JPH07250982A - Sewing machine - Google Patents

Abstract

(57) [Summary] [Purpose] To simplify the work so that the operator can easily set the amount of shirring when performing shirring sewing. [Structure] When pulling up and down the upper and lower cloths so that the notches of the upper and lower cloths match and adjusting the vertical feed amount to form a stitch, the amount of bounce for each stitch is stored. The next stitch is formed according to the memorized amount of sham.

Description

Detailed Description of the Invention

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a barbed sewing machine used for sleeve setting, and more particularly to a barbed sewing machine which automatically stores in advance an accurate number of stitches in a sewing section where the amount of barking varies.

2. Description of the Related Art Conventionally, this type of false sewing machine is shown in FIG.
When the sleeve 1 is sewn to the body 2 as shown in (a) and (b), the notches a, b, c, d, e of the body 2 and the notches a ′, b ′, c ′ of the sleeve 1 are shown. , D ', e'must be pushed in so that the sleeves 1 match. Therefore, the operator performs the calculation necessary for sewing in each section based on the sewing pitch (lower feed pitch) and the cloth length, and inputs the calculation result. Figure 5
Is a diagram showing the amount of shirring in each step, in which the vertical axis represents the amount of shirring and the horizontal axis represents the number of needles. That is, since the shirring amount does not change in each of the A and C processes, the upper feed amount α of the A process is set to be the same as the lower feed amount. The upper feed amount β of the C process is set to a value obtained by dividing the sleeve length of the C process by the body length of the C process and multiplying this by the lower feed pitch. Further, in the steps B and D, since the amount of shirring changes, the number of stitches is calculated and set as follows. Number of stitches in Process B = Body length in Process B / Lower feed pitch Number of needles in Process D = Body length in Process D / Lower feed pitch

As described above, the conventional sewing machine has an annoying drawback that the operator needs to calculate the number of stitches. Further, the number of stitches obtained by the calculation does not take into consideration the cloth quality of the sewn product and the sewing speed, and there is a drawback that the last part of the shirring may shift in actual sewing. There are drawbacks that require skill. SUMMARY OF THE INVENTION The present invention improves on this drawback, and an object of the present invention is to provide a shirring sewing machine capable of automatically inputting the number of stitches. Another object of the present invention is to provide a shirring sewing machine capable of accurately and automatically inputting the number of stitches while actually sewing.

[Means for Solving the Problems] Detecting means for detecting rotation of the sewing machine spindle and generating a rotation signal for each rotation, counting means for counting the rotation signals, and upper and lower cloths separately in the cloth feeding direction. Vertical feed means for transferring, feed control means for individually controlling the feed amount of the vertical feed means, instructing means for instructing shirring by operation, and shirring for enabling creation of shirring data by instructing by the instructing means Controlling means for sewing while changing the shirring amount so as to match the notches provided on the upper and lower cloths, and storing the number of stitches sewn until the notches match. This is achieved by using a sewing machine that enables

The operator pulls the upper and lower cloths by hand and sews them so that the notches of the upper and lower cloths coincide with each other, and the number of stitches sewn therebetween is memorized to facilitate the sew-in sewing.

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described with reference to the drawings. FIG. 1 shows a circuit configuration diagram of a main part of an embodiment of the present invention. In FIG. 1, 9 is an initial setting circuit, 10 is a data setting circuit, 11 is a buffer, 12 is a sewing machine rotation detection circuit, 13
Is a teaching switch, 14 is a false switch, 1
5 to 17 are output determination circuits, 18 is a comparison circuit, 19 is an upper feed amount detection circuit, 20 is a mode determination circuit, 21 is a mode switching circuit, 22 is a counter, 23 is an upper and lower cloth position detection circuit,
24 is an output discriminating circuit, 25 is a thread trimming detecting circuit, 26 is an output discriminating circuit, 27 is a needle position detecting circuit, 28 is a needle number counting circuit, 29 is an upper feed amount calculating circuit, 30 is an output discriminating circuit, 3
1 is an upper feed motor control circuit, 32 is an upper feed motor, 33
Is a mode display circuit, 34 is a pattern display circuit, and 35 is a display circuit, which are connected as shown in FIG. 2 and 3 are flowcharts of an embodiment of the present invention. The characteristic operation of the embodiment of the present invention thus constructed will be described. First, the teaching mode, which is one of the features of the present invention, will be described. Buffer 1 by the initialization circuit 9
1 and the mode switching circuit 21 are initialized, the data setting circuit 10 sets the initial data such as the upper feed amounts α and β of the steps A and C, the shirring pattern, etc. in the buffer 11, and the teaching mode is initialized. The feed amount is initialized to the upper feed amount α of the process A (blocks 51 and 5).
2). Further, the setting contents are displayed by the display circuit 35 (block 52). In this state, the sewing machine rotation detection circuit 1
The output discriminating circuit 15 which discriminates the output from 2 discriminates the rotation state of the sewing machine (block 53). If the sewing machine is stopped, the stop output is sent to the comparison circuit 18. Further, the comparison circuit 18 constantly compares the content of the upper feed amount detection circuit 19 with the upper feed amount set in the buffer,
If the current upper feed amount is the initial setting value α (block 54), the output is sent from the comparison circuit 18 to the output determination circuit 16 and the input state of the teaching switch 13 is determined. If the teaching switch 13 is pressed (block 55), the output discrimination circuit 16 to the mode discrimination circuit 20
Output is sent to. The mode determination circuit 20 determines whether the current operation mode is the teaching mode or the sewing mode. If the current mode is not the teaching mode (block 56), the mode is switched to the teaching mode (block 57). As a result, the teaching mode is displayed on the display circuit 35 and the counter 22 is also initialized (block 57). When the teaching mode is set, the operator starts sewing for teaching (block 58). When the teaching mode is set by the mode switching circuit 21, the teaching mode is continued (block 59), but when the teaching switch 13 is further pressed during the teaching mode, the teaching mode is released (blocks 55 and 56). . As shown in FIG. 5, the operator starts sewing from the shirring process (shocking section) A, and presses the shirring switch 14 when the sewing is started in the process B in which the shirring amount changes for each stitch. . That is, the operator inputs the swallowing switch 14 at the notch point b. As a result, the content of the counter 22 becomes 1 and the teaching of the number of sewing needles in the process B is started (blocks 61 and 6).
2, 63). That is, the output discriminating circuit 30 discriminates the first input of the swallowing switch 14 (blocks 61 and 62),
The stitch number counting circuit 28 is driven to start counting the number of stitches (block 63). At the same time, the output determination circuit 30 reads the upper feed amount β from the buffer 11, and the upper feed motor control circuit 31 drives the upper feed motor 32 to set the upper feed amount to β (block 63). The operator pulls the cloth by hand and performs sewing in the process B while adjusting the amount of shirring so that the notches of the body and the sleeve finally match. When the sewing of the process B is completed, the swivel switch 14 is input at the notch point c. As a result, the content of the counter 22 becomes 2, and the output determination circuit 30 determines this (block 64). Here, skill is required to match the notches of the body and the sleeve. Therefore, for an unskilled person, in this embodiment, the upper and lower cloth position detecting circuit 23 mechanically detects whether the notches b and b'match. This upper and lower cloth position detecting circuit is configured, for example, to apply a marker to each notch point and detect this with a sensor. When the output discriminating circuit 30 discriminates the end of the sewing of the process B, an output is sent from the output discriminating circuit 30 to the output discriminating circuit 24. If the notches b and b ′ are mechanically coincident with each other, a coincidence signal is sent to the buffer 11. Sent (block 6)
5). As a result, the count content of the stitch number counting circuit 28 is stored in the buffer 11 as the number of stitches in the process B and displayed on the display circuit 35 (block 66). When the coincidence signal is not obtained from the output discriminating circuit 24, the content of the stitch number counting circuit 28 is not stored (block 65) and is not used as teaching data. In addition, the stitch number counting circuit 2
8 is reset after the contents are taken into the buffer 11 or after the output discriminating circuit 24 discriminates a mismatch signal. The operator sewes the process C after the process B, and then performs the sewing of the process D in which the amount of shirring changes for each stitch. That is, when the notch point d is reached, the buckling switch 14 is input. As a result, the content of the counter 22 becomes 3, and the output discriminating circuit 30 discriminates this (block 67). When the output determination circuit 30 determines the third time, the number of stitches counting circuit 28 counts the number of stitches (block 68). The operator pulls the cloth and adjusts the shirring amount to perform sewing, and when the notch point e is reached, the shirring switch 14 is input. As a result, the content of the counter 22 becomes 4, and the output discrimination circuit 3
0 determines this (No in block 67). In this state, the mechanical matching between the notches e and e ′ is determined by the same operation as described in the block 65 (block 6).
9). If the notches match, the contents of the stitch number counting circuit 28 are stored in the buffer 1 by the same operation as described in the above block 66.
1 is stored as the number of stitches in the process D, is displayed on the display circuit 35, the upper feed amount is set to α, and the swaging switch 14 is initialized (block 70). If the notches are mechanically inconsistent, the stitch number counting circuit 2
The contents of 8 are not stored in the buffer 11. When the operator performs thread trimming during sewing, the thread trimming detection circuit 25 generates a thread trimming output, which is discriminated by the output discrimination circuit 26, and the above operation is repeated from the beginning (blocks 72, 73, 74,
75). When the operator performs thread trimming after the teaching process is completed, the mode switching circuit 21 switches the mode in response to the coincidence signal from the comparison circuit 18 to release the teaching mode (blocks 72, 73, 74, 76). .
In this state, sewing is performed based on the number of stitches stored in the buffer 11 in the teaching mode. That is, the sewing for the process A is performed in the same manner as a normal barbed sewing machine (block 77). Next, the operator inputs the buckling switch 14 at the notch point b to sew the process B.
As a result, the content of the counter 22 becomes 1 and the output discrimination circuit 30 detects this (block 78) and the buffer 11
And output to the stitch number counting circuit 28. As a result, the initially set upper feed amounts α and β and the number of stitches in step B are read from the buffer 11 and stored in the upper feed amount calculation circuit 29. In this state, the upper feed amount calculation circuit 29
Calculates the amount of change in the shirring amount for one stitch as: amount of change = | β−α | / number of stitches in step B (block 79). Further, the stitch number counting circuit 28 is driven by the output from the output discriminating circuit 30, and the number of stitches is counted every time a stitch is dropped and output to the upper feed amount calculating circuit 29 (block 80). Based on the needle drop input and the change amount, the upper feed amount calculation circuit 29 increases the shirring amount by the change amount for each stitch, and the upper feed motor 32 raises the upper position for each stitch based on the shirring amount. The feed amount is changed (block 81). This operation is performed for each stitch, and is repeated until the current upper feed amount matches the set upper feed amount β and a comparison signal is output from the comparison circuit 18 (block 8).
2). When the coincidence signal is output, the sewing of step B is completed, the stitch number counting circuit 28 is reset by the buffer 11, and then the sewing of step C is performed (blocks 82 and 8).
8). When the operator sewes up to the notch d and inputs the shirring switch 14, the output discriminating circuit 30 discriminates this and gives an output signal to the buffer 11 and the stitch number counting circuit 28. As a result, the same operations as those described in the above blocks 79 to 82 are performed in the blocks 84 to 87. That is,
The upper feed amount calculation circuit 29 calculates the change amount of the shirring amount for one stitch as change amount = | α−β | / the number of stitches in process D (block 84). Further, the upper feed amount calculation circuit 29 increases or decreases the shirring amount by the above change amount for each stitch based on the needle drop input and the above change amount, and the upper feed motor 3
2 changes the upper feed amount for each stitch based on this shirring amount (block 86), and this sewing operation is repeated until a matching signal is output from the comparison circuit 18 (block 8).
7). As described above, according to the present invention, the shirring amount for each stitch is automatically adjusted based on the number of stitches taught. still,
In the above embodiment, the example using the upper and lower cloth position detecting circuit is shown, but if the operator has a high degree of skill, the same effect can be realized even if the upper and lower position detecting circuit is omitted. .

As described above, according to the present invention, the operation mode is switched between the teaching mode and the sewing mode, and the number of stitches for sewing in the process in which the shirring amount changes in the teaching mode is automatically stored. . Therefore,
Unlike the conventional device, it is not necessary to measure the body length and calculate the number of stitches. Moreover, since the number of stitches input to this device is input by teaching, there is no need to correct the number of stitches calculated by calculation as in the conventional device due to the material quality and sewing speed. Have an effect. In addition, since the operator pulls the upper and lower cloths and sews them so that the notches are aligned with each other and memorizes the number of stitches, an effect that the texture of the shirring can be finished neatly can be obtained.

[Brief description of drawings]

FIG. 1 is a circuit diagram of a main part of an embodiment of the present invention.

FIG. 2 is a part of a flowchart of one embodiment of the present invention.

FIG. 3 is another part of the flowchart with FIG. 2.

FIG. 4 is an explanatory diagram of the amount of shirring in each step.

FIG. 5 is an explanatory diagram showing the amount of shirring in each process.

[Explanation of symbols]

10 data setting circuit 11 buffer 12 sewing machine rotation detection circuit 13 teaching switch 14 shirring switch 15 to 17, 24, 26, 30 output determination circuit 18 comparison circuit 19 upper feed amount detection circuit 28 stitch number detection circuit 29 upper feed amount calculation circuit

Claims (1)

[Claims] 1. A detection means for detecting the rotation of a sewing machine spindle and generating a rotation signal for each rotation, a counting means for counting the rotation signal, and an up-down feed means for separately delivering upper and lower cloths in a cloth feed direction. A feed control means for individually controlling the feed amount of the vertical feeding means, an instruction means for instructing the shirring operation, and a shirring control means for enabling the creation of shirring data by the instruction of the above-mentioned instructing means. Then, it is possible to sew while changing the amount of shirring so that the notches attached to the upper and lower cloths match, and to store the number of stitches sewn until the notches match. Inclusive sewing machine.