JPH08215464A - Bobbin replacing device - Google Patents

Abstract

PURPOSE: To improve the operability of a device by providing an automatic start switch selecting the automatic start mode and a manual start switch manually starting the device when the automatic start mode is not selected. CONSTITUTION: This bobbin replacing device is provided with an automatic start switch 52ba selecting the automatic start mode automatically starting a device each time a power source is turned on and a manual start switch 52bb manually starting the device when the automatic start mode is not selected. When the automatic start mode is selected by the automatic start switch 52ba, the device is automatically started each time the power source is turned on while the manual start switch 52bb is not operated, and the operation is simplified. If the manual start switch 52bb is operated as required when the automatic start mode is not selected, the device is manually started.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a bobbin changing device for a sewing machine.

[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 the bobbin thread feeder of the sewing machine described in Japanese Patent Application Laid-Open No. 5-192476, which has been previously filed. Japanese Patent Application No. 5-203612 proposes a device that can automatically remove residual yarn.

A bobbin case in which a bobbin on which a bobbin thread is wound is housed inside and is installed in a hook of a sewing machine is described in Japanese Patent Application No. 5-203612. And a bobbin exchange which comprises a bobbin case gripping means (electromagnet suction head) capable of holding and releasing this bobbin case, and a rotating arm capable of rotating the bobbin case gripping means about one axis as a fulcrum and sliding in the axial direction. And a bobbin winding device that winds a bobbin around the bobbin and a residual yarn removing device that removes residual yarn from the bobbin. The bobbin case inside the hook is grasped by the bobbin case gripping means and pulled out from the inside of the hook by appropriately rotating, advancing and retracting the bobbin case, and the bobbin case containing the bobbin wound bobbin is Has to be mounted in the kettle was gripped by Nkesu gripping means. The bobbin case is located at the residual thread removing position to remove the residual thread of the bobbin, and the bobbin case is located at the bobbin winding position so that the bobbin can be wound around the bobbin. It has become. An example of a device for automatically threading a bobbin case and cutting the bobbin thread together with the bobbin winding device in the bobbin winding device is described in, for example, Japanese Patent Application No. 5-239194. There is.

However, even the above device has the following problems. That is, in the above device, the switch for starting the device is not described. Therefore, it is generally considered that the device is driven / stopped by the manual switch, but the power is turned on. Since the operator must turn on the manual switch after doing so, there is a problem that the operation becomes complicated and the operability is deteriorated.

Further, it is necessary to appropriately prohibit or permit the operation of the sewing machine main body and the device based on the operating state of the device and the on / off state of the switch, but such a description is not made. Therefore, for example, when the operator is sewing, there is a fear of mutual interference such as the device exchanging the bobbin, and the reliability of the device is reduced.

Therefore, it is a first object of the present invention to provide a bobbin changing device in which the operability of the device is improved.

Further, in addition to the above first object, the present invention has a second object to provide a bobbin exchanging device in which mutual interference between the main body of the sewing machine and the device is prevented and the reliability of the device is improved. To do.

[0010]

In order to achieve the first object, a bobbin exchanging device according to a first aspect of the present invention is a bobbin case gripping means capable of gripping or releasing a bobbin case, and a sewing machine using the bobbin case gripping means. The first bobbin case holding means and the second moving means for moving the bobbin case gripping means on a plane orthogonal to the hook shaft of the sewing machine. By moving the bobbin case gripping means to remove the bobbin case from the hook of the sewing machine, and moving the bobbin case gripping means on the orthogonal plane so that the bobbin case containing the bobbin wound with the lower thread faces the hook. In the bobbin exchanging device in which the bobbin case is mounted on the hook by moving the bobbin case in the axial direction after the automatic start mode is started automatically every time the power is turned on. And an automatic start switch for selecting, when the auto-start mode is not selected, was provided with a manual start switch to start the device manually, the.

Further, in order to achieve the above first object,
According to a second aspect of the present invention, in addition to the first aspect, the bobbin changing device includes a manual stop switch for manually stopping the device during operation of the device.

Further, in order to achieve the above second object,
A bobbin exchanging device according to claim 3 is, in addition to the above-mentioned claim 1 or 2, a bobbin exchanging device control means for controlling drive / stop of the device, a sewing machine control means for controlling drive / stop of the sewing machine, and an automatic start switch. , A manual switch, and an operation prohibition / permission command generating means for sending an operation prohibition command or an operation permission command to the sewing machine control means, the bobbin exchange device control means based on information from the bobbin exchange device control means.

[0013]

According to the bobbin changing device of the first aspect, when the automatic start mode is selected by the automatic start switch, the automatic start mode is automatically selected without the operator having to operate the manual start switch each time the power is turned on. The device is started and the operation is simplified. Further, when the automatic start mode is not selected, the operator manually operates the manual start switch to start the device manually.

According to the bobbin exchanging device according to the second aspect, when the operator operates the manual stop switch as needed even when the device is operating,
The device is stopped manually.

According to the bobbin changing device of the third aspect, the operation prohibiting / permitting command generating means causes the sewing machine controlling means and the bobbin based on the information from the automatic start switch, the manual switch and the bobbin changing device controlling means. Appropriate operation prohibition or permission commands are sent to the exchange control means to prevent mutual interference.

[0016]

Embodiments of the present invention will now be described in detail with reference to the drawings. First, an outline of an automatic bobbin thread feeder to which the bobbin exchanging device of the present invention is applied will be described with reference to FIGS.

This automatic bobbin thread feeder is used 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 and slightly bends. The bobbin 7 is formed 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.

The forward / backward lever 6 is rotatably supported by a shaft 9 standing on the main base 3, as shown in FIGS. 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 as a first moving means attached to the main base 3 by a support plate 10. And
As shown in FIGS. 12 and 13, a pin 14 projecting from the surface of a collar 14 rotatably attached to the boss 5a of the rotating arm 5 engages with the long hole 6a of the forward / reverse lever 6. I am fit. 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. Along with that, the rotating arm 5 moves the forward / backward lever 6
It goes forward and backward along the guide shaft 4 through the pin 15 that engages with the long hole 6a. That is, the rotating arm 5 is shown in FIG.
2. The bobbin case attachment / detachment position A side, which is the sewing position where the shuttle 16 shown in FIG. 14 is disposed, and the opposite side (the remaining thread removing position B and the bobbin thread winding position C are present) are guided along the guide shaft 4. You can move forward and backward.

The rotation drive device for the rotating 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 constructing the gear 26 and the gear 27 with a predetermined gear ratio, the rotary arm 5 uses the motor 19 as the second moving means as a drive source and the Geneva mechanism of the rotary drive device through the guide shaft 4. It is rotated in units of °.

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 lower thread winding position C, the lower thread 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.

A residual yarn removing device 41 is arranged at the residual yarn removing position B. 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, the bobbin thread clamped by the clamping member can be automatically wound up. The point is that the bobbin case 8 is gripped by the bobbin case gripping means or the bobbin case is held by the bobbin case. With the case 8 being transferred and holding the bobbin case 8, the bobbin 7 is rotated by the thread drawing operation of the drawing means for drawing the thread wound around the bobbin 7, so that the thread wound around the bobbin 7 is removed. It may be any as long as it can be drawn out, for example, Japanese Patent Application No. 5-2 filed by the applicant earlier.
Appropriate ones can be adopted including the bobbin residual yarn removing device described in the specification of 03610 and the specification of Japanese Patent Application No. 6-40351. The driver 4 is attached to the motor M2.
8 is connected, and the motor M2 is driven by a 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 includes an automatic start switch 52ba and a manual start switch 52.
bb, a manual stop switch 52bc, and a sewing pattern input switch 52bd.

The automatic start switch 52ba is for setting the automatic bobbin thread supplying device to the automatic start mode every time the power switch 52a is turned on. The cancellation of the automatic start mode is performed by turning off the automatic start switch 52ba.

The manual start switch 52bb is
This is for the operator to start the automatic bobbin thread feeder as needed when the automatic start mode is not selected.

The manual start switch 52bc is
This is for the operator to stop the automatic bobbin thread feeder, if necessary, during the operation of the automatic bobbin thread feeder.

The sewing pattern input switch 52bd is for inputting a switching signal to the switching means 63 described later in response to the input of the sewing pattern.

The setting switch 52c is composed of a dip switch, a cord switch, etc., by which the yarn count and the yarn winding length can be inputted. 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 automatic bobbin thread feeder control means 55 is further provided with a rotation speed conversion means 65 for converting the set thread winding length into the rotation speed of the bobbin in accordance with the 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 sewing pattern input switch 52bc. 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, in response to a signal from the lower thread winding device control means 60, the bobbin rotation speed at the time of the next lower thread winding is switched to the second or third bobbin so as to be sent to the lower thread winding device control means 60. (See below for details). Similarly, when the sewing pattern is changed by the sewing pattern input switch 52bd, the setting is switched so that the lower thread setting rotation speed is sent to the lower thread winding device control means 60.

Further, the lower thread automatic feeder control means 55 is
A bobbin exchanging device control means 61 for sending a signal for controlling driving / stopping of the bobbin exchanging device 42 to the driver 49 and the solenoid valve 50, a sewing machine control means 66 for controlling the sewing machine main body 51, a bobbin exchanging device control means 61 and the above. Automatic start switch 52ba and manual switch 52b
b, 52bc based on the information from the sewing machine control means 6
6. Operation prohibition / permission command generating means 8 for transmitting an operation prohibition command or an operation permission command to the bobbin exchange device control means 61
It has 0 and.

That is, the operation prohibition / permission command generating means 8
When the automatic start mode is selected by the automatic start switch 52ba, 0 sends an operation prohibition command to the sewing machine control means 66 and an operation permission command to the bobbin exchanging device control means 61 after the power is turned on. The exchanging device 42 is made to perform the operation of a predetermined procedure. Of course, during the procedure, signals are exchanged between the bobbin changing device control means 61, the residual thread removing device control means 62, and the lower thread winding device control means 60, and the residual thread removing device 4
1. The bobbin winding device 40 is also driven (details will be described later).

When the automatic start mode is not selected by the automatic start switch 52ba and the manual start switch 52bb is off, the sewing machine control means 66 is given an operation permission command and the bobbin exchanging device control means 61 is prohibited from operating. Each command is sent out.

Further, the manual start switch 52b
When the device is started by turning on b, an operation prohibition command is sent to the sewing machine control means 66 and an operation permission command is sent to the bobbin exchange device control means 61, and the bobbin exchange device 42 is operated in accordance with the determined procedure. It is designed to operate.

Further, operation prohibition / permission command generating means 81
Confirms the on / off state of the manual stop switch 52bc when the bobbin case 8 is taken out from the shuttle. When the bobbin case 8 is on, the sewing machine control means 66 is given an operation permission command, and the bobbin exchange device control means 61 is prohibited from operating. The respective commands are sent out, and when the commands are off, the operation control command is sent to the sewing machine control means 66, and the operation permission command is sent to the bobbin exchange device control means 61.

Further, when the operation prohibition / permission command generating means 81 receives the sewing end signal from the sewing machine control means 66, the operation prohibition / permission command generation means 81 sends an operation prohibition instruction to the sewing machine control means 66 and an operation permission to the bobbin exchanging device control means 61. When the bobbin case 8 is attached to the hook, the operation permission command is transmitted to the sewing machine control means 66 and the operation permission command is also transmitted to the bobbin exchange device control means 61. It has become.

In this embodiment, the sewing machine control means 66 is not provided with a sewing control function, but for example, the power switch 52a and the sewing pattern input switch 52 are used.
It is also possible to control the sewing operation of the sewing machine 51 according to the input signal from bd.

Now, the lower thread automatic feeder control means 55
A ROM 53 for storing a processing procedure in the form of a program and fixed data, and a RAM 54 for temporarily storing data used for calculation, a calculation result, and the like are connected to the. ROM
The programs written in 53 are shown in flowcharts in FIGS. 5 to 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 grasped 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. Then, 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 52bb is turned on. If not, the process proceeds to step 5a and step 5a. At, 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 52bb is turned on. Therefore, in this standby state, the operator manually replaces the bobbin and performs sewing. On the other hand, when it is determined in step 5 that the manual start switch 52bb 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, and in step 6, 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, in step 8, one bobbin X is conveyed to the bobbin winding position C in step 8, 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 this 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 120 ° clockwise 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.

When the bobbin Y is wound around the bobbin Y in this way, the process proceeds to step 14, and in step 14, it is judged whether or not the sewing of 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
7, it is determined whether or not the manual stop switch 52bc is turned on, and the manual stop switch 5bc
If 2bc is turned on, the process proceeds to step 18, and in step 18, a signal permitting the sewing machine operation is sent to the sewing machine main body 51, the process returns to step 17, and the same operation is performed until the manual stop switch 52bc is cleared. repeat. 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, step 17
When it is determined that the manual stop switch 52bc is not turned on in step 17a, the process proceeds to step 17a, and 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, and in step 19, , The rotating arm 5 is rotated 180 ° and moved forward to the shuttle side in FIG. 14, the bobbin case attaching / detaching mechanism mounts the bobbin Y in the shuttle, and the process proceeds to step 20. At step 20, the sewing machine main body 51
Allow the operation of and start sewing.

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.

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 rotational speed (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, in this embodiment, when the automatic start mode is selected by the automatic start switch 52ba, the apparatus is automatically operated without the operator having to operate the manual start switch 52bb each time the power is turned on. While starting and simplifying the operation, when the automatic start mode is not selected, the operator can manually start the switch 52bb if necessary.
Since the device can be manually started by operating, the operability of the device can be improved.

Even when the apparatus is in operation, the operator can manually stop the switch 52bc if necessary.
Since the device can be manually stopped by operating, it is possible to further improve the operability of the device.

Further, based on the information from the automatic start switch 52ba, the manual switches 52bb and 52bc, and the bobbin exchanging device controlling means 61, the operation inhibiting / permitting command generating means 80 causes the sewing machine controlling means 66 and the bobbin exchanging device controlling means 61. Since it is configured to send an appropriate operation prohibition or permission command to the machine to prevent mutual interference between the sewing machine and the device, it is possible to improve the reliability of the device.

Further, the present embodiment has the following effects. That is, since the actual bobbin thread consumption amount is wound around the bobbin as the bobbin thread amount required for the next sewing,
Not only for a normal sewing machine but also for a sewing machine in which the sewing pitch during one sewing is not constant and changes, 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 the lower thread wound around the bobbin 7 is set by the setting switch 52c as the lower 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 amount of the bobbin 7, that is, the residual thread amount is detected and the lower thread consumption amount is determined 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.

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

[0068]

As described above, according to the bobbin changing device of the first aspect, when the automatic start mode is selected by the automatic start switch, the operator operates the manual start switch every time the power is turned on. The device can be started automatically even if it is not necessary, and the operation can be simplified, but when the automatic start mode is not selected, the operator can manually start the device by operating the manual start switch as needed. Therefore, the operability of the device can be improved.

According to the bobbin changing device of the second aspect, in addition to the first aspect, the device can be manually stopped when the operator operates the manual stop switch as needed even while the device is operating. With this structure, the operability of the device can be further improved as compared with the first aspect.

According to the bobbin changing device of claim 3, in addition to the claim 1 or 2, the operation prohibition / permission command is generated based on the information from the automatic start switch, the manual switch, and the bobbin changing device control means. Since the means is configured to send a proper operation prohibition or permission command to the sewing machine control means and the bobbin exchange device control means to prevent mutual interference between the sewing machine and the device, the reliability of the device can be improved. It will be possible.

[Brief description of drawings]

FIG. 1 is an overall configuration diagram of an automatic bobbin thread feeder to which a bobbin changing 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.

[Explanation of symbols]

 7 bobbin 8 bobbin case 11 first moving means 16 hook 19 second moving means 42 bobbin exchanging device 51 sewing machine 52a power switch 52ba automatic start switch 52bb manual start switch 52bc manual stop switch 61 bobbin exchanging device control means 66 sewing machine control means 80 operation Prohibition / permission command generation means

Claims (3)

[Claims] 1. A bobbin case gripping means capable of gripping or releasing a bobbin case, a first moving means for moving the bobbin case gripping means in an axial direction parallel to a shuttle shaft of a sewing machine, and the bobbin case gripping means. Second moving means for moving the bobbin case gripping means in the axial direction so that the bobbin case gripping means pulls out the bobbin case from the shuttle of the sewing machine, A bobbin exchanging device in which the case gripping means is moved on an orthogonal plane so that the bobbin case accommodating the bobbin wound with bobbin thread is opposed to the hook and then axially moved to mount the bobbin case on the hook. , Automatic start switch to select the automatic start mode to start the device automatically each time the power is turned on, and the automatic start mode is not selected To, a bobbin exchange device provided with a manual start switch to start the device manually, the. 2. The bobbin exchanging device according to claim 1, further comprising a manual stop switch for manually stopping the device during operation of the bobbin exchanging device. 3. The bobbin exchanging device according to claim 1 or 2, wherein the bobbin exchanging device control means controls drive / stop of the device, the sewing machine control means controls drive / stop of the sewing machine, an automatic start switch, and a manual. A bobbin exchanging device comprising: a switch, a bobbin exchanging device control unit, and an operation prohibiting / permitting command generating unit for sending an operation prohibiting command or an operation permitting command to the sewing machine controlling unit and the bobbin exchanging device controlling unit.