JP3760520B2 - Hole sewing machine - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a boring sewing machine that can form a desired boring seam on a work cloth set on a feeding base by driving a feed base and turning a needle bar by an electric motor. .
[0002]
[Prior art]
Conventionally, in this type of hole sewing machine, a lower knife is provided at a position a predetermined distance behind the needle bar, and a punching hammer that contacts and separates from above the lower knife can swing. Is provided. When the work cloth is set on the feed base and the start switch is pressed, a distance is formed by subtracting the sewing length from the predetermined distance after forming a hole in the work cloth by the cooperation of the lower knife and the hammer. The feed base moves by the minute and the sewing machine starts. After that, in synchronism with the vertical movement of the needle bar, the movement of the feed base and the rotation of the needle bar are performed by a predetermined amount so that a desired hole seam can be formed. In this case, the needle bar moves up and down while alternately repeating the left and right swing positions.
[0003]
[Problems to be solved by the invention]
However, in the above-described hole sewing machine, when changing the stitch width, it is necessary to adjust the left / right swing width of the needle bar. There were problems such as lowering.
[0004]
The present invention has been made to solve the above-described problems, and an object thereof is to provide a boring machine capable of changing the stitch width with a simple operation even if it is not a skilled engineer. It is in.
[0005]
[Means for Solving the Problems]
In order to achieve this object, the boring machine according to claim 1 includes a boring mechanism that forms a hole in the work cloth by the cooperation of a lower knife and a hammer, and the feed base when the needle bar is raised. A feed mechanism that feeds and moves, a drive mechanism that simultaneously drives the needle bar and the looper so as to repeat a seam forming operation for forming a seam on the work cloth by the cooperation of the sewing needle and the looper, and a rotational force of the spindle of the sewing machine Is transmitted by a cam mechanism, and a swing mechanism that swings the needle bar left and right by a predetermined swing width , a looper base provided with the looper and a rotation mechanism that rotates the needle bar, In a boring machine provided with a control device for controlling the drive mechanism, the feed mechanism, and the rotation mechanism based on stitch data specifying the feed amount of the feed base and the rotation angle of the needle bar and the looper base, Seam width correction value input means for correcting the stitch width determined by the swinging width of the needle bar, and seam data correction for correcting seam data based on the seam width correction value input by the seam width correction value input means and means, which is constituted so as to correct the stitch width without changing the swing width of the needle bar.
[0006]
The operation will be described. The seam data correction means is based on the seam width correction value input by the seam width correction value input means, among the seam data consisting of X [j], Y [j], and θ [j]. X [j] and Y [j] are corrected. j (= 1, 2, 3...) is the needle number. After the hole is made by the hole making mechanism, the control device controls the drive mechanism, the feed mechanism, and the rotation mechanism based on the stitch data corrected by the stitch data correcting means. As a result, a stitched seam having a stitch width obtained by adding a desired correction value to a predetermined stitch width is formed on the work cloth.
[0007]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described below with reference to the drawings.
[0008]
As shown in FIG. 1, the perforated sewing machine M is configured by integrally including a bed portion 1 having a substantially rectangular box shape and an arm portion 2 that continuously extends forward from the upper portion of the rear portion thereof. 16 is mounted. The sewing machine table 16 includes a sewing machine motor 24 (see FIG. 3) serving as a drive source of a drive mechanism for synchronously driving the needle bar 4 and the looper 6a (see FIG. 2), and holes such as chrysanthemum hole diameters as described later. There are provided an operation panel 23 for setting basic data for over stitch sewing, a foot-operated start switch 20 and the like. Further, as will be described later, a control device 35 comprising a microcomputer for controlling the operation of each mechanism is provided. Is provided.
[0009]
A needle bar 4 having a sewing needle 3 is provided at the lower end of the tip of the arm portion 2 so as to be vertically movable. Although not shown in detail, the rotational force of the main shaft 5 that is rotated by driving of the sewing machine motor 24 is a cam. It is transmitted by the mechanism and is driven up and down while swinging left and right by a predetermined width. In this case, one rotation of the main shaft 5 causes the needle bar 4 to move up and down twice between the left swing position and the right swing position. Further, the bed portion 1 is provided with a looper base 6 having two loopers 6a so as to face the needle bar 4, and these two loopers 6a rotate the main shaft 5 via a cam mechanism (not shown). Thus, the needle bar 4 is driven in time with the vertical movement.
[0010]
Further, the needle bar 4 and the looper base 6 are respectively placed in a horizontal plane by a rotating mechanism (corresponding to a rotating means) 8 comprising a θ direction drive motor 26 comprising a stepping motor and a gear mechanism 7 provided in the bed portion 1. In FIG. 1, the rotation is integrally performed around the vertical axis.
[0011]
The bed portion 1 is provided with a lower knife 9 which is fixedly disposed on the rear side of the looper base 6, and a punching hammer 10 which comes in contact with and separates from the upper knife 9 from above is swingable. Is provided. The hammer 10 is driven by a hammer drive mechanism 12 including an air cylinder 11 (see FIG. 3) provided in the bed portion 1, and the chrysanthemum hole as shown in FIG. 6 is formed in cooperation with the lower knife 9. It is designed to be formed on a work cloth.
[0012]
A feed base 13 on which a work cloth is set is provided on the upper surface of the bed 1. The feed base 13 has a thin rectangular box shape as a whole, and portions of the lower surface corresponding to the looper base 6 and the lower knife 9 are open. Further, as shown in FIG. 2, a metal cross plate 14 having an opening 14 a is provided on the upper surface of the feed base 13. In the bed 1, an X-direction moving mechanism (not shown) that moves the feed base 13 in the X direction (left and right direction) by driving an X direction drive motor (corresponding to an electric motor) 30; A Y-direction moving mechanism (not shown) that moves in a Y-direction (front-rear direction) orthogonal to the X-direction by driving a Y-direction drive motor (corresponding to an electric motor) 32 is provided. A cloth presser (not shown) is provided on the cross plate 14 to hold the work cloth on both the left and right sides of the opening 14a.
[0013]
Next, an outline of the control system of the boring machine M will be described based on the block diagram of FIG.
[0014]
The control device 35 of the sewing machine M includes a microcomputer including a CPU 36, a ROM 37, and a RAM 38, and an input interface 40 and an output interface 41 connected to the microcomputer via a bus 39 such as a data bus. The start switch 20, the presser foot switch 21 connected to the presser foot, the timing signal generator 22, and a signal from the operation panel 23 are input to 40.
[0015]
From the output interface 41, a drive circuit 25 for the sewing machine motor 24, a drive circuit 27 for the θ-direction drive motor 26, and an electromagnetic switching valve 28 for driving the air cylinder 11 provided in the hammer drive mechanism 12. In addition to the drive circuit 29 for the X direction drive motor 30, the drive circuit 31 for the Y direction drive motor 32, and the drive circuit 33 for the Y direction drive motor 32, a drive signal and a drive pulse signal are output to each of the operation panels 23. Is done. Here, the X-direction drive motor 30 and the Y-direction drive motor 32 are each composed of a stepping motor. The timing signal generator 22 is connected to the main shaft 5 of the sewing machine M, detects the rotational phase of the main shaft 5 and outputs a phase signal.
[0016]
The ROM 37 stores a drive control program for controlling the sewing machine motor 24, the various motors 26, 30, 32, and the electromagnetic switching valve 28, a control program for boring sewing control that will be described later, and the like. The RAM 38 is provided with various memories, buffers, and the like in addition to the stitch data memory 38a for storing the created stitch data of the hole stitch.
[0017]
Next, on the operation panel 23, as shown in FIG. 4, “chrysanthemum hole diameter”, “number of one-round stitches”, “number of overlapped stitches” as basic data for sewing of a hole stitch, The item name for inputting “stitch width correction” is described. Select key 23b for sequentially switching the input of these numerical values for each item, LED for displaying the numerical value input for each item A display 23a, a numerical value up key 23c for changing the input numerical value to the increasing side, and a numerical value down key 23d for changing to the decreasing side are provided, and each item is lit to indicate that it has been selected. Display lamps 23e to 23h for instructing are provided.
[0018]
Next, FIG. 6 shows a standard chrysanthemum seam before seam width correction. At this time, it is assumed that the mechanism is adjusted so that the stitch width, that is, the swinging width of the needle bar 4 becomes W. A procedure for correcting such a seam to change the seam as shown in FIG. 7 will be described with reference to the flowchart of FIG. However, the symbol Si (i = 10, 11, 12,...) In the figure represents each step. It is assumed that basic data for sewing is set by operating the operation panel 23 before the flowchart is started. Here, the chrysanthemum hole diameter is “A”, the number of one-round stitches is “B”, the number of overlap stitches is “C”, and the stitch width correction is “D”.
[0019]
First, while the main shaft 5 makes one revolution for each number of stitches, the stitches of the sewing needle 3 are formed at the left swing position (the needle drop position of the inner needle) and the right swing position (the needle drop position of the outer needle). Therefore, the rotation angle T corresponding to the number of half stitches for sequentially sewing the inner needle and the outer needle is obtained by the arithmetic expression T = 360 ° / 2B (S10). Next, an initial value “1” is set as the needle number j (S11). In S12 and S13, the needle drop position of the inner needle and the needle drop position of the outer needle are obtained by calculation for each stitch number j.
[0020]
Here, in the needle drop position calculation, as shown in FIG. 7, the origin is the center G of the chrysanthemum part CD having a diameter A set corresponding to the outer peripheral part of the circular chrysanthemum CH. The needle drop position is obtained assuming the -Y coordinate. Further, the needle drop position of the inner needle at each stitch number is indicated by <1>, <2>, <3>... The needle drop position of the outer needle at each stitch number is represented by (1), (2). , (3)
[0021]
That is, in the calculation of the needle drop position of the inner needle in S12, the needle drop position X <j> in the X direction corresponding to the needle number number j is calculated by the equation X <j> = (A ÷ 2) × cos {(2j− 2) The needle entry position Y <j> in the Y direction corresponding to the needle number j is obtained by the equation Y <j> = (A / 2) * sin {(2j-2) * T }, And the rotation angle θ <j> of the needle bar 4 corresponding to the needle number number j is obtained by an arithmetic expression θ <j> = (2j−2) × T. X <j>, Y <j>, and θ <j> are stored in the stitch data memory 38a as the needle drop position data of the inner needle corresponding to the stitch number number j.
[0022]
On the other hand, in the needle drop position calculation of the outer needle in S13, the needle drop position X (j) in the X direction corresponding to the stitch number number j is calculated by the equation X (j) = ((A / 2) + D) × cos { The needle drop position Y (j) in the Y direction corresponding to the stitch number number j, obtained by (2j-1) × T}, is expressed by the equation Y (j) = ((A ÷ 2) + D) × sin {( 2j−1) × T}, and the rotation angle θ (j) of the needle bar 4 corresponding to the needle number j is determined by the equation θ (j) = (2j−1) × T. . X (j), Y (j), and θ (j) are stored in the stitch data memory 38a as needle drop position data of the outer needle corresponding to the stitch number number j.
[0023]
Next, when the number of stitches j is equal to or less than the total number of stitches obtained by adding the number of overlapped stitches C to the number of round stitches B (S14: YES), the number of stitches j is incremented by 1 (S15: J = J + 1). , S12 to S15 are repeated, and the needle drop position of the inner needle and the needle drop position of the outer needle are obtained for each needle number j. Then, the needle drop positions corresponding to the total number of stitches are obtained, and when the number of stitches j is equal to the total number of stitches (S14: NO), this flowchart is ended.
[0024]
Next, the hole stitching process will be described. First, the work cloth switch 21 is operated to set the work cloth on the feed table 13. Next, the start switch 20 is operated. Then, after the chrysanthemum hole is formed in the work cloth by the cooperation of the hammer 10 and the lower knife 9, the feed base 13 moves to the sewing start position based on the stitch data stored in the stitch data memory 38a. When the feed base 13 moves to the sewing position, the sewing machine motor 24 is activated to start sewing. Thereafter, the X-direction drive motor 30 and the Y-direction drive are based on the stitch data including the X-direction needle drop position X (j), the Y-direction needle drop position Y (j), and the rotation angle θ (j) for each stitch. The motor 32 and the θ direction drive motor 26 are driven in time. When the sewing of the last needle is finished, the sewing machine motor 24 is stopped and the presser foot is turned off. Then, the feed base 13 returns to the position where the work cloth is set.
[0025]
In this way, a seam having a seam width corrected from W to W + D, that is, a seam as shown in FIG. 7 is formed.
[0026]
In the above-described embodiment, the seam width is corrected simultaneously with the creation of the stitch data in order to make the explanation easy to understand. However, the stitch data may be corrected in advance.
[0027]
That is, X (j) = X (j) + Dcos {(2j-1) * T}
Y (j) = Y (j) + Dsin {(2j-1) * T}
The same result can be obtained with the above two arithmetic expressions. Further, regarding the shape of the hole, in the above embodiment, the chrysanthemum hole sewing is shown as an example. However, with respect to the above embodiment, existing techniques and those skilled in the art can be applied to the eyelet hole sewing and the sleep hole sewing. Various modifications may be made based on obvious techniques.
[0028]
【The invention's effect】
As is clear from the above description, according to the boring machine according to claim 1, the seam width correction value input means for correcting the seam width determined by the swinging width of the needle bar, and the seam width correction value. Since the stitch data correction means for correcting the stitch data based on the stitch width correction value input by the input means is provided so as to correct the stitch width without changing the swinging width of the needle bar. Even if it is not a person, it has the outstanding effect that a stitch width can be changed by simple operation.
[Brief description of the drawings]
FIG. 1 is a side view of a drilling machine according to an embodiment of the present invention.
FIG. 2 is a partial plan view of a feed base for a boring machine.
FIG. 3 is a block diagram of a control system for a boring machine.
FIG. 4 is a plan view of an operation panel.
FIG. 5 is a flowchart illustrating a procedure for creating stitch data.
FIG. 6 is an explanatory diagram for explaining a seam of a chrysanthemum overhang before correction.
FIG. 7 is an explanatory diagram for explaining a corrected seam of a chrysanthemum hole.
[Explanation of symbols]
4 sewing machine body 7 sewing needle 8 needle bar 10 sewing machine motor 16 controller 17 looper base 21 rotation mechanism 25 feed base 26 X-axis pulse motor 27 Y-axis pulse motor 28 feed mechanism

Claims (1)

For the work cloth set on the feed base, overlock sewing is performed.
A punching mechanism for forming a hole in the work cloth by the cooperation of the lower knife and the hammer;
A feed mechanism that feeds and moves the feed base when the needle bar is raised;
A drive mechanism for simultaneously driving the needle bar and the looper so as to repeat a seam forming operation for forming a seam on the work cloth in cooperation with a sewing needle and a looper;
A swinging mechanism in which the rotational force of the main shaft of the sewing machine is transmitted by a cam mechanism, and the needle bar swings left and right by a predetermined swinging width ;
A rotation mechanism for rotating the looper base and the needle bar provided with the looper;
A boring machine provided with a control device for controlling the drive mechanism, the feed mechanism and the rotation mechanism based on stitch data specifying the feed amount of the feed base for each needle and the rotation angle of the needle bar and looper base In
Stitch width correction value input means for correcting the stitch width determined by the swing width of the needle bar;
And a stitch data correcting means for correcting the stitch data based on the stitch width correction value input by the seam width correction value inputting means,
A boring machine characterized in that the stitch width is corrected without changing the swinging width of the needle bar .

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