JPH0489091A - Sewing machine device - Google Patents

Abstract

PURPOSE:To perform correct sewing without sewing drift by providing memory tables for storing the proper timing of drive motors in response to different dynamic characteristics of fabric feed systems depending on the fabric feed (sewing) directions, and controlling the fabric feed according to the table contents. CONSTITUTION:Proper drive quantities of driving means 17, 18 in response to dynamic characteristics of fabric feed systems 20, 21 depending on the forward and reverse directions of the fabric feed along the coordinate axes are stored in memory tables 14, 15. A CPU 11 drives the driving means 17, 18 with the drive quantities obtained by referring the contents of the memory tables 14, 15 from the forward and reverse directions of the fabric feed. The fabric feed can be performed in response to the proper characteristic according to the sewing direction, and correct sewing can be performed without sewing drift.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention is directed to a sewing machine, in particular, in synchronization with a seam forming means, based on the driving force of a predetermined driving means, along at least one coordinate axis. The present invention relates to a sewing machine device having a cloth feeding mechanism that feeds cloth in a direction.

[Prior Art] Conventionally, industrial sewing machines and the like have been known to have an xy table for feeding cloth.

FIG. 3 shows the construction of the cloth feeding mechanism of this type of sewing machine. The illustrated sewing machine has a stitch forming mechanism 3 that forms stitches by moving the needle 2 up and down.

The cloth feed control is performed by moving the cloth presser device 1 that holds the work cloth in the x and y force directions using the feed table 4.

The movement of the feed base 4 is carried out in synchronization with the vertical movement of the needle by a pair of pulse motors corresponding to the x and y directions, respectively.
In this way, a desired sewing pattern is formed.

The sewing control described above is performed by a control circuit using a microprocessor or the like.

[Problems to be Solved by the Invention] FIG. 4 shows the feeding mechanism of the feeding table 4. Here, only a drive mechanism in one axis direction in the X to Y directions is shown.

The feed base 4 is fixed to a part of a timing belt 42 made of a cogged belt or the like, and the timing belt 4
2 is wound around sprockets 43 and 43 as shown.

One of the sprockets 43 is rotationally driven by the pulse motor 41.

In the conventional configuration as shown in FIG. 4, the dynamic characteristics when moving the feed table 4 in one direction are determined by the timing belt length 31, and the dynamic characteristics when moving in ten directions are determined by the timing belt eldest daughter 2. .

Here, as is clear from FIG. 4, since the feed base 4 is connected to one side of the timing belt 42, the above-mentioned timing belt length p1.92 is extremely different, and as the sewing area becomes larger, This difference is not increased.

Therefore, when sewing progresses in one direction and when sewing progresses in ten directions,
There has been a problem in that there is a difference between the desired sewing pattern and the actually sewn pattern.

The object of the present invention is to solve the above-mentioned problem E, to create a sewing machine that can drive a cloth feeding device with appropriate characteristics depending on the sewing direction, can perform accurate sewing without any seams, and can sew products of good quality. The goal is to provide equipment.

[Means for Solving the Problems] In order to solve the above problems, in the present invention, in synchronization with the seam forming means, based on the driving force of a predetermined driving means,
In a sewing machine device having a cloth feeding mechanism that feeds the cloth in the forward and reverse directions along at least one coordinate axis, the cloth feed mechanism depends on the forward and reverse directions of the cloth feed along the coordinate axis, respectively. The drive means is controlled by using a memory table in which drive timings of the drive means are stored that are appropriate according to the dynamic characteristics of the drive means, and drive timings obtained by referring to the contents of this memory table in the forward and reverse directions of cloth feeding. A configuration is adopted that includes a driving lid feed control means.

[Function] According to the above configuration, the cloth feeding means is driven in the forward and reverse directions of cloth feeding at appropriate drive timings depending on the dynamic characteristics of the cloth feeding mechanism depending on these directions. be able to.

[Example] Hereinafter, the present invention will be described in detail based on the example shown in the drawings.

FIG. 1 shows the structure of a control system of a sewing machine employing the present invention. The fabric feeding mechanism of the sewing machine itself is shown in Figures 3 and 4.
It is assumed that the configuration is similar to the conventional example shown in the figure.

In FIG. 1, reference numeral 11 denotes a CPL III consisting of a microprocessor or the like, which performs human output to each controlled member via an input/output port 12, thereby controlling the entire sewing machine apparatus.

In the input/output port 12, an X-direction motor 17 and an X-direction motor 18 for controlling the feed table 4 correspond to the X-direction smoke 41.

The sewing machine motor 19 drives the main shaft of the sewing machine, and is connected to the input/output port 12 via a main shaft motor driver 22 . Synchronous control of the X-direction motor 17, the X-direction motor 18, and the sewing machine motor 19 is performed by the CPU II.

Furthermore, the input/output port 12 includes a sensor 23 for feedback control consisting of optical sensors and other sensors installed in each part of the sewing machine, and a sensor 23 for outputting sewing data to/from external equipment or for storing sewing patterns. A floppy disk drive 24 and a start key 26 for starting sewing are connected. The floppy disk drive 24 is a floppy disk drive 24.
5 is used as a storage medium.

The human output port 12 controls each section or inputs data from each section by inputting and outputting digital data to each section. For example, the X-direction motor drivers 21 and 22 control the motors by converting digital data into analog data such as voltage and current necessary for driving the motors and outputting the analog data to each motor.

A memory 13 consisting of RAM (or ROM), etc. is connected to the CPU II, and this memory 13 stores pulse output timing when driving the X-direction motor 17 and the X-direction motor 18 in one direction or in a child direction. A child direction pulse table 14 and a unidirectional pulse table 15 are included.

The pulse output timing stored in the + direction pulse table 14 and the unidirectional pulse table 15 is determined when a certain cloth feed amount is set in the drive system using the X direction motor 17 and the X direction motor 18 configured as shown in FIG. It is predetermined in advance so that the movement of the feed table can be achieved at the same timing, regardless of whether the feed table is in one direction or in the child direction, and regardless of the position of the feed table.

In the case of the drive system shown in FIG. 4, the timing belt length p1. J2 will have different values. For example, feed platform 4
is located near the right end, and when the feed base 4 is moved leftward from there, the timing belt length J1c is decreased, while when it is moved rightward, the timing belt length 31 is increased. The timing belt 42 length "2" changes with the opposite sign.

Here, for example, FIG. 4 shows a drive system in the y-axis direction,
Assume that the origin of the y-axis exists on the left end side of the figure, and consider movement of the feed base 4 in one direction.

Assuming that there is a dynamic characteristic during driving, for example, the larger the value of 1 is, the earlier the step pulse is required as the output timing of the pulse motor 41, the one-way pulse table 15 has the y Store table data in which the coordinate values and the number of pulses are in a direct proportional relationship.

If the dynamic characteristics regarding the movement in the + direction are the opposite characteristics as described above, the data stored in the child direction pulse table 14 is as follows.
Table data such that the y-coordinate value of the feed table 4 and the number of pulses are inversely proportional to each other will be stored.

+ direction pulse table 14, unidirectional pulse table 15
are referred to from coordinate axis data in the y- or x-axis direction, respectively, and are configured so that the pulse output timing of the corresponding pulse motor can be read out.

Note that if the drive systems for the xJ and y axes have similar characteristics, it is sufficient to provide one child direction pulse table 14 and one direction pulse table 15 that are shared by each axis. However, if the characteristics of the drive system for the xJ5 and y-axes are different, the child direction pulse table 14 and the unidirectional pulse table 15 for the drive system of each axis are
will be established.

Furthermore, the above dynamic characteristics are merely examples, and it is sufficient to create an appropriate sub-directional pulse table 14 and one-directional pulse table 15 depending on what kind of mechanism the drive system is constructed of.

FIG. 2 shows an example of a CPU II control procedure.

In step S1 in FIG. 2, sewing data is read from the floppy disk 25 loaded in the floppy disk drive 24, and
Expand to.

In step S2, the sewing machine moves to the sewing start point according to the read sewing data.

In step S3, the process waits until the start switch 26 is pressed.

In step S4, the X-direction motor 17, the X-direction motor 1
8. Start the sewing machine motor 19.

In step S5, the value of a counter n configured on the memory or register is reset to 0.

In step S6, the counter is incremented, and in step S7, the sewing data is read out by using the counter value as an address offset.

It is assumed that this sewing data is sewing data for the n-th stitch, and that the sewing data includes at least information regarding the sewing direction.

In step S8, the process moves to step S9 or step S10 depending on whether the sewing direction of the sewing data is + or -.

In step S9, the child direction pulse table 14 is referred to in accordance with the current coordinate position in the y- or X-axis direction, and an appropriate number of driving pulses in the child direction of the X-direction motor 17 or the X-direction motor 18 is read out.

The current X or Y coordinate can be determined by coordinate calculation from the sewing start position and sewing pattern data.

Similarly, in step SIO, the one-way pulse table 15 is referred to according to the current coordinate position in the y- or X-axis direction, and
An appropriate number of driving pulses in one direction of the direction motor 17 or the y-direction motor 18 is read out.

In step Sll, the number of pulses determined in steps S9 and S10 is output to the input/output port 12. The human output boat 12 transfers this pulse number data to the X direction motor driver 20.
．． The X-direction motor drivers 20 and 21 drive the X-direction motor 17 and the X-direction motor 18 according to the pulse number data.

In step S12, it is determined whether all the sewing data have been processed, and if the processing has not been completed, step S6
Repeat the process from.

According to the above configuration, a memory table is provided which stores appropriate drive timings of the drive motors in accordance with the dynamic characteristics of the cloth feeding mechanism, which differ depending on the positive or negative cloth feeding (N) direction. Since the cloth feeding drive is controlled according to the contents of this table, accurate sewing can be performed without misalignment.

[Effects of the Invention] As is clear from the above, according to the present invention, the fabric is moved in the forward and reverse directions along at least one coordinate axis in synchronization with the seam forming means and based on the driving force of the predetermined driving means. In a sewing machine device having a cloth feeding mechanism for feeding, the driving means is appropriately driven in accordance with the dynamic characteristics of the cloth feeding mechanism depending on each of the forward and reverse directions of cloth feeding along the coordinate axis. A configuration is adopted in which a memory table in which the amount is stored and a cloth feed control means for driving the driving means using the drive amount obtained by referring to the contents of this memory table in the forward and reverse directions of cloth feed are adopted. Therefore, the cloth feeding means can be driven with an appropriate amount of drive in accordance with the dynamic characteristics of the cloth feeding mechanism that depend on these directions, respectively, in the forward and reverse directions of cloth feeding, and the It is possible to provide an excellent sewing machine device that can drive a cloth feeding device with appropriate characteristics, perform accurate sewing without any seams, and can sew products of good quality.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing the control system of the sewing machine device of the present invention, FIG. 2 is a flowchart showing the control procedure of the CPU in FIG. 1, and FIG. 3 is a perspective view of the cloth feeding mechanism of the sewing machine device. FIG. 4 is an explanatory diagram of the cloth feeding mechanism drive system. 1--One cloth presser device 2-Needle 3--Stitch forming mechanism 4--Feed base 11--
CPU 12...-Person output port 13...Memory 14--Sub direction pulse table 15--One-way pulse table 16...Pattern shape data 17...X direction motor 18-...Y direction motor 19・
...Sewing machine motor 20...-X direction motor driver 21...-X direction motor driver 22...Sewing machine motor driver 23...Sensor 24...Floppy disk drive 25...-Floppy disk 26-...Start Switch 41... Pulse motor 42 - Timing belt 43... - Sprocket Is it unusual for moxibustion? Figure 4 of 1112 and n.

Claims (1)

[Claims] 1) In a sewing machine device having a cloth feeding mechanism that feeds the cloth in forward and reverse directions along at least one coordinate axis based on the driving force of a predetermined driving means in synchronization with the seam forming means, A memory table is provided in which drive timings of the drive means appropriate for the forward and reverse directions of cloth feeding are stored in accordance with the dynamic characteristics of the cloth feeding mechanism depending on these directions, and the contents of this memory table are stored in the cloth feeding direction. 1. A sewing machine apparatus comprising cloth feed control means for driving the driving means using drive timing obtained by referring to the forward and reverse directions of the sewing machine.