JPH05228280A - Sewing machine - Google Patents

Abstract

PURPOSE:To provide a sewing machine having an increased sewing speed. CONSTITUTION:A sewing machine is provided with a needle driving mechanism vertically moving a needle and a feeding mechanism feeding a fabric for automatically sewing a sewing pattern stored in advance, the needle driving mechanism is driven by a sewing machine motor 7, and the feeding mechanism is driven by a feeding motor 19. The sewing machine motor 7 and the feeding motor 19 are controlled by a control device 9. The control device 9 is constituted of an input device 91, a CPU 92, a ROM 93, a RAM 94, and drivers 95, 96. The CPU 92 operates a sewing speed determining means and a control means according to the program of the ROM 93. The sewing speed determining means determines the feeding mode based on the sewing pattern and determines the sewing speed according to the feeding mode. The control means controls the rotating speed and operating period of the feeding motor 19 and the rotating speed of the sewing machine motor 7 via the drivers 95, 96 based on the determined information.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sewing machine, and more particularly to a sewing machine capable of recognizing a sewing shape and varying a sewing speed according to the shape.

[0002]

2. Description of the Related Art As is well known, a sewing machine as a sewing machine of this kind is provided as a sewing machine for moving a needle up and down while feeding cloth. This sewing machine
Generally, the sewing machine main body is mounted on an operation console including a base. At the bottom of this console,
A motor and sewing machine controller are arranged. Further, the sewing machine main body has a built-in needle drive mechanism for moving a needle up and down and a cloth feed mechanism for feeding cloth. The needle drive mechanism and the cloth feed mechanism are driven by a motor, and these motors are controlled by the above-mentioned control. The drive is controlled by the device.

In such a sewing machine, as shown in FIG. 5, the needle is driven by a needle drive mechanism to pull out the needle in the period Ta and puncture the needle in the period Tb. Then, in the period Ta, the cloth feed motor is driven to feed the cloth by the cloth feed mechanism, and in the period Tb, the cloth feed motor is stopped and sewing is performed.

As described above, in the conventional sewing machine, the cloth feed motor is intermittently operated and the needle drive mechanism is also driven at a predetermined speed.

[0005]

However, in the case of the above-mentioned conventional sewing machine, the speed of the motor for driving the cloth feeding mechanism is constant and the operation is intermittent, regardless of whether the sewing shape is straight or curved. As a result, the sewing machine cannot be rotated at a high speed, resulting in poor sewing efficiency.

An object of the present invention is to solve the above-mentioned drawbacks and to provide a sewing machine with an increased sewing speed.

[0007]

In order to achieve the above object, the present invention relates to a sewing machine which automatically performs sewing based on previously stored sewing data, and a sewing pattern to be sewn based on the sewing data. Means for recognizing the shape of the sewing machine, deciding means for deciding sewing control information such as a feed speed, a feeding operation, and a sewing speed corresponding to the sewing pattern recognized by the first means, and the deciding means. A control means for controlling the rotation speed and operating time of the feed motor, the rotation speed of the sewing machine motor, and the like according to the determined information is provided.

[0008]

According to the above sewing machine, the feed mode and the sewing speed can be obtained corresponding to the shape of the sewing pattern, which allows straight lines, sharp bends, obtuse bends, gentle curves, and sharp curves. It is possible to perform sewing at the optimum feed operation and sewing speed for each shape of the sewing pattern such as a curve.

[0009]

The present invention will be described below with reference to the illustrated embodiments.

FIG. 1 is a block diagram showing a concrete example of a control device used in the sewing machine of the present invention.

Although not shown, the main body of the sewing machine has a known mechanism for moving the needle up and down and a cloth feeding mechanism for mounting cloth on the support frame and sending it in the X and Y directions. The needle driving mechanism is driven by the sewing machine motor 7. The cloth feed mechanism is driven by a pair of feed motors 19 for the X direction and the Y direction, and these motors are drive-controlled by the controller 9.

In FIG. 1, the control device 9 includes an input device 91, a processing device (CPU) 92, a ROM 93, and a RAM.
It has a 94, a sewing machine motor driver 95, and a feed motor driver 96, and is configured as follows. That is, the input device 91 can send an external command to the CPU 92. The CPU 92 calculates various sewing data and executes drive control of each external device (sewing machine motor 7, feed motor 19, etc.). A ROM 93, a RAM 94, a sewing machine motor driver 95, and a feed motor driver 96 are connected to the CPU 92 via a bus 97. The ROM 93 has a CPU 92.
A program for operating the sewing machine and a program for calculating sewing data are stored. Further, in the ROM 93, the contents of the shape of the sewing pattern statistically obtained by trial sewing in advance as shown in FIG. 3 (for example, a straight line, an acute bending angle,
A motor speed determination table 21 for determining the speed of the feed motor corresponding to obtuse bend angle, gentle bend angle, sharp curve, etc., operation mode of the feed motor, and sewing machine speed is stored. The RAM 94 stores data of each external device and sewing data.

Further, the sewing machine motor driver 95 is C
The sewing machine motor 7 is driven under the control of the PU 92. A pair of feed motor drivers 96 for the X direction and the Y direction are built in, and drive the pair of feed motors 19 for the X direction and the Y direction under the control of the CPU 92. In addition, the CPU 9
2 executes the program of the ROM 93 based on the input data from the input device 91 and the storage data of the RAM 94, thereby realizing the sewing speed determining means and the control means. The sewing speed determining means determines the feed mode based on the sewing data input from the input device 91 and the sewing data of the sewing pattern stored in the RAM 94 or the like in advance, and determines the sewing speed according to the feed mode. It is supposed to do. The control means controls the rotational speed and operating time of the feed motor and the rotational speed of the sewing machine motor based on the information determined by the sewing speed determination means.

An embodiment of such a configuration is shown in FIGS.
Will be described.

FIG. 2 is a flow chart for explaining the operation of the embodiment of the present invention. FIG. 3 is an explanatory diagram showing a table for determining the motor control speed for the sewing shape. FIG. 4 is an explanatory diagram for explaining the sewing pattern and its shape, and is shown in an XY orthogonal coordinate system.

First, as shown in FIG. 4, the sewing pattern has a straight line 100, an acute bend angle 200, an obtuse bend angle 300, a gentle curve 400, and a sharp curve 500.
In this embodiment, cloth is sewn in the order shown in FIG.

First, sewing data composed of needle drop position data in which the needle drop position of each stitch is expressed by relative coordinate values, cloth quality data and the like are input from the input device 91 to the CPU 92 (step S600). In this state, the CPU 92
The shape of the sewing pattern is recognized by performing calculation based on the amount of change in the XY coordinates of the input sewing data (step S6).
01). In this embodiment, the shape of the first sewing pattern is recognized as a straight line 100. The CPU 92 determines the motor speed determination table 2 of the ROM 93 based on the recognition of the straight line 100.
The feed mode and sewing speed corresponding to the linear shape are determined with reference to 1 and the data is output (step S60).
3). In this case, "maximum speed" of the sewing machine motor 7 and "continuous operation" and "maximum speed" of the feed mode of the feed motor 19 are selected as the sewing control data for the straight line 100. This data is sent from the CPU 92 to the sewing machine motor driver 9
5. The feed motor driver 96 sends the sewing machine motor 7 to the maximum speed, and the feed motor 19 continuously rotates to the maximum speed. Thereby, the straight part 100 is sewn at the maximum speed.

Next, assuming that the sewing pattern has a shape of an acute-angled corner portion 200 recognized based on the above calculation result, the CPU 92 causes the motor speed determination table 21 of the ROM 93 to be based on the recognized shape (corner 200). The feed mode and the sewing speed are determined by referring to the data and the data is output (step S603). In this case, as the sewing control data for the sharp bend angle 200, the speed of the sewing machine motor 7 is selected as "lowest speed", and the feed mode of the feed motor 19 is selected as "intermittent operation" or "lowest speed". This data is the CPU
92 is sent to the sewing machine motor driver 95 and the feed motor driver 96, the sewing machine motor 7 rotates at the minimum speed, and the feed motor 19 is intermittent and
It will rotate at the minimum speed in synchronization with. As a result, the sharp bend angle 200 is sewn at the lowest speed.

When the sewing of the acute-angled corner portion 200 is completed, the straight-line portion continues again, so that the above-described straight-line sewing operation is performed.

Next, when the operation of sewing the obtuse-angled corner portion 300 recognized by the above calculation is started, the CPU 92 causes the RO 92
By referring to the motor speed determination table 21 of M93, the feed mode and the sewing speed corresponding to the shape "obtuse bend" are determined, and the data is output (step S60).
3). In this case, as the sewing control data for the obtuse bend angle 300, the speed of the sewing machine motor 7 is selected as "low speed" and the feed mode of the feed motor 19 is selected as "continuous operation" or "low speed". This data is sent from the CPU 92 to the sewing machine motor driver 95 and the feed motor driver 96, the sewing machine motor 7 rotates at a low speed, and the feed motor 19 rotates continuously and at a low speed in synchronization with the sewing machine motor 7. It will be. As a result, the obtuse bend angle 300 is sewn at a low speed.

When the sewing of the obtuse-angled corner portion 300 is completed, the straight line portion continues again, so that the above-described sewing operation of the straight line 100 is performed, and then the gentle curved line portion 400 is reached.

The CPU 92 recognizes the shape of the sewing pattern as a gentle curve 400 based on the above calculation result, and refers to the motor speed determination table 21 of the ROM 93 based on the shape "slow curve" to determine the feed mode and the sewing speed. The data is determined and the data is output (step S603).
In this case, as the sewing control data for the gentle curve 400, "high speed" is selected for the sewing machine motor 7 and "continuous operation" or "high speed" is selected for the feed mode of the feed motor 19. As a result, the gentle curve 400 is sewn at a high speed.

Furthermore, the shape of the sewing pattern has a sharp curve 50.
When reaching the 0th portion, the CPU 92 recognizes from the above calculation result that the curve is a sharp curve 500, determines the feed mode and the sewing speed by referring to the motor speed determination table 21 of the ROM 93 based on this shape "a sharp curve", and The data is output (step S603). In this case, as the sewing control data for the sharp curve 500, "medium speed" is selected as the speed of the sewing machine motor 7 and "continuous operation" or "medium speed" is selected as the feed mode of the feed motor 19. As a result, the sharp curve 500 is sewn at a medium speed.

Thus, the optimum feed speed and feed operation and the sewing machine speed are achieved according to the sewing pattern, and the sewing efficiency is remarkably increased.

Here, in the above embodiment, the case where the shape of the sewing pattern is calculated and recognized from the amount of change of the XY coordinate value of the input sewing data is shown. However, information indicating the shape of the sewing pattern is previously included in the sewing data. May be added to recognize the shape of the sewing pattern from the information of the sewing data.

[0026]

As described above, according to the sewing machine of the present invention, it is possible to perform the sewing in the optimum cloth feeding mode (feeding operation) and sewing machine speed according to the sewing pattern, and the sewing efficiency is remarkably improved. ..

[Brief description of drawings]

FIG. 1 is a block diagram showing an embodiment of a sewing machine of the present invention.

FIG. 2 is a flow chart for explaining the operation of the embodiment of the present invention.

FIG. 3 is an explanatory diagram showing a motor speed determination table for determining a sewing speed and the like used in the present invention.

FIG. 4 is an explanatory diagram of a sewing pattern processed by the present invention.

FIG. 5 is an explanatory diagram of a conventional sewing operation.

[Explanation of symbols]

 7 Sewing machine motor 9 Control device 19 Feed motor 21 Motor speed determination table

Claims (2)

[Claims] 1. In a sewing machine that automatically performs sewing based on previously stored sewing data, first means for recognizing the shape of a sewing pattern to be sewn based on the sewing data, and the first means. Deciding means for deciding sewing control information such as feed speed, feed operation, sewing speed, etc. corresponding to the sewing pattern recognized by the means, and rotation speed and operating time of the feed motor and sewing machine according to the information decided by the deciding means. A sewing machine comprising: a control unit that controls a rotation speed of a motor. 2. The sewing machine according to claim 1, wherein the first means is executed based on a coordinate change amount of the sewing data.