JPH0145396B2 - - Google Patents

Description

[Detailed Description of the Invention] Purpose of the Invention (Field of Industrial Application) The present invention provides a method for moving a pallet stretched with work cloth mounted on a carriage across a vertical movement path of a needle by the operation of a drive means. The present invention relates to a sewing machine that can be moved in a desired direction to perform sewing based on pattern data.

(Prior art) In conventional sewing machines of this type, when the bobbin thread runs out during sewing or other abnormalities occur in the bobbin thread, it becomes necessary to replace or inspect the bobbin thread bobbin. In this case, stop the sewing machine, make the carriage that supports the pallet manually movable, and in this state manually move the pallet together with the carriage to a retracted position that does not obstruct the exchange of the bobbin thread bobbin. were being replaced and inspected.

(Problem to be Solved by the Invention) Therefore, when starting sewing again in this conventional sewing machine, the carriage supporting the pallet is sequentially moved from the sewing start point to the previous stop position according to the sewing pattern data. I had to. This poses a problem in that more time is spent on the auxiliary work compared to the time required to replace or inspect the bobbin thread bobbin itself, increasing the overall working time.

Structure of the Invention (Means for Solving the Problems) The present invention has been made by paying attention to the above-mentioned problems. It is enabled by the output means 31 etc. and its evacuation signal, and the pallet 1
4 or a first control means 25 for controlling the operation of the drive means 41 so that the carriage 13 moves to a retracted position where replacement of the bobbin thread bobbin 5 is not obstructed;
and storage means 27 for storing the position of the pallet 14 before evacuation or the amount of movement to the evacuation position.
and a second control means 25 for controlling the driving means 41 so that the pallet 14 returns to the position before being evacuated based on the data stored in the storage means 27.

(Function) In the sewing machine of the present invention, when the bobbin thread runs out during sewing or some other abnormality occurs in the bobbin thread, the bobbin thread bobbin 5 needs to be replaced or inspected. In this case, an evacuation signal is outputted by the evacuation signal output means, and the drive means 41 is operated under the control of the first control means 25 based on the evacuation signal, and the pallet 14 or the carriage 13 on which the work cloth 16 is stretched is moved. is moved to a retracted position that does not obstruct replacement of the bobbin thread bobbin 5, and the position of the pallet 14 before retraction or the amount of movement to the retracted position is stored in the storage means 27.

After the bobbin thread bobbin 5 is replaced or inspected in this state, the drive means 41 is operated under the control of the second control means 25 based on the data stored in the storage means 27, and the pallet 14 is returned to the position before evacuation. will be automatically moved and returned. Therefore, there is no need for any auxiliary work associated with replacing or inspecting the bobbin thread bobbin 5, and the overall working time can be significantly shortened.

(Example) Hereinafter, an example of the present invention will be described in detail with reference to the drawings.

First, the structure of the sewing machine of this embodiment will be explained based on FIGS. 2 and 3.
A bed section 3 is provided at the front of the machine base 1. A needle 4 is provided at the bottom of the front end of the sewing machine body 2 so as to be movable up and down, and a thread loop catcher 6 is provided at the bottom of the bed section 3 to removably store the bobbin thread bobbin 5 via a bobbin holder. A stitch is formed by the cooperation of the needle 4 and the thread loop catcher 6.

In front of the sewing machine main body 2, a pair of support rails 7 are arranged and fixed on both left and right sides of the machine base 1, extending in parallel in the front-rear direction (Y direction). A movable frame 9 having a guide rail 8 extending in the left-right direction (X direction) on the upper surface is supported on the support rail 7 so as to be movable in the Y direction. The movement of the shaft 11 is guided by engagement with gears 12 at both ends of the shaft 11. Guide rail 8 on the moving frame 9
A carriage 13 is supported movably in the X direction, and a pallet 14 is removably attached to the upper surface of the carriage by a pair of left and right clamps 15. A work cloth 16 is removably stretched and held on the pallet 14 by a holding frame (not shown) or the like.

An X-direction feed motor 17 is disposed on the machine base 1 in front of the movable frame 9, and as the motor 17 rotates, gears 18, 19, a spline shaft 20, and an illustration movable along the spline shaft 20 are provided. The carriage 13 is
is moved in the X direction, and the pallet 14 is fed in the same direction. or,
A Y-direction feed motor 22 is disposed on the machine base 1 in the vicinity of the X-direction feed motor 17, and as the motor 22 rotates, the moving frame is 9 is moved in the Y direction, and the pallet 14 is fed in the same direction.

Next, the control circuit of this sewing machine will be explained according to FIG. 1. 25 is a central processing unit (CPU) constituting the first and second control means;
CPU25 has read-only memory (ROM) 2
6 and a random access memory (RAM) 27 as a storage means are connected. The ROM 26 stores the origin position data, evacuation position data, work position data, and programs for controlling the overall operation of the sewing machine, etc. of the palette 14, and the RAM 27 stores predetermined sewing pattern data related to sewing, and stores the palette 14 during sewing. It is designed to store data such as the amount of movement of the robot to the retracted position.

A program input device 28 and a floppy disk device 29 are connected to the CPU 25, and sewing pattern data created by the program input device 28 is stored in a floppy disk in the floppy disk device 29, All data related to sewing stored in the RAM 27 is read into the RAM 27. The CPU 25 also includes a switch group 32 including a start switch 30 and a retraction switch 31 as a retraction signal output means, and a known thread remaining amount detector 3 for detecting the remaining amount of bobbin thread in the bobbin thread bobbin 5.
3, and a similarly known thread breakage detector 34 for detecting the breakage or loosening of the upper thread, and the signals from these switches or detectors are connected.
It is designed to be input to the CPU 25. When a thread breakage signal is output from the thread breakage detector 34, the sewing machine stops the sewing operation.

Furthermore, the CPU 25 drives a sewing machine motor 35 for driving the sewing machine, the X-direction feed motor 17, the Y-direction feed motor 22, and an alarm device 36 such as a lamp or buzzer that issues an alarm when the bobbin thread runs out. They are connected via devices 37, 38, 39, and 40, and are driven by signals from the CPU under program control. and,
In this embodiment, the X direction feed motor 1
7. The Y-direction feed motor 22 and its driving devices 38 and 39 constitute a driving means 41 for moving the pallet 14 in a desired direction across the vertical movement path of the needle 4.

Next, the operation of the sewing machine configured as described above will be explained.

Now, when the power is turned on for sewing operation of this sewing machine, it is determined in step S1 whether or not the start switch 30 is closed, as shown in FIG. 4. If the result is YES, the process proceeds to step S2. It is determined whether or not valid sewing pattern data is stored in the RAM 27. If there is no valid data, the process goes to error processing, and if there is valid data, the process goes to step S3, where the thread remaining amount detector 33 measures the bobbin thread remaining amount. And the program input device 28
Or, if the required amount of bobbin thread calculated according to the sewing pattern and the number of stitches set by the floppy disk device 29 is compared with the remaining amount of bobbin thread, and as a result, the remaining amount of bobbin thread is insufficient, That is, if the determination result in step S3 is NO, an activation signal is output from the CPU 25 to the alarm 36 via the drive device 40 in step S4, and a state in which the bobbin thread bobbin 5 has no or little bobbin thread is notified. Thereafter, the process moves to bobbin exchange processing, which will be described later.

If the result of step S3 is YES, the process proceeds to step S5, where the CPU 25 reads the origin position data of the pallet 14 from the ROM 26, and based on that data, drives the
An operating signal is output to the direction and Y direction feed motors 17 and 22 to move the pallet 14 to the origin position (position A in FIG. 3). After that, in step S6, the CPU 25 reads the sewing pattern data from the RAM 27, and based on the data, the sewing machine motor,
An operating signal is output to the X and Y direction drive motors 35, 17 and 22 to operate the needle 4 and the like and move the pallet 14 in the X and Y directions in FIG.

In step S7, the thread breakage detector 3
4, it is determined whether or not the sewing operation of the sewing machine is stopped by outputting a thread breakage signal due to needle thread breakage or loosening. If the result is NO, the process proceeds to step S8; if YES, the process proceeds to step S8.
The process proceeds to step 9, where it is notified that the upper thread has been cut for some reason or that the lower thread has completely disappeared and the upper thread has become loose.

Then, in step S8, the RAM
In step 27, it is determined whether or not pattern data related to sewing remains, and if the result is YES, the process returns to step S6 and the steps S6 and S are performed.
7, the operation of S8 is repeated. Therefore, processed cloth 1
The pallet 14 on which the sewing machine 6 is stretched is arbitrarily moved in the X and Y directions for each reciprocating movement of the needle 4 based on the sewing pattern data, and predetermined sewing is automatically performed. If the determination result in step S8 is NO, that is, if one cycle of sewing has been completed, the process proceeds to step S10, where thread trimming is performed.
After that, in step S11, the step S
5, the pallet 14 is moved to the original position, and further, in step S12, the pallet 14 is moved to the working position (position B in Fig. 3), and replaced with a new unsewn pallet at that position. be done.

On the other hand, the determination result in step S3 is
In the case of NO, after the state is notified in step S4 as described above, the evacuation switch 31 is turned on in step S1 shown in FIG. The bobbin 5 is moved to a retracted position (position C in FIG. 3) that does not interfere with replacement or inspection of the bobbin 5, and returns to step S1 in FIG. 4 to wait for the start switch 30 to be turned on. By the way, palette 1
4 is placed in the working position, the carriage 13 covers the front of the bobbin thread bobbin 5, making it inconvenient to replace or inspect the bobbin thread bobbin 5.

Therefore, with the pallet 14 moved to the retracted position and the upper front part of the thread ring catcher 6 opened, the bobbin case is taken out from inside the thread ring catcher 6 and the bobbin thread bobbin 5 is removed. can be easily replaced and inspected.

Also, the determination result in step S7 in FIG.
If YES, that is, if a thread breakage occurs and a thread breakage signal is output from the thread breakage detector 34, the process advances to step S9 as described above, and after an alarm is issued, the CPU 25 controls the sewing machine motor 35 and the thread breakage signal. Operation control of the X and Y direction feed motors 17 and 22 is stopped, and scanning of the retract switch 31 is started in step S1 in FIG.

Then, when the evacuation switch 31 is closed,
In step S2, the CPU 25 reads the origin position data of the pallet 14 from the ROM 26, and based on the data, outputs an operating signal to the X and Y direction feed motors 17 and 22 via the drive devices 38 and 39 to move the pallet 14 to the origin. At the same time, it is determined in step S3 whether the pallet 14 has reached the original position, and this operation is repeated until the pallet 14 is moved to the original position. Further, the CPU 25 counts the number of pulses of the operating signal to the X and Y direction feed motors 17 and 22, and stores in the RAM 27 the number of pulses for moving the pallet 14 to the origin position in the X and Y directions in step S4.

After that, in step S5, the CPU 25
The evacuation position data is read from the ROM 26, and based on the data, the X,
An operating signal is output to the Y-direction feed motors 17 and 22 to move the pallet 14 from the original position to a retracted position shown in FIG. 3 that does not hinder replacement or inspection of the bobbin thread bobbin 5. Then, the CPU 25 performs step S6.
In this step, the number of pulses for moving the pallet 14 from the previous stop position to the home position and the number of pulses for moving the pallet 14 from the home position to the evacuation position are calculated separately in the X direction and the Y direction, and stored in the RAM 2 as evacuation movement amount data.
7 to be memorized.

Therefore, in the same manner as described above, with the pallet 14 moved to the retracted position and the upper front part of the thread ring catcher 6 opened, the bobbin case is taken out from inside the thread ring catcher 6 and lowered. The thread bobbin 5 can be easily replaced and inspected.

Thereafter, when the startup switch 30 is closed, the operation is determined in step S7, and the CPU
25 reads the evacuation movement amount data from the RAM 27 in step S8, and
At step 9, an operating signal is output to the X and Y direction feed motors 17 and 22 based on the data, and the pallet 14 is moved and returned to its previous stopped position. In this state, it is determined in step S10 whether or not the starting switch 30 is to be closed again, and when the switch 30 is closed, the sewing operation is restarted from the previously stopped position.

Therefore, after replacing or inspecting the bobbin thread bobbin 5,
The sewing operation can be resumed immediately without the need for the troublesome operation of sequentially manually feeding the pallet 14 from the sewing start point to the previous stop position according to the sewing pattern data.

Note that the present invention is not limited to the above-mentioned embodiment, and for example, the evacuation switch 31 may not be provided,
The remaining thread amount detector 33 and thread breakage detector 34 are used as evacuation signal output means, and when a detection signal is output from these remaining thread amount detector 33 or thread breakage detector 34, the carriage 13 and pallet 14 are immediately moved to the evacuation position. It is also possible to change the configuration of each part arbitrarily and embody it without departing from the spirit of the invention, such as configuring it so that it can be moved.

Effects of the Invention As described in detail above, the present invention provides a second bobbin after replacement or inspection of the bobbin thread bobbin based on the data stored in the storage means that stores the position before retraction or the amount of movement to the retraction position. Since the control means controls the automatic return operation of the pallet to the position before it was evacuated, it is no longer necessary to manually feed the pallet sequentially from the sewing start point to the previous stop position in accordance with the sewing pattern data as in the past. First, there is no need for any auxiliary work associated with replacing or inspecting the bobbin thread bobbin, resulting in an excellent effect that the overall working time can be significantly shortened.

[Brief explanation of drawings]

FIG. 1 is a control circuit diagram of a sewing machine embodying the present invention, and FIG. 2 is a perspective view showing the configuration of the sewing machine.
Fig. 3 is a partial perspective view of the sewing machine showing the state in which the pallet has been moved to the retracted position, Fig. 4 is a flowchart for explaining the sewing operation of this sewing machine, and Fig. 5
6 are flowcharts for explaining operations when replacing or inspecting the bobbin thread bobbin, respectively. In the figure, 2 is the sewing machine body, 4 is the needle, 5 is the bobbin thread bobbin, 13 is the carriage, 14 is the pallet, 1
6 is the work cloth, 17 is the X direction feed motor, 22 is Y
directional feed motor, 25 a CPU constituting first and second control means, 26 a ROM, 27 a RAM constituting a storage means, an evacuation switch 31 as an evacuation signal output means, a thread remaining amount detector 33, Yarn breakage detectors 34 and 41 are driving means.

Claims (1)

[Claims] 1. By the operation of the drive means 41, the carriage 13
A pallet 14 is mounted on top and has a work cloth 16 stretched thereon.
In a sewing machine that is capable of sewing based on pattern data by moving the needle 4 in a desired direction across the vertical movement path of the needle 4, an evacuation signal is output for replacing the bobbin thread bobbin 5. output means 31, etc., and a first control unit that is enabled by the evacuation signal thereof and controls the operation of the drive means 41 so that the pallet 14 or the carriage 13 moves to the evacuation position where the exchange of the bobbin thread bobbin 5 is not obstructed. Control means 2
5, a storage means 27 for storing the position of the pallet 14 before the evacuation or the amount of movement to the evacuation position, and the pallet 14 is returned to the position before the evacuation based on the data stored in the storage means 27. A sewing machine comprising a second control means 25 for controlling the drive means 41.