JPH08173672A - Thread-on-the-bobbin control unit - Google Patents

Abstract

PURPOSE: To minimize the amount of thread to be left unused on a bobbin not only in ordinary machines but also in those with the sewing pitch inconsistent during one sewing job by winding on the bobbin the amount actually consumed as the amount to be used for the next job. CONSTITUTION: In a thread-on-the-bobbin control unit 55, the thread left unused on a bobbin is removed by a leftover thread removing unit 41, the amount left unused is determined by a reflection type optical sensor 44 and a 1/8 counter 46, and the amount for the next job is calculated by a calculator 64 using the amount remaining on the bobbin and the amount that had been mounted on the bobbin. A bobbin thread winder control 60 then drives a bobbin thread winder 40 using the calculated amounts. When the amount wound on the bobbin coincides with the amount to be needed for the next sewing, the bobbin thread winder 40 is stopped, and then the actually consumed amount is wound on a bobbin 7 as the amount to be required by the next sewing process.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a device for automatically controlling the amount of bobbin thread wound on a bobbin.

[0002]

2. Description of the Related Art In a sewing machine for sewing using an upper thread and a lower thread, particularly for an industrial sewing machine that performs high-speed sewing work, it is necessary to frequently replace a bobbin wound with a lower thread. is there. Generally, when the bobbin thread is consumed, the sewing machine operation is temporarily stopped, the bobbin case is removed from the hook, the bobbin thread is wound around the bobbin, and the bobbin on which this bobbin thread is newly wound is placed in the bobbin case. A series of operations for accommodating and mounting the bobbin case in the shuttle are performed manually.

[0003]

However, the manual operation of winding the bobbin around the bobbin and the replacement operation of the bobbin case are extremely inefficient and cause a decrease in productivity.

Therefore, the present applicant has attempted to solve the above problems in Japanese Patent Application No. 5-239194 filed earlier.

The outline configuration of the bobbin thread automatic feeding device described in Japanese Patent Application No. 5-239194 is a bobbin thread winding device (bobbin thread winding device) for automatically winding a bobbin thread around a bobbin, and a bobbin in a shuttle. The bobbin case that accommodates the bobbin case is replaced with a bobbin changing device that replaces the bobbin case that has already wound the bobbin with the bobbin thread winding means, and the bobbin winding amount required for the bobbin is calculated in advance according to the sewing conditions. Bobbin winding amount control means for activating the bobbin thread winding means until the bobbin winding amount is substantially matched. And
According to the input sewing conditions such as the number of times of sewing, the thread consumption amount for each sewing, the thread type, and the thread count, the bobbin thread winding amount control means preliminarily sets 2 stitches for the first bobbin as 2 stitches, for example, for the second bobbin. 2 stitches for 2m, for example, 1m for the third bobbin (first bobbin),
Thus, the bobbin winding amount is calculated in advance and only the amount required for sewing is automatically wound around the bobbin.
Also, for example, if the sewing length has changed (becomes too long), the lower thread will not be insufficient for the next sewing.
The bobbin thread remaining amount in the bobbin for each sewing (bottom thread winding amount) −
It is also calculated by (pitch x number of stitches), and the bobbin is replaced when the bobbin thread remaining amount is low.

However, the above-mentioned Japanese Patent Application No. 5-23919.
The automatic bobbin thread feeder described in Japanese Patent No. 4 has the following problems. That is, since the remaining amount of the bobbin thread is calculated by (the bobbin thread winding amount)-(pitch x number of stitches) as described above,
(1) In a sewing machine in which the sewing pitch during sewing does not become constant but changes, the remaining amount of the bobbin thread cannot be accurately grasped, and therefore the remaining amount of the bobbin thread increases or, in some cases, the bobbin thread remains. There is a problem that there is not enough.

Even if the bobbin thread winding length is to be accurately determined, the number of sewing operations, the thread consumption amount for each sewing operation, the thread type, the thread count, etc. must all be entered as input elements. However, since there are many input items, there is a problem that the operation becomes complicated, and there is also a problem that an item that may be changed, such as the number of times of sewing, cannot be changed.

Therefore, according to the present invention, the actual bobbin thread consumption amount is wound around the bobbin as the bobbin thread amount required for the next sewing, so that not only the normal sewing machine but the sewing pitch during one sewing is not constant. It is possible to provide a bobbin bobbin thread winding amount control device that can minimize the amount of bobbin bobbin thread left unused even for a sewing machine that changes without changing, and that does not require preset sewing times. The first purpose.

Further, in addition to the above first object, the present invention provides a bobbin which is required before the actual bobbin thread consumption amount is set to the bobbin thread amount required for the next sewing and when the sewing pattern is changed. A second object of the present invention is to provide a bobbin bobbin winding amount control device capable of simplifying input setting of the bobbin winding amount and improving operability.

A third object of the present invention is to provide a bobbin bobbin winding amount control device capable of grasping an actual bobbin thread consumption amount with a small error and improving reliability.

[0011]

In order to achieve the first object, the bobbin bobbin winding amount control device according to claim 1 is provided with:
A bobbin winding device that winds a bobbin around the bobbin by rotating the bobbin, a bobbin winding device control means that controls driving and stopping of the bobbin winding device, and a bobbin wound by the bobbin winding device. A bobbin thread amount detecting means for detecting the bobbin thread amount to be rotated, and a bobbin thread consumption amount of the bobbin consumed in sewing with the sewing machine are detected, and the bobbin thread consumption amount is used as a bobbin thread amount required for the next sewing. And a bobbin thread consumption amount detecting means for sending the bobbin to the bobbin winding device control means.

Further, in order to achieve the first object,
A bobbin winding amount control device of a bobbin according to a second aspect is the bobbin winding amount control device according to the first aspect, wherein the bobbin consumption detecting means removes the residual yarn of the bobbin and the bobbin by the residual yarn removing device. Residual thread amount detecting means for detecting the residual thread amount taken out from the
Based on the lower thread amount detected by the lower thread amount detecting means and the remaining thread amount detected by the remaining thread amount detecting means, the lower thread amount necessary for the next sewing is calculated, and at the same time, necessary for the next sewing. The lower thread amount is sent to the lower thread winding device control means so as to be wound on the bobbin.

In order to achieve the second object,
A bobbin bobbin winding amount control device according to a third aspect is, in addition to the first or second aspect, a bobbin amount setting means for setting a bobbin amount to be wound on the bobbin by the bobbin winding device, and a lower thread amount setting means. Switching means for switching the bobbin thread setting amount set by the thread amount setting means and the bobbin thread amount necessary for the next sewing and sending it to the bobbin thread winding device control means is provided.

Further, in order to achieve the third object,
A bobbin bobbin winding amount control device according to a fourth aspect of the present invention is a bobbin bobbin thread winding amount control device for removing a bobbin residual yarn removal device, and a residual yarn amount detection means for detecting an amount of residual yarn taken out from the bobbin by the residual yarn removal device. Setting means for setting the amount of yarn wound around the bobbin based on the amount of remaining yarn detected by the remaining yarn amount detecting means.

[0015]

According to the bobbin bobbin thread winding amount control device of the first aspect, the bobbin bobbin thread consumption amount consumed by the sewing machine is detected by the bobbin thread consumption amount detecting means, and the bobbin thread consumption amount is detected. The consumption amount is sent to the bobbin thread winding device control means so that the bobbin is wound around the bobbin as the bobbin thread amount necessary for the next sewing, and the bobbin thread winding device control means drives the bobbin thread winding device. The bobbin thread amount wound on the bobbin is detected by the bobbin thread amount detection means, and when the bobbin thread amount wound on the bobbin matches the bobbin thread amount required for the next sewing, the bobbin thread winding device control means The driving of the thread winding device is stopped, and the actual bobbin thread consumption amount is wound on the bobbin as the bobbin thread amount required for the next sewing.

According to the bobbin bobbin winding amount control device of the present invention, the residual yarn removing device removes the residual yarn amount of the bobbin. The residual yarn amount is detected by the residual yarn amount detecting means. The amount of lower thread required for the next sewing is calculated by the calculating means based on the remaining amount of thread and the amount of lower thread wound around the bobbin, and the amount of lower thread required for the next sewing is determined by the lower thread winding device. It is sent to the control means.

According to the bobbin bobbin thread winding amount control device of the third aspect, the bobbin thread winding amount is set by the bobbin amount setting means, and the bobbin winding amount is set by the switching means. The amount of bobbin thread required for the next sewing can be switched, but only the minimum required for setting the bobbin thread winding length roughly, such as the thread count and winding length, are input items by the bobbin thread amount setting means. For example, before setting the actual bobbin thread consumption amount to the bobbin thread amount required for the next sewing or when changing the sewing pattern, this bobbin thread setting amount can be switched to the bobbin thread amount required for the next sewing. In this case, the input setting after switching is unnecessary and the input setting at the time of setting is simplified.

According to the bobbin bobbin winding amount control device of the present invention, the residual yarn removing device removes the residual yarn of the bobbin. The residual yarn amount is detected by the residual yarn amount detecting means. The amount of yarn wound around the bobbin is set by the setting means based on the remaining yarn amount. Here, in the case of detecting the lower thread consumption amount from the rotation speed of the bobbin arranged in the shuttle during the sewing machine operation, since the winding diameter of the thread greatly changes from large to small, one bobbin rotation is actually performed. The difference in the bobbin thread consumption between the large diameter and the small diameter is large, but in the case of obtaining the bobbin thread consumption by detecting the residual thread of the bobbin, the state in which the winding diameter of the thread is reduced Since it can be detected by, the error is reduced.

[0019]

Embodiments of the present invention will now be described in detail with reference to the drawings. First, with reference to FIGS. 10 to 14, an outline of an automatic bobbin thread feeding device to which the bobbin bobbin winding amount control device of the present invention is applied will be described.

This automatic bobbin thread feeder is provided in the sewing machine bed 1.
Is placed in the space where the bottom below is an oil reservoir,
As shown in FIGS. 10 and 14, the bobbin case attaching / detaching position A, the residual thread removing position B, and the bobbin thread winding position C are arranged at 120 ° intervals around one axis, and FIGS.
As shown in FIG. 3, the bobbin case attachment / detachment position A and the other work positions B and C are separated on both ends of the uniaxial shaft, and the column 2 is erected in the space and is mounted on the column 2. A main base 3, a guide shaft 4 that is one shaft that is horizontally supported by the main base 3, and a rotating arm 5 that is supported together with the guide shaft 4 so as to be rotatable and axially slidable. It is composed of a forward / backward lever 6 for moving the rotary arm 5 forward and backward along the guide shaft 4, and a drive device for rotating the rotary arm 5 forward or backward in units of 60 °.

As shown in FIG. 14, the guide shaft 4 is rotatably supported by the standing portion of the main base 3 at both ends. As shown in FIG. 13, its cross section is non-circular, and the shape of the hole of the corresponding boss 5a of the rotating arm 5 is also the same. Therefore, the rotating arm 5 can slide along the guide shaft 4 and can rotate together with the guide shaft 4.

As shown in FIGS. 10 and 14, the rotating arm 5 extends symmetrically from the center to both sides with a slight bending, and the bobbin 7 is provided near each end as shown in FIG. A bobbin case 8 having a built-in is detachably supported.
As a bobbin attaching / detaching mechanism which is a bobbin case gripping means in the rotating arm 5, for example, Japanese Patent Laid-Open No. 5-192476.
For example, a pair of electromagnet suction heads described in the bobbin changing device of the sewing machine and the bobbin exchanging device of the sewing machine in Japanese Patent Application No. 5-121960 previously filed by the present applicant. Japanese Patent Application No. 5-1163 filed previously by
Appropriate ones such as those with lever claws described in the bobbin changing device of the sewing machine in the specification No. 63 can be adopted. In short, the bobbin case 8 can be used with respect to the facing member (for example, the hook 16) as necessary. It can be attached and detached.

As shown in FIGS. 10 and 11, the forward-reverse lever 6 is rotatably supported by a shaft 9 provided upright on the main base 3. A long hole 6a is formed near the free end. The other end is rotatably attached to a shaft 13 fixed to a knuckle 12 at the rod tip of an air cylinder 11 attached to the main base 3 by a support plate 10. Then, as shown in FIGS. 12 and 13, the rotation arm 5 is inserted into the long hole 6a of the forward / backward movement lever 6.
Of the collar 14 rotatably attached to the boss 5a of
A pin 15 protruding from the surface is engaged. Therefore, when the rod of the air cylinder 11 expands and contracts, the forward-backward movement lever 6 moves forward and backward about the shaft 9. Accordingly, the rotating arm 5 moves forward and backward along the guide shaft 4 via the pin 15 that engages with the long hole 6a of the forward-reverse lever 6.
That is, the rotating arm 5 is the same as the rotary hook 1 shown in FIGS.
The bobbin case attachment / detachment position A side, which is the sewing position where 6 is provided, and the opposite side (there is the residual thread removing position B and the bobbin thread winding position C) can be moved forward and backward along the guide shaft 4. it can.

The rotary drive device for the rotary arm 5 is shown in FIG.
As shown in FIG. 11, a motor 19 attached to a bracket 18 fixed to a bracket 17 below the main base 3, and a gear 21 fixed to a rotating shaft 20 thereof.
And a gear wheel 22 rotatably supported by the bracket 17 and meshing with the gear wheel 21, an original wheel 23 fixed to one surface of the gear wheel 22, a pin 24, and a driven wheel 25 rotatably supported by the bracket 17. The mechanism, the gear 26 coaxially fixed to the driven wheel 25, and the guide shaft 4 are fixed (see FIG.
2) a gear 27 that meshes with the gear 26. Therefore, by configuring the gear 26 and the gear 27 with a predetermined gear ratio, the rotating arm 5 is rotated by the Geneva mechanism of the rotary drive device by the motor 19 as a drive source in units of 60 ° via the guide shaft 4. .

As described above, the bobbin case holding means capable of holding and releasing the bobbin case 8 and the rotating arm 5 capable of rotating the bobbin case holding means with the guide shaft 4 as a fulcrum and sliding in the axial direction. As shown in FIG. 1, a driver 49 is connected to the motor 19 of the bobbin exchanging device 42 as a moving means.
Are driven by the driver 49. A solenoid valve 50 is connected to the air cylinder 11, and the drive of the solenoid valve 50 is controlled by the solenoid valve 50. That is, in the bobbin exchanging device 42 as described above, the rotation of the motor 19 causes the rotating arm 5 to repeat forward / backward movement in units of 60 ° and to move forward / backward along the guide shaft 4, thereby causing the bobbin case 8 to move. Is reliably transported to each work position A, B, C, and the work is executed or received.

At the bobbin winding position C, the bobbin winding device 40 is provided.
Is provided. As shown in FIG. 1, the bobbin winding device 40 may be any device that can automatically wind the bobbin from the bobbin 30 around the bobbin 7 in the bobbin case 8 by driving the motor M1 or the like. It may be of any type, for example, an automatic bobbin thread feeder of Japanese Unexamined Patent Publication No. 5-192476 or Japanese Patent Application No. 5-12 previously filed by the applicant.
1960 Specification of bobbin exchanging device for sewing machine and Japanese Patent Application No. 5
Appropriate ones can be adopted, including the bobbin winding device described in the bobbin changing device of the sewing machine of the specification No. 116363. In the bobbin winding device 40, the bobbin wound around the bobbin 7 is automatically threaded into the bobbin case 8 as described in Japanese Patent Laid-Open No. 5-192476. The bobbin thread that has been threaded and threaded out from the bobbin case 8 can be automatically cut. The driver 4 is attached to the motor M1.
7 is connected, and the motor M1 is driven by the driver 47.

At the residual yarn removing position B, a residual yarn removing device 41 is arranged. The residual thread removing device 41 has, for example, a pinching member that can pinch or release the tip of the thread wound on the bobbin, and rotates around an axis by, for example, driving the motor M2 (see FIG. 1). Therefore, any bobbin thread sandwiched by the sandwiching member can be automatically wound up, for example, Japanese Patent Application No. 5-203610 previously filed by the present applicant. Appropriate ones can be adopted including the bobbin residual yarn removing device described in the specification and Japanese Patent Application No. 6-40351. A driver 48 is connected to the motor M2, and the motor M2 is driven by the driver 48.

The lower yarn winding device 40 and the residual yarn removing device 4
As shown in FIG. 1, for example, reflection type optical sensors 43 and 44, which are rotation detecting means, are attached to the unit 1. These reflection type optical sensors 43 and 44 are respectively arranged on the open end side of the bobbin case 8 so as to face a plurality of holes 7a formed in an annular shape on the side surface of the bobbin 7 as shown in FIG. Are arranged respectively. Then, 1/8 counters 45 and 46 are connected to the reflection type optical sensors 43 and 44, respectively.

Therefore, when the bobbin 7 rotates, the reflection type photosensors 43 and 44 output continuous pulse waves as shown in FIG. 4, and these pulse waves are output by the 1/8 counters 45 and 46. Counted. Where bobbin 7
Since eight holes 7a are formed in the bobbin 7,
When rotating and counting eight pulse waves by the 1/8 counter, the count number becomes 1. That is, the reflective optical sensor 4
From the output of the ⅛ counter 45 connected to No. 3, the number of rotations of the bobbin around the bobbin 7 (the amount of bobbin winding) can be known. Further, when the bobbin is removed from the bobbin 7, the rotation of the bobbin 7 stops, so that the reflection type optical sensor 4
From the output of the 1/8 counter 46 connected to No. 4, the number of revolutions of the bobbin 7 at the time of removing the residual yarn (remaining yarn removal amount) can be known.

An operation panel 52 is attached to the bobbin thread automatic feeder (see FIG. 1). The operation panel 52 has a power switch 52 as shown in FIG.
a, an operation switch 52b, and a setting switch 52c as a bobbin thread amount setting means. Power switch 52a
Is for turning on and off the main power supply. The operation switch 52b automatically starts the bobbin thread automatic feeding device after turning on the main power source, manually starts the bobbin thread automatic feeding device when this automatic start is not performed, or manually when the bobbin thread automatic feeding device operates. The automatic bobbin thread feeder is stopped, and it also has a function of inputting a switching signal to the switching means 63 described later. The setting switch 52c is composed of a dip switch, a cord switch, etc., and the yarn count and the yarn winding length can be input by these. Among these, with respect to the setting of the yarn winding length, a rough and large value can be set (details will be described later).

The drivers 47, 48, 49 and the solenoid valve 5
0, 1/8 counters 45, 46, power switch 52a,
As shown in FIGS. 1 and 2, a lower thread automatic feeder control means (CPU) 55 is connected to the operation switch 52b, the setting switch 52c and the sewing machine main body 51.

As shown in FIG. 2, the automatic bobbin thread feeder control means 55 monitors the bobbin rotation speed (corresponding to the bobbin thread winding length) at the time of bobbin winding from the 1/8 counter 45. A lower thread winding device control means 60 for sending a signal for controlling driving / stopping of the lower thread winding device 40 to the driver 47;
Control of residual thread removing device that sends a signal for controlling driving / stopping of the residual thread removing device 41 to the driver 48 while monitoring the bobbin rotation speed (corresponding to the residual thread length) from the / 8 counter 46 when removing the residual thread. Bobbin rotation speed (corresponding to the bobbin winding length) at the time of bobbin winding from the means 62 and the 1/8 counter 45 and 1 /
Based on the bobbin rotation speed (corresponding to the residual thread length) at the time of removing the residual thread from the 8-counter 46, the calculation of (bobbin rotation speed at the time of bobbin winding)-(bobbin rotation speed at the time of residual thread removal) is performed. This calculates the amount of bobbin thread required for the next sewing (actual bobbin thread consumption at this time; bobbin rotation number at the time of bobbin winding next time), and the amount of bobbin thread required for this next sewing (next time Arithmetic means 6 for sending the bobbin rotation speed at the time of bobbin winding) as a signal to the bobbin winding device control means 60 so as to wind the bobbin.
4 and 4 are provided.

The bobbin thread automatic feeding device control means 55 further includes a rotation speed conversion means 65 for converting the set thread winding length into a bobbin rotation speed according to an input from the setting switch 52c. A switching means 63 is provided for switching between the set rotational speed and the bobbin rotational speed at the time of the next bobbin winding, and sending it to the bobbin winding device control means 60. The switching by the switching means 63 is performed by, for example, the power switch 52.
a, according to the input from the operation switch 52b.
That is, when the power switch 52a is turned on, the actual sewing has not been performed yet and the bobbin rotation speed at the time of the next bobbin winding is not calculated. Therefore, the lower thread setting rotation speed is sent to the lower thread winding device control means 60. Is changed so that However,
A signal from the lower thread winding device control means 60 switches the second or third bobbin so that the bobbin rotation speed at the time of the next lower thread winding is sent to the lower thread winding device control means 60 ( See below for details). Similarly, when the sewing pattern is changed by the operation switch 52b, the lower thread setting rotational speed is switched to the lower thread winding device control means 60.

Furthermore, the lower thread automatic feeder control means 5
5 is a bobbin exchanging device control means 61 for sending a signal for controlling driving / stopping of the bobbin exchanging device to the driver 49 and the solenoid valve 50, a power switch 52a, and an operation switch 52
sewing machine control means 66 for controlling the sewing machine main body 51 according to an input signal from b (for example, sending an operation prohibition / permission signal and receiving a sewing end signal).

The automatic bobbin thread feeder control means 55 includes:
R that stores processing procedures in the form of programs and fixed data
An OM 53 and a RAM 54 for temporarily storing data used for calculation and calculation results are connected. FIG. 5 is a flow chart showing the program written in the ROM 53.
Through FIG. 9.

The operation of this apparatus will be described below according to the program. When the program starts and first the power switch 52a is turned on, in step 1, an operation prohibition command is issued to the sewing machine main body 51. This is to prevent the sewing machine from operating by accidentally stepping on the pedal when the bobbin case 8 is taken out from the shuttle 16. Next, in step 2, the bobbin thread automatic feeder is initialized. Here, the current state (the state when the power switch 52a was turned off last time) is detected, and if the bobbin case 8 is in the shuttle 16, the bobbin case 8 is taken out from the shuttle 16 and then left. If the thread is removed, or if the bobbin thread is being wound, cut the bobbin thread,
After that, the residual yarn is removed. That is, the bobbin case 8 is in a state in which the lower thread is not wound. These bobbin cases 8
The attaching / detaching operation of the bobbin 16, the bobbin winding operation, and the residual thread removing operation will be described later. Further, the connection of the automatic bobbin thread feeder control means 55 is set by the switching means 63 by the setting switch 52.
Switch to c side.

Then, in step 3, in step 3, the rotating arm 5 of the bobbin exchanging device 42 is rotated to make the gripped bobbin case stand by at the standby position.
This standby position may be anywhere, but in the present embodiment, for example, the bobbin gripped at one end of the rotary arm 5 waits at a position D (see FIG. 10) intermediate between A and B. To For convenience of explanation, a position D intermediate between A and B
The bobbin that is waiting for is bobbin X, and the other bobbin is bobbin Y. At this time, the entire automatic bobbin thread feeder is also in a standby state. Next, in step 4, it is determined in step 4 whether or not the automatic start mode for automatically starting the bobbin thread automatic feeder after power-on is selected. This automatic start mode is a mode selected by turning on the automatic start switch of the operation switch 52b, and is selected as it is every time the power is turned on. The automatic start mode is released when the automatic start switch is turned off. If the automatic start mode is not selected, the process proceeds to step 5, and in step 5, it is determined whether or not the manual start switch for manually starting the lower thread automatic feeder is turned on, and the switch is turned on. If not, step 5a
Then, in step 5a, a signal for permitting the sewing machine operation is sent to the sewing machine main body 51, the process returns to step 5, and the same operation is repeated until the manual start switch is turned on. Therefore, in this standby state,
The operator will manually change the bobbin and perform sewing. On the other hand, if it is determined in step 5 that the manual start switch is turned on, the process proceeds to step 5b, and in step 5b, a signal for prohibiting the sewing machine operation is sent to the sewing machine main body 51 and the process proceeds to step 6.

Also, when it is determined in step 4 that the automatic start mode is selected, the process proceeds to step 6, in which the yarn count and the yarn winding length Lm input from the setting switch 52c are read and step 7 is performed. In step 7, the set yarn winding length Lm is converted into the bobbin rotation speed. That is, the number of rotations Rm, which is the number of rotations of the bobbin for winding the yarn winding length Lm around the bobbin, is calculated. In addition,
Rm and Lm are not directly proportional to each other, and also depend on the yarn count.
Is obtained as a parameter, this data table is stored in the RAM 54, and conversion is performed based on this data table.

Then, the process proceeds to step 8, and in step 8, one bobbin X is conveyed to the bobbin winding position C and the process proceeds to step 9. In step 9, the bobbin X is wound on the bobbin X.

FIG. 8 shows the procedure of the winding operation in detail. First, in step 1, the motor M1 is driven to start winding the bobbin thread around the bobbin X. The number of rotations (count of rotations) RM of the bobbin X is detected by the reflection type optical sensor 43 and the 1/8 counter 43 as the lower thread amount detecting means. Next, in step 2, it is determined whether or not the rotation speed RM of the bobbin X has reached the rotation speed Rm. If not, the same determination is repeated until the rotation speed RM is reached. Go to step 3. That is, the yarn winding length Lm input from the setting switch 52c is wound around the bobbin X.

Then, in step 3, the motor M1
Of the bobbin X is automatically hooked on the bobbin case 8, and the bobbin thread that is threaded and is pulled out from the bobbin case 8 is stopped. The cutting is performed automatically, and the flow of the winding process shown in FIG. 8 ends.

Then, the process proceeds to step 10 of the main flow shown in FIG. 5, and in step 10, the rotating arm 5 is rotated clockwise by 120 ° in FIG. 10 and is advanced to the shuttle side in FIG. 14 to attach / detach the bobbin case. By the mechanism, the bobbin X is mounted in the shuttle and the process proceeds to step 11. In step 11, the operation of the sewing machine main body 51 is permitted. That is, the sewing becomes possible and the sewing is started.

Then, the process proceeds to step 12, step 1
2, while the bobbin X in the hook is being sewn, the rotary arm 5 is retracted and the clockwise arm 6 in FIG.
The bobbin Y is rotated by 0 °, the other bobbin Y is conveyed to the bobbin winding position C, and the process proceeds to step 13. In step 13, the bobbin Y is wound with the bobbin. The bobbin winding operation on the bobbin Y is performed according to the flow shown in FIG. 8, as with the bobbin X. The yarn winding length at this time is Lm as in the bobbin X.

In this way, when the bobbin Y is wound around the bobbin Y, the process proceeds to step 14, and in step 14, it is judged whether or not the sewing on the bobbin X is completed, for example, by a thread trimming signal of the sewing machine 51 or the like. If the bobbin X has not been sewn, the same determination is repeated until the bobbin X is finished. If the bobbin X has been sewn, the process proceeds to step 15. In step 15, the sewing machine operation is prohibited and the process proceeds to step 16. Proceeding to step 16, the rotary arm 5 is rotated 60 ° counterclockwise in FIG.
While rotating, it is advanced to the shuttle side in FIG. 14, and the bobbin case attaching / detaching mechanism holds the bobbin X with the residual thread in the shuttle at one end of the rotary arm 5 and the rotary arm 5 to the guide shaft 4.
And the bobbin X is taken out from the shuttle.

Then, the process proceeds to step 17, step 1
In 7, it is determined whether or not a manual stop switch for manually stopping the automatic bobbin thread feeder is turned on. If the manual stop switch is turned on, the process proceeds to step 18, and in step 18, the sewing machine A signal for permitting the sewing machine operation is sent to the main body 51, the process returns to step 17, and the same operation is repeated until the manual stop switch is cleared. Therefore, in this standby state, the operator manually attaches the bobbin wound with the lower thread to the hook and performs sewing. On the other hand, when it is determined in step 17 that the manual stop switch is not turned on,
Proceeding to step 17a, in step 17a, a signal for prohibiting the sewing machine operation is sent again to the sewing machine main body 51, and the process proceeds to step 19. In step 19, the rotating arm 5 is rotated 180 ° and is advanced to the shuttle side in FIG. Then, the bobbin Y is mounted in the shuttle by the bobbin case attaching / detaching mechanism, and the process proceeds to step 20. In step 20, the operation of the sewing machine main body 51 is permitted and sewing is started.

Then, the process proceeds to step 21, step 2
1, the rotary arm 5 is retracted to the retracted position of the guide shaft 4 and is rotated counterclockwise by 60 ° in FIG. 10 to remove the residual thread bobbin X held at one end of the rotary arm 5. Go to position B, go to step 22,
In step 22, the residual thread of the bobbin X is removed.

FIG. 9 shows the procedure of this residual yarn removing operation in detail. First, in step 1, the motor M2
Is driven to start winding of the residual yarn remaining on the bobbin X, and the process proceeds to step 2. In step 2, it is determined whether or not the residual yarn on the bobbin X has been removed. This determination is made by stopping the rotation of the bobbin X when the residual thread of the bobbin X is removed and stopping the output of the pulse wave shown in FIG. 4 from the reflective optical sensor 44.

Then, in step 2, when the pulse wave is output, the same judgment is repeated until the pulse wave is not output because the residual thread is being removed. On the other hand, when the pulse wave is not output, the residual thread is output. It is determined that the removal is completed, and the process proceeds to step 3, and in step 3, the motor M
2 is stopped, and the process proceeds to step 4. In step 4, the rotational speed of the bobbin X detected by the reflection type optical sensor 44 and the ⅛ counter 46 as the residual yarn amount detecting means at the time of removing the residual yarn (remaining amount). The yarn removal amount) Rz is stored, and the flow of the residual yarn removal process shown in FIG. 9 ends.

Then, the process proceeds to step 23 of the main flow shown in FIG. 6, and in step 23, the number of revolutions (remaining yarn removal amount) Rz of the bobbin X when removing the remaining yarn is set to the remaining yarn length Lz.
In step 24, and in step 24, the lower thread consumption length (lower thread consumption amount) Ls due to the actual sewing using the bobbin X is calculated from Ls = Lm-Lz, and the procedure proceeds to step 25. , Step 25, the lower thread amount (corresponding to the bobbin rotation speed) required for the next sewing Lm = Ls +
It is calculated from Lz (min). Here, Ls is the value calculated in step 24, and Lz (min) is
It is the length of the bobbin thread derived from the bobbin case 8 required for the nipping by the nipping member of the residual thread removing device 41. Thus, Lz (min) is the bobbin thread amount Lm required for the next sewing.
In consideration of the above, the accuracy of the lower thread winding amount Lm can be further improved.

Then, the process proceeds to step 26 and step 2
6, the bobbin thread amount Lm required for the next sewing is converted into the rotational speed Rm of the motor M1 for winding on the bobbin, and the process proceeds to step 27. At step 27, the rotating arm 5 is moved to the timepiece shown in FIG. When rotated by 120 ° in the direction, the empty bobbin X from which the residual yarn has been removed advances to the lower thread winding position C. Then, the process proceeds to step 28, and in step 28, the lower thread winding device 40 winds the lower thread around the empty bobbin X. The bobbin winding operation on the bobbin X is performed according to the flow shown in FIG. The yarn winding length at this time is the value Lm calculated in step 25.

Then, the processes of steps 29 to 43 are carried out. Since the processes of steps 29 to 43 are the same as the processes carried out in steps 14 to 28 except that the bobbins X and Y are replaced.
The description here is omitted. Then, when the process of step 43 is completed, the process returns to step 14.

As described above, according to the bobbin thread winding amount control device of the present embodiment, the bobbin 7 is moved by the residual yarn removing device 41.
Of the residual thread is detected, and the residual thread amount is detected by the reflection type optical sensor 44 and the 1/8 counter 46 as the residual thread amount detecting means, and based on the residual thread amount and the bobbin thread amount wound on the bobbin. Then, the calculation means 64 calculates the amount of bobbin thread required for the next sewing, and sends the amount of bobbin thread required for the next sewing to the bobbin thread winding device control means 60. The bobbin winding device 40 is driven, and the bobbin 7 is wound on the bobbin 7 by detecting the amount of the bobbin wound on the bobbin 7 by the reflection type optical sensor 43 as the bobbin amount detecting means and the 1/8 counter 45. When the amount of bobbin thread matches the amount of bobbin thread required for the next sewing, the bobbin thread winding device 40 is controlled by the bobbin thread winding device control means 60.
Since the drive of the machine is stopped and the actual bobbin thread consumption amount is wound on the bobbin as the bobbin thread amount required for the next sewing, not only the normal sewing machine but the sewing pitch during one sewing is constant. Even for a sewing machine that changes without straining, it is possible to minimize the use of the bobbin lower thread. Further, since the actual bobbin thread consumption amount is wound around the bobbin as the bobbin thread amount required for the next sewing, it is not necessary to preset the number of times of sewing.

Further, the amount of bobbin thread wound around the bobbin 7 is set by the setting switch 52c as bobbin thread amount setting means.
This bobbin thread setting amount is switched to the bobbin thread amount required for the next sewing by the switching means 63, and the input item by the setting switch 52c is, for example, the minimum thread number necessary for roughly setting the bobbin thread winding length. , Only the winding length, for example, the time before the actual bobbin thread consumption amount becomes the bobbin thread amount required for the next sewing (before one sewing is finished; in the present embodiment, bobbins X, Y). Until the end of 2 stitches by each first use) or when changing the sewing pattern, this bobbin thread setting amount can be switched to the bobbin thread amount required for the next sewing, and the input setting after switching is unnecessary. (Since the actual bobbin thread consumption amount is always fed back as the bobbin thread winding amount for the next time), the input setting at the time of setting is simplified (Japanese Patent Application No. 5-239).
Since it is not necessary to input all the number of times of sewing, the amount of thread consumed for each sewing, the thread type, the thread count, etc. as in the apparatus of Japanese Patent No. 194), it is possible to improve the operability. ing.

Furthermore, the lower thread consumption amount is obtained by detecting the residual thread of the bobbin 7, that is, the residual thread is detected and the lower thread consumption amount is obtained with the winding diameter reduced. Therefore, the bobbin thread consumption amount is detected from the number of revolutions of the bobbin 7 arranged in the shuttle during the conventional sewing machine operation, that is, the winding diameter of the yarn changes greatly from large to small and the actual yarn consumption of one revolution of the bobbin 7 is detected. The error can be reduced as compared with the case where the error in the lower thread consumption amount is large when the amount is large and when the amount is small, and therefore reliability can be improved. In addition, since the detection can be performed in such a state that the yarn amount is small, there is also an effect that the detection time can be shortened.

FIG. 15 is a control block diagram of an automatic bobbin thread supplying device to which a bobbin bobbin winding amount control device according to another embodiment of the present invention is applied. In this embodiment, the amount of bobbin thread required for the next sewing (actual bobbin thread consumption amount) is not calculated but the rotation of the shuttle shaft is detected by the rotation detecting means 70 such as an encoder. This rotation detecting means 70
The pulse wave output from the counter 71 is obtained by counting the pulse wave output from the counter 71. The bobbin thread amount (actual bobbin thread consumption amount) required for the next sewing is directly switched.
3 is input.

Even with this construction, the lower thread consumption amount is fed back as the lower thread amount required for the next sewing operation, so that the same effect as in the previous embodiment can be obtained. Needless to say.

Although the invention made by the present inventor has been specifically described based on the embodiments, the invention is not limited to the above embodiments and various modifications can be made without departing from the scope of the invention. Needless to say, for example, in the above embodiment, the bobbin rotation is detected by the hole 7
Although it is configured to be performed by the reflection type optical sensors 43 and 44 using a, for example, a mark or the like is attached to the side surface of the bobbin 7, and the reflection type optical sensors 43 and 44 are used using this mark.
May be performed according to

Further, instead of the reflection type optical sensors 43 and 44, for example, an encoder or the like may be used.

In the above embodiment, the bobbin Y is wound with the bobbin thread before the remaining thread of the bobbin X used for the first sewing is removed, and the input setting is made for the first bobbins X and Y. By winding the value, the bobbin used for sewing the third piece is fed back with the lower thread consumption amount.
By removing the residual thread of the bobbin X used for sewing the second piece and winding the lower thread around the bobbin Y, the lower thread consumption amount can be fed back from the bobbin Y used for the second sewing. It will be possible.

In the above embodiment, the target of rotation detection is the bobbin, but the present invention is not limited to the bobbin. For example, the output shafts of the motors M1 and M2 may be the target of rotation detection. When the motors M1 and M2 are pulse motors or brushless motors, rotation can be detected by an electric circuit. Further, when it is difficult to detect rotation by an electric circuit, the above-mentioned motor M1,
As with M2, rotation can be detected by the motor output shaft.

[0061]

As described above, according to the bobbin bobbin thread winding amount control device of claim 1, the bobbin bobbin thread consumption amount consumed by the sewing machine is detected by the bobbin thread consumption amount detecting means. , This bobbin thread consumption amount is sent to the bobbin thread winding device control means so as to wind the bobbin as a bobbin thread amount required for the next sewing, and the bobbin thread winding device control means drives the bobbin thread winding device, The amount of bobbin thread wound on the bobbin is detected by the bobbin thread amount detecting means, and when the bobbin thread amount wound on the bobbin matches the bobbin thread amount required for the next sewing, the bobbin thread winding device control means. By this, the drive of the bobbin thread winding device is stopped, and the actual bobbin thread consumption amount is wound on the bobbin as the bobbin thread amount required for the next sewing. For sewing machines whose sewing pitch changes without being constant Also, it is possible to minimize the leftover of the lower thread of the bobbin. Further, since the actual bobbin thread consumption amount is wound around the bobbin as the bobbin thread amount required for the next sewing, it is not necessary to preset the number of times of sewing.

According to the bobbin bobbin winding amount control device of the second aspect, in addition to the first aspect, the residual yarn removing device removes the residual yarn of the bobbin and detects the residual yarn amount. The amount of bobbin thread required for the next sewing is calculated by the computing means based on the residual thread amount and the amount of bobbin thread wound on the bobbin. The same effect as that of claim 1 can be obtained because the bobbin is fed to the bobbin winding device control means and is wound on the bobbin so that the actual bobbin thread consumption amount is the bobbin thread amount required for the next sewing. Is possible.

According to the bobbin winding amount control device of the third aspect, in addition to the first or second aspect, the lower yarn amount setting means sets the amount of the lower thread wound around the bobbin. The bobbin thread setting amount is switched by the switching means to the bobbin thread amount required for the next sewing, and the input item by the bobbin thread amount setting means is, for example, the minimum necessary thread number for setting the bobbin thread winding length roughly. , The winding length, etc., and this bobbin thread setting amount is required for the next sewing, for example, before the actual bobbin thread consumption amount becomes the bobbin thread amount required for the next sewing or when the sewing pattern is changed. It is possible to improve the operability because it is configured such that it can be switched to a different bobbin thread amount, the input setting after switching is not necessary, and the input setting at the time of setting is simplified.

According to the bobbin bobbin winding amount control device of claim 4, the residual yarn removing device removes the residual yarn amount of the bobbin, and the residual yarn amount detecting means detects the residual yarn amount. The amount of thread wound around the bobbin is set by the setting means based on the thread amount, and the remaining thread amount is detected while the bobbin winding diameter is reduced to obtain the lower thread consumption amount. The error can be made smaller than that in which the lower thread consumption is detected from the number of rotations of the bobbin arranged in the shuttle, that is, the lower thread consumption is detected while the winding diameter of the thread changes greatly from large to small. It is possible to improve reliability. In addition, since the yarn amount can be detected in a small amount, the detection time can be shortened.

[Brief description of drawings]

FIG. 1 is an overall configuration diagram of an automatic bobbin thread feeder to which a bobbin bobbin winding amount control device according to an embodiment of the present invention is applied.

FIG. 2 is a control block diagram specifically showing a configuration inside the CPU of FIG.

FIG. 3 is an explanatory view showing a bobbin, (a) is a front view,
(B) is a side view of the rotation detecting means side.

FIG. 4 is a waveform diagram output from the rotation detecting means.

FIG. 5 is a flowchart showing an operation procedure of the same upper and lower yarn automatic feeders.

FIG. 6 is a flowchart following on from FIG.

FIG. 7 is a flowchart following FIG.

FIG. 8 is a flowchart specifically showing a bobbin thread winding process in the operation procedure of the same upper and lower yarn automatic feeders.

FIG. 9 is a flowchart specifically showing a residual yarn removing process in the operation procedure of the same upper and lower yarn automatic feeders.

FIG. 10 is a front view showing a bobbin changing device of the same upper and lower yarn automatic feeding device.

FIG. 11 is a plan view of the above bobbin changing device.

FIG. 12 is a side view of the above bobbin changing device.

FIG. 13 is a rotary arm that constitutes the same bobbin changing device;
It is a front view showing the relationship between a forward-backward movement lever and a guide shaft.

FIG. 14 is a perspective view of the same upper and lower yarn automatic feeders.

FIG. 15 is a control block diagram of an automatic bobbin thread supplying device to which a bobbin bobbin winding amount control device according to another embodiment of the present invention is applied.

[Explanation of symbols]

 7 bobbin 40 bobbin winding device 41 residual thread removing device 43,45 bobbin thread amount detecting means 44,46 residual thread amount detecting means 52c bobbin thread amount setting means 60 bobbin thread winding device control means 63 switching means 64 computing means 70,71 Lower thread consumption detection means

Claims (4)

[Claims] 1. A bobbin winding device for winding a bobbin on a bobbin by rotating the bobbin, a bobbin winding device control means for controlling driving and stopping of the bobbin winding device, and the bobbin winding device. The device detects the amount of bobbin thread wound on the bobbin by the device and the bobbin thread consumption of the bobbin consumed by the sewing machine, and this bobbin thread consumption is used for the next sewing. A bobbin bobbin winding amount control device comprising: a bobbin thread consumption amount detecting means for sending the bobbin as a required bobbin amount to the bobbin winding device control means. 2. A bobbin bobbin winding amount control device according to claim 1, wherein the bobbin thread consumption amount detecting means removes residual thread of the bobbin, and removes the bobbin from the bobbin by the residual thread removing device. Remaining thread amount detecting means for detecting the remaining thread amount, the lower thread amount detected by the lower thread amount detecting means and the remaining thread amount detected by the remaining thread amount detecting means, and The bobbin bobbin winding device is characterized in that the bobbin bobbin winding device is configured to calculate the bobbin thread amount and send the bobbin thread amount required for the next sewing to the bobbin winding device control device so as to wind the bobbin. Quantity control device. 3. The bobbin winding amount control device according to claim 1 or 2, and a bobbin amount setting means for setting an amount of the bobbin wound on the bobbin by the bobbin winding device, and the bobbin winding amount. A bobbin thread winding amount control device comprising a bobbin winding amount control device which switches between a bobbin thread setting amount set by a setting device and a bobbin thread amount required for next sewing, and sends the bobbin thread winding device control device to a bobbin thread winding device control means. 4. A residual thread removing device for removing residual thread of a bobbin, a residual thread amount detecting means for detecting an amount of residual thread taken out from the bobbin by the residual thread removing device, and a residual thread amount detecting means for detecting the residual thread amount. A bobbin bobbin thread winding amount control device comprising: setting means for setting the amount of yarn wound around the bobbin based on the remaining yarn amount.