the above-mentioned interval for a predetermined period in response to a detected signal, when a thick step formed in a sewing area of the work cloth passes between the guide plates, The distance between the guide plates is widened to allow the work cloth to pass through smoothly.In addition, a speed control means is provided to slow down the transfer speed of the work cloth when the distance between the guide plates is widened, thereby reducing the elasticity of the pressing piece. Even when the workpiece cloth no longer follows the guide body as the force is released, the edge of the workpiece cloth can be made to follow the guide body manually by the worker, and has excellent industrial effects as a sewing machine cloth guide device. It is something.

[Brief explanation of the drawing]

Fig. 1 is a front view of a sewing machine showing the arrangement of a fabric guide device embodying the present invention, Figs. 2a and b are plan views of main parts showing how the fabric guide device is used, and Fig. 3 is a Figure 2 a. Fig. 4 is an enlarged sectional view taken along line 4-4 of Fig. 2 a, Fig. 5 is an enlarged sectional view taken along line 5-5 of Fig. 2 a, and Fig. S is an enlarged sectional view taken along line 5-5 of Fig. 2 a. 7 is an enlarged sectional view taken along line 7-7 of FIG. 2a, FIG. 8 is a sectional view of essential parts taken along line 8-8 of FIG. The figure is an enlarged cross-sectional view of the main part taken along line 9-9 in Figure 2a, Figure 10 is a cross-sectional view showing the guide plate opened from the state shown in Figure 4, and Figure 11 is the state shown in Figures 2a and b. 12 is an input circuit that counts the number of stitches pulse signal during the trial run, and FIG. 13 is a control circuit for operating the work cloth guide device. Fig. 14 shows a speed control circuit that controls the operation of the motor that drives the cloth feeding device based on the control circuit, Fig. 15 shows a control circuit that explains another embodiment that controls the operation of the guide device, and Fig. 16 shows the workpiece cloth. FIG. 17 is a sectional view of a main part explaining another embodiment for raising and lowering the device, and is also an electric circuit diagram thereof. 18... Needle, 19... Presser foot, 20... Feed dog, 21...
Feeding foot "32, 33, 34... guide board, 40...
Guide pin, 49, 66... air cylinder, 51... spacer, 80... input circuit, 81... control circuit, 82...
Speed control circuit, M...DC motor, G...processing cloth guide device. Figure 1 Figure 2 Figure 3 Figure 4 Figure 5 Figure 6 Figure 7 Figure 8 Figure 9 Figure 10 Figure 11 Figure 12 Figure 13 Figure 14 Figure 15 Figure 16 Figure 17 figure

Claims (1)

[Scope of Claims] 1. A needle that moves up and down, a driving means for driving the needle, and a needle disposed near the needle drop point, and transporting the work cloth on the work cloth support surface based on the operation of the driving means. a plurality of guide plates disposed on the work cloth support surface in front of the cloth feed side of the cloth feed device and spaced apart to accommodate the work cloth; a guide body provided between the guide plates for guiding the edge of the work cloth introduced between the guide plates; and an actuating means connected to the guide plates for changing the interval between the guide plates. is connected to the actuating means, and in a state where sewing is being performed by the actuation of the driving means, a preset signal based on the position of the stepped portion of the work cloth or a signal output from a detector that detects the stepped portion. A work cloth guide device for a sewing machine, comprising: control means for increasing the interval between the guide plates for a predetermined period in response to a detection signal. 2. A mechanism is provided between the guide plates for pressing the work cloth introduced between the guide plates, giving rotational motion to the work cloth when the work cloth is transferred by the cloth feeding device, and bringing the edge of the work cloth into contact with the guide body. A work cloth guide device for a sewing machine according to claim 1, further comprising a pressing piece. 3. A needle that moves up and down, a driving means for driving the needle, and a cloth feeding device arranged near the needle drop point and transporting the work cloth on the work cloth support surface based on the operation of the driving means. a plurality of guide plates disposed on the work cloth support surface in front of the cloth feeding side of the cloth feeding device and spaced apart to accommodate the work cloth; and a plurality of guide plates provided between the guide plates; a guide member for guiding the edge of the work cloth introduced between the guide plates; an actuation means connected to the guide plate for changing the interval between the guide plates; and an actuation means connected to the actuation means; While sewing is being performed by the operation of the driving means, the stitching is performed for a predetermined period of time in response to a preset signal based on the position of the stepped portion of the work cloth or a detection signal output from a detector that detects the stepped portion. A control means for increasing the distance between the guide plates, and a main speed control stage for reducing the movement speed of the needle by the drive means below the normal operating speed while the control means is activated. A processing guide device for a sewing machine, which is characterized by: