JPH0339715B2 - - Google Patents

Description

[Detailed description of the invention]

[Industrial Application Field] The present invention relates to a sewing machine sewing management device that is capable of measuring the sewing machine operation status of each worker in a sewing factory. [Prior art and problems to be solved by the invention] Traditionally, garment factories have had a labor-intensive production system, and they have developed a scientific and rational method of sewing that helps workers increase their sewing machine utilization rate. A management device was requested. The present invention has been made in response to this need, and in particular, in order to easily find the optimal change in sewing speed during the sewing process in accordance with the processes that workers share, By making it possible to instantly grasp the operating status of the sewing machine during work,
The purpose is to increase the operating rate of sewing machines and increase productivity by improving the sewing skills of each worker, as well as to enable production volume control. [Means for Solving the Problems] The present invention includes a detection means for detecting a sewing speed in relation to rotation of a sewing machine main shaft, a discrimination means for dividing the sewing speed detected by the detection means into a plurality of speed ranges, A sewing machine characterized by comprising a time measuring means for adding the sewing time for each speed range divided by a discrimination means within a predetermined sewing section, and an output means for outputting the sewing time measured by the measuring means. This paper proposes a management device. [Example] An example of the present invention will be described below based on the drawings. Normally, to complete a sewn product, multiple workers share the entire sewing process. In Figure 1, 1 is a sewing machine that is one of several installed in a garment factory, and workers use this sewing machine 1 to repeatedly sew one process for the required number of pieces. It is. The sewing machine 1 drives a main motor 2 to rotate the main shaft of the sewing machine, and in conjunction with this main shaft, forms stitches on the cloth and feeds the cloth. 3 emits pulses in proportion to the rotation angle of the main shaft. It is a main shaft pulse generator that outputs, and converts the rotation speed (sewing speed) of the main shaft into a voltage using an F/V conversion circuit (detection means) 4 as a sewing speed detection means and inputs it to the CPU 5. For example, time measuring means (time measuring means) for each rotational speed cumulatively adds the duration for each rotational speed through a voltage discrimination means (discrimination means) 6 that classifies the speed into predetermined levels such as high speed, medium speed, and low speed.
7 data is input to CPU5. On the other hand, the stitch formation time is detected by the needle position detector 8 based on the output pulse of the main shaft pulse generator 3, and the number of stitches counted by the stitch number counter 9 is input to the CPU 5, and the The number of stitches is calculated in advance, and the output of the discriminating circuit 10 that makes it possible to determine the end of one process when the corresponding number of stitches has been obtained is determined in advance.
Input to CPU11. The CPU 11 is an arithmetic control means that detects the end of one process in a process to be repeated that is shared by workers, and inputs the end of the process to the CPU 5 by the process end detection means 12, and also controls the process until the end of the process. Process time measurement unit 1 that calculates time
3, and a sewing number counter 14 for determining the output of the worker can be input to the CPU 5. In addition to the discrimination circuit 10 based on the number of stitches, the following information sources are used by the CPU 11. That is, the well-known cloth detection unit 1 is capable of detecting the presence or absence of cloth placed on a sewing machine and determining whether or not sewing is performed.
5. An automatic thread cutter 16 of the sewing machine that operates at the end of one process, a pattern sewing detection unit 17 that enables pattern sewing by moving the fabric using a predetermined feeding device and guide device, and determining the end of a process, and an electronic memory. A programmed sewing detector 18 automatically completes sewing according to a predetermined sewing order stored in the means, determines the length of thread required to complete the sewing in the process, and consumes thread equivalent to this length during sewing. A thread payout amount detection unit 19 that can detect when sewing has been performed, a pedal switch 20 that can be stepped on by the operator to start and stop the rotation of the main shaft of the sewing machine, and a pedal switch 20 that can be stepped on by the operator to start and stop the rotation of the main shaft of the sewing machine. The timer 21 detects the end of one process by the timer 21, and other switches installed on the sewing machine such as the presser foot position detection switch, thread breakage detection switch, bobbin thread remaining amount detection switch, feed direction detection switch, etc. that detect sewing interruptions. In order to relate to the detection of the end of one process, it can be input as appropriate, and if a hanger system is used as an information source for moving the cloth, the movement position detection switch of this, and each operation in the cloth press work process. The input information source may be a switch or an output signal from a detection controller. 22 is an attached mechanism F (numerals 10, 15 ~
21 etc.) by selecting multiple input signals input from
This is a process end detection condition setting unit for setting detection conditions so that the CPU 11 can detect the end of the process. There are many types of sewing machines, especially industrial sewing machines, and how to use them has become complicated due to the steps of the sewing work process, which are divided among workers. This is because it is not always possible to accurately detect the end of a process. For example, in the case of a process where an overlock sewing machine is used to sew many pieces of the same small piece of cloth, oversewing is performed continuously without stopping the sewing machine, so it is not possible to detect the end of the process just by detecting the number of stitches. . Therefore, when the fabric is detected by the fabric detecting section 15, a predetermined number of stitches are sewn, and the fabric is discharged, it is assumed that one piece of fabric has been hemmed and one process is completed. In this case, the process end detection condition setting section 2
2, it is stored in the RAM 23 so as to determine the end of the process according to the flow shown in FIG. 7 based on each input signal from the cloth detection section 15 and the determination circuit 10. Also,
If there is always a thread cutting operation at the end of the process, based on the input signals of the discrimination circuit 10 and the thread cutting section 16,
Even if there is a slight increase or decrease in the number of stitches at the end of actual sewing, it is possible to accurately determine the end of a process.
Furthermore, input signals from the timer 21 and the pedal switch 20 may be added. Further, in the pattern sewing detector 17 and the program sewing detector 18, the end of the process can be easily detected using a detection switch on each sewing machine mechanism or on software, and the CPU 11 can determine the end of the process from this detection signal. Furthermore, if the sewing work process divided by workers requires multiple sewing machine operations to complete one process,
Alternatively, if one process is completed by using multiple different sewing machines or other mechanical equipment in combination, it is also possible to program the program to detect the process sequentially to follow the flow of each sewing process and determine when the process has ended. be. Reference numeral 24 denotes a work classification means, which determines the work process based on the input signal from the sewing machine attachment mechanism F such as a fabric detection unit, and also distinguishes between the operations performed by the operator while the sewing machine is stopped as shown in Table 1. This is determined based on the output signal from the classification switch 25 pressed by the operator, and the elapsed time and number of operations for each stop operation are calculated by the operation time and number counter 26 and input to the CPU 5.

[Table] Reference numerals 22, 26, 27a, 28, and 29 are setting input sections from the operation panel (not shown) that operate this device, and input may be made from a keyboard, or an IC card or the like that stores each data in advance. Information media may also be used. Reference numeral 26 denotes a process stitch number setting unit for inputting and storing the number of stitches to be sewn in one process in advance so that the determination circuit 10 can determine the end of the process. Reference numeral 27 indicates a predetermined number of stitches for making it possible to compare and check the operation status during one process or for multiple processes collectively according to the number of stitches input in the process stitch number setting section 26 and comparing the operation status with the operation status of another person during the same process. This detecting means includes a predetermined number of stitches setting section 27a which inputs and sets the number of stitches at the time of checking. The predetermined number of stitches is set by calculating the quotient of the number of stitches set in the process stitch number setting section 26 by a divisor N (for example, 2, etc.) or an integer value close to the quotient, and inputting the obtained value to the process stitch number setting section 26. The information may be entered automatically at times. Reference numeral 28 denotes a cumulative unit setting section for inputting a period for cumulative addition in the rotation speed-specific time measuring means 7. As this period, for example, the process end is determined based on the process end detection signal outputted from the process end detecting means 12. This is the period until detection is performed a predetermined number of times. This is because if one process ends in a particularly short time, the data in the time accumulation section 7 by rotation speed may vary and become inaccurate. The aim is to obtain accurate detected values by calculating the average value. Reference numeral 29 denotes a standard work amount setting section, which sets the standard number of operations or classification switch 2 of the attached mechanism F of the sewing machine corresponding to the worker's work process and its work amount.
By inputting in advance the standard working time and number of operations while the sewing machine is stopped, which are output from 5, it is possible to determine that the sewing machine is malfunctioning, for example, if there are abnormally many thread breaks during the operation of the attached mechanism of the sewing machine. An alarm may be sounded as follows. Furthermore, it is possible to compare and analyze the operating status of work with standard work or the work of other workers. 30 and 31 are RAM and ROM connected to CPU5,
32 is a host computer that provides an output signal from the CPU 5, centralizes the data of a plurality of devices connected to a working machine such as a sewing machine, and displays it on a display means (output means) such as a CRT or printer.
33 and can be stored in the storage means 34. Reference numeral 35 denotes an operation recorder (output means), which is connected to the host computer 32 in order to draw an operation graph (see Figs. 5 and 6) showing changes in sewing speed of the sewing machine on the horizontal axis with working time on the recording paper. This allows data from multiple sewing machines to be recorded simultaneously. The operation recorder 35 may be connected to the CPU 5 to serve as a recorder for a small number of sewing machines, and can be installed according to the scale of the device. The operation recorder 35 includes an X-Y recorder, a pen recorder, and other devices capable of graphing the operation status. Next, the operation of this device will be explained. In Figure 2, after initializing the setting section, the setting input section 2
2. Enter predetermined values in 26 to 29 and turn on the operation recorder 35 at S ₁ to _{S 3} . When the main power of sewing machine 1 is turned on and the worker starts sewing, _S4 , the worker presses the foot pedal.
When turned on, the main shaft rotates, and an output signal from the F/V conversion circuit 4 as a sewing speed detection means is obtained, and an operation graph as shown in FIG. 5, for example, is drawn. This operation graph compares the operation status when a veteran worker A and an inexperienced worker B operate the sewing machine equipped with this device. You can tell at a glance that it is fast. The cause of this is that B temporarily stops at points a and b in the graph, and it can also be seen that, as at point c, there is a habit of first pressing the foot pedal slowly and then continuing sewing. . Previously, work instructors were unable to objectively identify the "habits" of workers that caused work delays, but with this device, they can now identify them at a glance, making work guidance more concrete and improving operating rates. This has helped me improve my productivity. Next, the operation status during sewing is graphed and recorded as described above, and the following four types of discrimination are displayed on the graph with working time as the horizontal axis. That is, according to the flowchart shown in FIG. 3 as the operation record routine _S6 , firstly, the output of the work classification means 24 changes and a determination is made when moving to a different work _S7 , and secondly, the predetermined number of stitches detection means 27, determining whether the predetermined number of stitches has been reached S ₈ , thirdly determining whether there is an output from the process end detecting means 12 S ₉ , and fourthly determining whether the cumulative unit setting unit 2
In step _S10 , it is determined whether the number of steps set to 8 has been reached. First, if different tasks are determined, the routine enters S ₇ and a task classification discrimination routine S ₁₁ (see FIG. 4). If the main shaft starts rotating from the sewing machine stop state, the process is not executed (S ₁₂ ), and if the main shaft has stopped rotating (points c and d in Figure 5), the thread breakage detection device, etc. When _the attached mechanism F of the sewing machine is operated, the operation is displayed in S ₁₃ , and the work classification counter S ₁₅ is counted. If attached mechanism F does not operate, S ₁₆ is passed through the delay circuit to distinguish it from stopping the sewing machine due to the stepping during the sewing process shown at point c in Figure 5. Start S ₁₇ or classification switch 25
It is determined whether _S18 has entered the stopped operation after being turned on.
When the classification switch 25 is turned on, as shown in the graph corresponding to the output voltage shown in Table 1 (point e in Figure 6), a negative display is displayed as the sewing machine stop operation display S ₁₉ corresponding to the elapsed work time. With,
Work classification counter S ₁₅ is activated and work standard 29
S ₂₀ For example, if the thread breakage detection signal occurs frequently and there is an abnormally large number of threads being threaded due to thread breakage, the sewing machine is determined to require repair, and an alarm is automatically issued to the administrator in S ₂₁ . , maintenance request
S ₂₂ is made. Managers can prevent a decline in production by making repairs as soon as possible. If the classification switch 25 is not turned on after the cloth replacement time has elapsed, a timer _S23 is activated and an alarm _S24 is automatically output to turn on the classification switch. Note that the graph display of the classification switch 25 is not limited to the negative length as described above, but may also be a display corresponding to the type of the classification switch 25 in the graph or in a blank area of paper apart from the graph. This can be changed in various ways, such as by inputting verbally. By operating the classification switch while the sewing machine is stopped, it is now possible to see what is happening when the sewing machine is not operating. Therefore, this content has made it easier for managers to discover waste and enable them to take effective measures aimed at efficient production. Next, the predetermined number of stitches detecting means 27 determines whether the number of stitches set in the predetermined number of stitches setting section 27a has been reached.
In _S8 , for example, 100 is set in the predetermined stitch number setting section 27a.
is set, each time the stitch count counter 9 increases by 100 stitches after sewing starts, a sign or symbol to that effect is displayed on the operation graph corresponding to the time during the working time (S ₂₆ , Figure 6 f-i
point). Further, cumulative stitch count information from the stitch count counter 9 is transmitted to the host computer 32 and stored, so that the operating status of the sewing machine can be grasped. This has the effect of facilitating comparison with other people's operation graphs when one process is long and the operation graphs are completely different due to differences in sewing skills. Furthermore, by knowing the cumulative number of stitches, the cumulative performance of the worker can be accurately obtained. Next, when there is an output from the process end detection means 12, in _S9 , a sign or symbol to that effect is added to the operation graph corresponding to that time during the working time ( _S28 , No. Figure 6, points j and k). Furthermore, the time interval measured by the elapsed time measurement section 13 during this one process and the cumulative number of sheets from the sheet number counter 14 are displayed in the operation graph as necessary and stored in the host computer 32. With this display, when the operation graph is complex and the end of the process is unknown, the process end classification becomes clear and comparison with other people's operation graphs becomes extremely easy. Furthermore, the cycle time of the sewing process can be accurately determined, and the output can be determined in real time. Next, when it is determined that the number of processes set in the cumulative unit setting section 28 has been reached, in _S10 , an operation graph is displayed for each driving time measured by the rotation speed-specific time measuring means 7 during the elapsed time. A code or symbol, etc. is attached to correspond to the time during the working time.
_S30 . In FIG. 6, the number of steps is set to 1, and the driving time is displayed in three stages: low speed, medium speed, and high speed (FIG. 6 1 to n). By comparing with others based on this determined number, it is possible to objectively analyze and evaluate the sewing skill, which considers a long high-speed drive time to be good from the standpoint of production efficiency. [Effects of the Invention] The present invention has the above-described configuration and operation, and the number of rotations when the sewing machine is driven during sewing is divided into predetermined stages, and the driving time of each is cumulatively added. By comparing with others based on the obtained numbers, it becomes possible to objectively analyze and evaluate the sewing skills of the workers, and also to improve the sewing skills during the sewing process according to the processes that the workers have shared. You can easily find the optimum sewing speed change, so by instructing the work method in that direction,
It is possible to increase production efficiency.

[Brief explanation of drawings]

Figure 1 is a block diagram of this device, Figures 2 to 4 are flowcharts, Figures 5 and 6 are operation graphs recorded by an operation recorder, and Figure 7 is an implementation of a process detection flowchart. This is an example. e...Display of work while stopped, f-i...Display of predetermined number of stitches, j, k...Display of completion of one process, 1-n...Display of sewing time for each rotation speed.

Claims (1)

[Claims] 1. Detecting means 4 for detecting sewing speed in relation to rotation of the sewing machine main shaft; Discriminating means 6 for classifying the sewing speed detected by the detecting means into a plurality of speed ranges; and output means 33 and 35 for outputting the sewing time to the outside in order to utilize the sewing time measured by the measuring means. A sewing management device for a sewing machine, which is characterized by: