JP2014057750A - Lubricant supply period notice device of sewing machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a cheap lubricant supply period notice device of a sewing machine which can notify so as to promote the supply of lubricant with good precision.SOLUTION: A correction value H is calculated from a table 21 based on headway G and maximum speed B calculated every operation of one cycle of a sewing machine 1, and a calibration time J is calculated by multiplying a driving time A by the collection value H. It is determined whether an accumulation time K accumulating the calibration time J has amounted to an allowed time L. When the accumulation time K amounts to the allowed time L, a buzzer 18 and a display 7a of a control panel 7 warn and a motor is stopped.

Description

  The present invention relates to a sewing machine lubricant replenishment time notification device for notifying an operator of a time to replenish a sewing machine lubricant.

  Conventionally, the correction replenishment time with respect to the standard replenishment time is obtained according to the use conditions using the maximum sewing speed, environmental temperature, sewing operation rate, and number of start-ups as parameters, and a notification means every time the total sewing time reaches the correction replenishment time Has disclosed a lubricant replenishment time notification device for a sewing machine (see, for example, Patent Document 1). According to this prior art, every time the power ON count value reaches a predetermined number, the correction replenishment time with respect to the standard replenishment time is obtained by calculation, and the alarm is activated when the total sewing time reaches the correction replenishment time. Then, the user is informed to prompt the user to replenish grease.

Japanese Patent No. 443004 (4th to 9th pages, Fig. 7)

  However, in the sewing machine replenishment time notification device described in Patent Document 1, the correction replenishment time is not recalculated unless the power-on count value reaches a predetermined number. Even when the replenishment time is reached, the notification means may not operate. In other words, if the sewing machine has been operated for a long time under conditions where the actual use condition of the sewing machine is stricter than the standard use condition when the power ON count value has not reached the predetermined number of times, a substantial correction supply time Even if the value has reached, the correction replenishment time obtained most recently is not reached, and therefore the case where the notification means does not operate may occur. In this case, since the sewing machine is operated beyond the time when the grease should be replenished, there is a risk that lubrication of the sliding portion of the sewing machine may occur due to insufficient grease.

  In addition, in the sewing machine replenishment time notification device described in Patent Document 1, the use condition detection means detects four types of use conditions, that is, the actual maximum speed, the actual environment temperature, the actual operation rate, and the actual number of activations. However, there is a problem that a device and control for detecting such information are required, and the device becomes expensive as a sewing machine replenishment time notification device. In addition, grease deteriorates due to metal powder remaining on the sliding part, but the amount of remaining metal powder increases each time grease is replenished, and the progress of deterioration increases accordingly. The replenishment time is gradually shortened. However, in the prior art, the replenishment time is constant, and if grease replenishment is repeated many times, lubrication abnormality due to deterioration cannot be avoided.

  Accordingly, the present invention has been made to solve the above-described problems, and provides an inexpensive sewing machine lubricant replenishment time notification device capable of informing so as to promptly replenish the lubricant. Objective.

In order to achieve the above object, the present invention described in claim 1
In the sewing machine lubricant replenishment time notification device for notifying the time to replenish the lubricant to the sliding portion of the sewing machine,
The driving of the sewing machine and the subsequent stop are regarded as one operation cycle of the sewing machine, and every operation cycle of the sewing machine,
An operation time measuring means for measuring drive time and stop time;
Use condition detecting means for detecting the maximum number of revolutions in one cycle of operation;
Correction time calculation means for calculating the correction time by multiplying the drive time by a correction value obtained from the ratio of the drive time and the stop time measured by the operation time measurement means and the maximum rotational speed detected from the use condition detection means; ,
Accumulated time storage means for accumulating and storing the correction time calculated by the correction time calculation means;
Determination means for determining whether or not the accumulated time stored by the accumulated time storage means has reached a specified time;
Informing means for informing the replenishment of the lubricant when it is determined by the determining means that the accumulated time has reached a specified time;
It is provided with.

Note that the invention described in claim 2
Replenishment frequency storage means for storing the number of times the operation of the notification means was canceled along with the replenishment of the lubricant at the time of notification by the notification means;
A prescribed time update means for updating the prescribed time so that the prescribed time is shortened according to the number of times the notification means is released;
It is provided with.

  According to the present invention, the correction time is calculated for each operation cycle of the sewing machine, and it is determined whether or not the cumulative time obtained by accumulating the correction time has reached the specified time. Can be notified. In addition, there are only two kinds of sewing machine use conditions necessary for calculating the correction time, that is, the ratio between the sewing machine driving time and the stop time and the maximum rotational speed, and these values can be detected by a conventionally known motor ( Therefore, it is possible to provide a relatively inexpensive lubricant replenishment time notification device.

  Further, since the specified time is updated to be shortened according to the number of times the operation of the notifying unit is released with the replenishment of the lubricant at the time of notification by the notifying unit, the replenishment of the lubricant is repeated due to a factor that causes the deterioration of the lubricant. Accordingly, it is possible to make a notification so as to urge the replenishment of the lubricant in accordance with the replenishment time of the lubricant that gradually becomes shorter.

FIG. 6 is a front view of the overlock sewing machine with a front cover removed. It is the schematic of the said sewing machine carrying the lubricant replenishment time alerting device of this invention. It is a block diagram which shows the principal part of the control system of the said sewing machine. It is a figure which shows the principal part of the operation panel of the said sewing machine. It is a flowchart which shows the flow of control of the said sewing machine. It is a table of an experimental result which shows the relationship between the maximum number of rotations of the sewing machine, an operation interval, and grease life.

  Hereinafter, an embodiment in which the present invention is applied to an upper looper mechanism of an overlock sewing machine will be described. As shown in FIG. 1, the sewing machine 1 has an upper looper drive mechanism 2 driven by a main shaft (not shown). In the sewing machine bed 3 of the sewing machine 1, a front cover (not shown) is usually attached to the front surface of the sewing machine bed 3. FIG. 1 shows a state where the front cover is removed and the upper looper drive mechanism 2 appears on the front surface of the sewing machine 1. The upper looper drive mechanism 2 is provided with a grease replenishment portion for the upper looper base indicated by an arrow Z so that an operator manually replenishes the grease replenishment portion Z with grease (corresponding to a lubricant) using a grease tube. It has become.

  As shown in FIG. 2, a sewing machine motor 9 that drives the main shaft and each mechanism connected to the main shaft is connected to the sewing machine 1. A control box 6 for controlling the driving of the sewing machine motor 9 is connected to the sewing machine motor 9, and an operation panel 7 for inputting necessary information to the control box 6 is connected to the control box 6.

  Next, the control system of the sewing machine 1 will be described with reference to FIG. The control box 6 includes an I / O interface 13, a flash ROM 15, a RAM 16, an EEPROM 17, and a CPU 19.

  An operation panel 7, a buzzer 18, a sewing machine motor 9 and the like are electrically connected to the I / O interface 13. The sewing machine motor 9 outputs a rotation signal necessary when the CPU 19 executes the lubricant supply timing notification program. The rotation signal is output as one pulse every time the main shaft of the sewing machine 1 makes one rotation. As shown in FIG. 4, the operation panel 7 is provided with a display unit 7a formed of a liquid crystal display, several types of keys 7b, and a display lamp 7c that is lit whenever a rotation signal is detected.

  The flash ROM 15 stores a lubricant replenishment timing notification program executed by the CPU 19 to notify the timing of replenishing the grease of the sewing machine 1 (hereinafter referred to as a specified time L). Further, the flash ROM 15 stores an upper limit rotational speed C “7000 revolutions / minute”, a continuous upper limit rotational time D “3 seconds”, and a continuous rotational time E “15 seconds” for the sewing machine 1. However, the numerical value described here is a numerical value illustrated for convenience of description of the present embodiment, and can be appropriately changed depending on the type and setting of the sewing machine.

  The RAM 16 forms a memory area for temporarily storing various data required when the CPU 19 executes the lubricant supply time notification program. During the operation of the sewing machine 1, the RAM 16 stores the driving time A and the stopping time F of the sewing machine 1, two kinds of use conditions (maximum rotational speed B, ratio of the driving time A and the stopping time F (hereinafter referred to as an operating interval G and The correction value H obtained from two types of use conditions and the data of the correction time J calculated by multiplying the driving time A of the sewing machine 1 by the correction value H are temporarily stored. In this specification, “rotation speed” refers to the number of times of one driving operation of the sewing machine per unit time, and is synonymous with “sewing speed” in Patent Document 1.

  The EEPROM 17 stores a cumulative value of the correction time J. The EEPROM 17 stores the number of times that the operation of the notifying unit has been canceled due to the replenishment of grease at the time of notification by the notifying unit. Further, the EEPROM 17 stores a grease replenishment timing (specified time L) when the sewing machine 1 is used under standard operating conditions, and the specified time L corresponds to the notification means when the information is supplied by the notification means. It is updated to a specified time L ′ corresponding to the number of times the operation is released. Each data stored in the EEPROM 17 can be electrically rewritten, but the data is retained even when the power is turned off.

  The CPU 19 monitors the grease replenishment time based on the lubricant replenishment time notification program stored in the flash ROM 15, and when the replenishment time is reached, the buzzer 18 sounds and prompts the display unit 7a of the operation panel 7 to replenish the grease. Display for

  Next, the operation of the present invention will be described based on the flowchart of FIG. Symbol Sx (x = 1, 2, 3,...) In the figure indicates each step. The operation time measuring means for measuring the drive time A and the stop time F of the sewing machine 1 is timed in the control box 6.

  When the sewing machine 1 starts to be driven while the power source (not shown) of the sewing machine 1 is on and the control of the lubricant replenishment timing notification device 4 is started (S1: Yes), the drive time A is first cleared (S2). ), The measurement of the driving time A and the maximum rotational speed B is started (S3: corresponding to the operating time measuring means and the use condition detecting means) Next, when the maximum rotation speed B is equal to or higher than the upper limit rotation speed C (S4: Yes), when the drive time A reaches or exceeds the continuous upper limit rotation time D (S5: Yes), a buzzer is used as error processing. 18 and the display section 7a of the operation panel 7 warn and the motor 9 is stopped (S6). After the error processing, when the driving of the sewing machine 1 is started, the control of the lubricant replenishment timing notification device 4 starts again (S1: Yes). Even if the maximum rotation speed B does not reach the upper limit rotation speed C (S4: No), if the drive time A reaches the continuous rotation time E (S7: Yes), the same error processing as described above is performed. (S6). If the drive time A has not reached the continuous rotation time E (S7: No), the determination steps S3 to S8 are repeated while the drive of the sewing machine 1 is continued (S8: No).

  Next, when the sewing machine 1 is stopped (S8: Yes), the stop time F is cleared (S9), and measurement of the stop time F is started (S10: corresponding to the operation time measuring means). Next, when the driving of the sewing machine 1 is not started and the stop time F is less than the drive time A (S11: No), S10 and S11 are repeatedly executed, and the stop time F is measured each time. When the driving of the sewing machine 1 is started or when the stop time F reaches the drive time A (S11: Yes), the operation interval G is obtained as a value obtained by dividing the drive time A by the stop time F ( S12).

  Based on the maximum rotational speed B and the operation interval G obtained as described above, a correction value H is obtained from a table 21 of FIG. 6 to be described later (S13), and the drive time A is multiplied by the correction value H to obtain a correction time J (S14: equivalent to correction time calculation means). Next, the accumulated time K is obtained by accumulating the correction time J calculated in the process of one cycle with the driving and subsequent stop of the sewing machine 1 as one cycle (S15: corresponding to accumulated time storage means). .

  Next, the determination means will be described. When the accumulated time K thus obtained has not reached the specified time L (S16: No), S1 to S16 are repeatedly executed. When the accumulated time K reaches the specified time L (S16: Yes), a warning is given by the buzzer 18 and the display unit 7a of the operation panel 7 and the motor is stopped (S17: corresponding to notification means). The notification means is temporarily released by pressing any of the keys 7b on the operation panel 7. In this case, the notification means is executed every time the sewing machine 1 is turned on next time.

  In the grease replenishment section Z notified of the grease replenishment timing by the notification means, after replenishing the grease, all the keys 7b of the operation panel 7 are pressed at once to initialize various data of the lubricant replenishment timing notification device 4. If (18: Yes), the execution of the notification means is canceled. Then, in the display section 7a of the operation panel 7 shown in FIG. 4, 1 is added to the numerical value of the grease replenishment count 20 (corresponding to the replenishment count storage means). It is updated to the multiplied prescribed time L ′ (S19: corresponding to prescribed time updating means). Next time, when the control of the lubricant replenishment time notification device 4 is started, this L ′ is applied as the value of the specified time L. Y can be changed depending on conditions as long as Y is a value smaller than 1. In addition, since the specified time L is updated by multiplying Y every time grease is supplied, the specified time L is gradually shortened every time grease supply is repeated.

Next, the table 21 for obtaining the correction value H will be described with reference to FIG. The table 21 shows the ratio of the drive time to the stop time (= G) in one cycle of the sewing machine described above (= G), and the time required for replenishment due to depletion or deterioration of the grease replenished to the grease replenishment section Z (grease The life T) is plotted on the vertical axis. R is a curve showing the correlation between the operation interval G and the grease life T when the sewing machine is driven at a certain rotation speed (sewing speed), R1 is the recommended rotation speed r1, and R2 is the safety factor. The rotational speeds r2 and R3 that define the upper limit including the above are curves showing the above correlation at the upper rotational speed r3 (= C). For the rotational speeds r1, r2, and r3, the magnitude of r1 <r2 <r3 There is a relationship. The table 21 is divided into a plurality of areas a to j based on the correlation between the operation interval G and the grease life T described above, that is, the curve R, and correction values H1 to H9 are respectively assigned to the areas a to i. The area “j” is assigned information of “Driving impossible”. As the correction value H, a larger value is assigned to an area located further to the right and below.
The area classification in this table 21 and the correction value H assigned to each area vary depending on various conditions such as the type of sewing machine, and a table corresponding to the various conditions is applied.

Next, a method for extracting the correction value H in one cycle of the sewing machine operation will be described. As described above, based on the maximum rotation speed B and the operation interval G in one operation cycle obtained up to step S12 shown in FIG. 5, in step S13, in the operation interval G on the curve R corresponding to the maximum rotation speed B. It is determined to which area a to j the position belongs, and the correction value H assigned to this area is extracted.
For example, when the maximum rotation speed B in one cycle of operation is the upper limit rotation speed r3 and the operation interval G is “1.5”, the curve R3 corresponding to the upper limit rotation speed r3 is applied, and the operation interval G is 1. 5, the position on the curve R3 is a point P1 shown in FIG. 5, and the correction value H8 assigned to the area h to which the point P1 belongs is extracted. Similarly, when the maximum rotation speed B is the upper limit rotation speed r3 and the operation interval G is “3.0”, information of “impossible operation” assigned to the area j to which the point P2 belongs is extracted, and step S6. Error handling is performed.
Further, when the maximum rotation speed B does not correspond to the rotation speeds r1, r2, and r3, a curve R that is greater than the maximum rotation speed B and corresponds to the latest rotation speed among the rotation speeds r1, r2, and r3 is applied. When the maximum rotational speed B is larger than the rotational speed r3, the sewing machine motor 9 is stopped separately by control on the sewing machine motor 9 side.
Furthermore, when the position on the table 21 determined by the maximum rotational speed B and the operation interval G is located on the boundary between the areas, for example, the point P3 is located on the boundary between the three areas a, b, and d. In this case, the minimum correction value in the corresponding area, that is, the correction value H1 assigned to the left area and the upper area, that is, the area a is extracted in this embodiment.

  As described above, according to the present invention, the correction time J is calculated for each operation cycle of the sewing machine 1, and it is determined whether or not the cumulative time K obtained by accumulating the correction time J has reached the specified time L. It is possible to make a notification so as to promptly replenish grease. Further, since there are only two types of use conditions of the sewing machine 1 necessary for calculating the correction time J, that is, the operation interval G and the maximum rotation speed B, the grease replenishment timing notification device of the present invention is relatively inexpensive. Further, since the specified time L is updated so as to be shortened in accordance with the number of times the operation of the notifying unit is released when the notifying unit is replenished at the time of notification by the notifying unit, the lubricant replenishment timing gradually decreases as the grease deteriorates. It is possible to make a notification so as to prompt the user to replenish the lubricant.

  Although the present invention has been specifically described above based on the embodiments, the present invention is not limited to the above embodiments, and various modifications can be made without departing from the spirit of the present invention.

For example, in the above-described embodiment, the case where the present invention is replenished with the grease of the sewing machine has been described as an example. However, the present invention is not limited to the grease and can be applied to a lubricating oil of a sewing machine having a lower viscosity.

  Further, the upper looper base of the upper looper driving mechanism has been described as an example of the grease replenishment unit, but the present invention is not limited to this, and any machine sliding unit such as a needle bar can be applied. Further, although a warning is given by a buzzer and a liquid crystal display as a notification means, a warning may be issued by lighting a lamp if it is possible to issue a warning prompting replenishment of grease.

DESCRIPTION OF SYMBOLS 1 Sewing machine 2 Upper looper drive mechanism 3 Sewing machine bed 4 Lubricant replenishment time alert device 6 Control box 7 Operation panel 7a Display part 7b Keys 7c Display lamp 9 Sewing motor 13 I / O interface 15 Flash ROM
16 RAM
17 EEPROM
18 Buzzer 19 CPU
20 Grease replenishment times 21 Table Z Grease replenishment section

Claims (2)

In the sewing machine lubricant replenishment time notification device for notifying the time to replenish the lubricant to the sliding portion of the sewing machine,
The driving of the sewing machine and the subsequent stop are regarded as one operation cycle of the sewing machine, and every operation cycle of the sewing machine,
An operation time measuring means for measuring drive time and stop time;
Use condition detecting means for detecting the maximum number of revolutions in one cycle of operation;
Correction time calculation means for calculating the correction time by multiplying the drive time by a correction value obtained from the ratio of the drive time and the stop time measured by the operation time measurement means and the maximum rotational speed detected from the use condition detection means; ,
Accumulated time storage means for accumulating and storing the correction time calculated by the correction time calculation means;
Determination means for determining whether or not the accumulated time stored by the accumulated time storage means has reached a specified time;
Informing means for informing the replenishment of the lubricant when it is determined by the determining means that the accumulated time has reached a specified time;
A lubricant replenishment time notification device for a sewing machine, comprising: Replenishment frequency storage means for storing the number of times the operation of the notification means was canceled along with the replenishment of the lubricant at the time of notification by the notification means;
A prescribed time update means for updating the prescribed time so that the prescribed time is shortened according to the number of times the notification means is released;
A lubricant replenishment time notification device for a sewing machine, comprising:

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