JP3654075B2 - Perforated sewing machine - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention forms a holed seam on a work cloth having a pair of staggered seams and a pair of tack seams arranged at both ends of the staggered seams, and operates a cutter to make holes in the work cloth. The present invention relates to a hole stitching sewing machine that forms a button hole by cutting between stitches of a stitched stitch.
[0002]
[Problems to be solved by the invention]
Conventionally, as this type of perforated sewing machine, a cloth feed means for feeding a work cloth, a sewing means having a sewing needle to form a stitch on the work cloth, and the cloth feed means and the sewing means are controlled. A sewing control means for forming a hole seam having a pair of zigzag stitches and a pair of bark stitches arranged at both ends of the zigzag stitches on the work cloth; and a predetermined positional relationship with the sewing needle. There is provided a cutting means having a cutter, and a button hole formation control means for operating the cutter to cut the gaps between the stitches of the work cloth to form button holes. ing. In this perforated sewing machine, the sewing control means controls the cloth feeding means and the sewing means to form stitches on the work cloth while feeding the work cloth, and for example, as shown in FIG. 10 (a). A hole seam 80 is formed.
[0003]
FIG. 11 schematically shows a portion of the sewing needle 1, the cutter 2 and the feed base 3 in the hole sewing machine. A cutter 2 is positioned immediately behind the sewing needle 1, and a feed base 3 is positioned below the sewing needle 1 and the cutter 2. The sewing needle 1 is moved up and down and is oscillated with an arbitrary swing width in the lateral direction (left and right direction). When the sewing machine is in operation, the sewing needle 1 is moved up and down, and the feed base 3 is fed forward and the work cloth 4 is fed forward while swinging, so that as shown in FIG. A part of the tack seam 80a is sewn, and then the left zigzag seam 80b and the back tack seam 80c are sewn, and the work cloth 4 is returned in the reverse direction while the right zigzag seam is sewn. 80d and the other portions of the front side tacking seam are sewn in order to form a hole seam 80. This needle stop position P0 exists above the front end of the front side tacking seam 80a in the work cloth 4. Thereafter, by operating (lowering and raising) the cutter 2, the gap between the stitches of the hole stitch 80 is cut to form the button hole 81.
[0004]
Here, the distance L1 between the needle 1 and the cutter 4 that is the distance between the sewing needle 1 and the cutter 4 is normally set to 2.2 mm or less because the sewing needle 1 is held by the needle bar 1a. is there. Now, when the distance L1 between the needle and the cutter is 2.2 mm, if the length dimension A of the tacking stitch 80a is 1.7 mm, for example, the inner end Ua of the tacking portion 80a, The barbed seam / hole distance B between the end 81b of the button hole 81 is 0.5 mm. The above-mentioned distance between the tack seam and the hole B is about 0.5 mm as described above. The length Lc of the cutter 2 is set in advance to the length C of the button hole 81 to be formed.
[0005]
By the way, as shown in FIG. 10B, when the length A of the tacking seam 90a is as short as 1.2 mm, for example, when the cutter 2 is operated at the stitching position P0 after the end of sewing, The distance B between the holes is 1.0 mm, which is larger than an appropriate value (in this case, 0.5 mm). That is, in the case of adopting the so-called post cutter method in which the button hole is formed after the end of the hole stitching as described above, the length of the tacking stitch 80a is limited by the distance L1 between the needle and the cutter. There was a problem that the length A of the stop stitch 80a could not be formed so short.
[0006]
The present invention has been made in view of the above circumstances, and its purpose is not to be limited by the distance between the needle and the cutter, and the button hole can be formed at an arbitrary position. The object of the present invention is to provide a sewing machine that can increase the degree of freedom.
[0007]
[Means for Solving the Problems]
[0008]
[0009]
[0010]
[0011]
[0012]
The over-stitch sewing machine according to claim 1
A cloth feed means for feeding a work cloth having a feed base that can reciprocate only in one side region from the initial position;
Sewing means having a sewing needle to form stitches on the work cloth;
Sewing control for controlling the cloth feeding means and the sewing means to form a holed seam having a pair of staggered seams and a pair of tack seams arranged at both ends of the staggered seams on the work cloth. Means,
Cutting means having a cutter provided in a predetermined positional relationship with the sewing needle;
In a hole sewing machine comprising a button hole formation control means for operating a cutter of this cutting means to cut a gap between stitches of a work cloth to form a button hole,
The sewing control means performs a hole sewing in the one side region from a state where the feed base is fed in a predetermined distance from the initial position into the one side region,
The button hole formation control means is configured to dispose the work cloth when a separation distance between a needle stop position of a barbed portion and a button hole formation position in the hole stitch is shorter than a separation distance between a sewing needle and a cutter. It is characterized in that the cutting means is operated after returning the required distance in the direction of the initial position.
[0013]
The buttonhole stitching sewing machines, sewing control means executes the buttonhole stitching in the one side region of the feed table from a preset distance sent state from the initial position to one side region, is buttonhole formation control means The work cloth is returned to the initial position direction when the separation distance between the needle stop position of the tacking portion and the button hole formation position at the hole stitch is shorter than the separation distance between the sewing needle and the cutter. After that, since the cutting means is operated, the position where the button hole is to be formed at the end of sewing is determined even though the feed base is configured to reciprocate only in one region from the initial position. Even if the position of the cutter does not match, the button hole can be formed at the required position.
[0014]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, a first embodiment of the present invention will be described with reference to FIGS. In FIG. 2, a hole sewing machine 11 receives various data for forming a sewing machine motor 13, a pedal 14 for starting or stopping the sewing machine motor 13, a hole stitch, and a button hole on a sewing machine table 12. There are provided an operation panel 15 for inputting, a control box 16a and the like in which a control device 16 (see FIG. 5) for performing drive control of each unit described later is provided.
[0015]
The perforated sewing machine sewing machine 11 has a bed portion 17, a leg portion 18, and an arm portion 19, and, as shown in FIG. 3, a cloth feeding mechanism 20 as a cloth feeding means for feeding a work cloth, and a work cloth. A sewing mechanism 21 as a sewing means for forming a seam and a cutting mechanism 22 as a cutting means are provided.
The cloth feed mechanism 20 includes a feed base 23 movably provided on the bed portion 17 and a feed stepping motor 24 (see FIG. 5) for driving the feed base 23. Now, when the feed base 23 is at the initial position in FIG. 3 (home position after the start-up of the control device 16), for example, a virtual part directly below a sewing needle 27 described later is placed on the feed base 23 on the feed base 23. When the reference point K23 is set, the feed base 23 can move in the forward direction F and can move in the backward direction from the movement limit position F0. That is, the reference point K23 is located in front of the needle down position and the front position. It can be moved back and forth back and forth in the area between the movement limit position F0 and the front area Ef (one side area). Further, the feed base 23 can move the reference point K23 in the backward direction R from the initial position, and can move in the forward direction from the movement limit position R0. That is, the reference point K23 is in the needle-down position. And the rearward movement limit position R0, that is, the rear region Er (the other region) can also reciprocate. In this case, the reciprocable distance in the rear region Er may not be so long. A cloth presser 25 for pressing and fixing the work cloth on the feed base 23 is provided above the feed base 23.
[0016]
The sewing mechanism 21 includes a sewing needle 27 attached to a needle bar 26, the sewing machine motor 13 for moving the sewing needle 27 up and down, and a needle stepping motor 28 for displacing the sewing needle 27 left and right (see FIG. 5). Reference). In this case, the swing width of the sewing needle 27 can be changed.
The cutting mechanism 22 includes a cutter 31 that is located on the rear side of the sewing needle 27 and is provided via a holder 30, and a cutter solenoid 32 that moves the cutter 31 up and down via the holder 30 (see FIG. 5). ). Now, as shown in FIG. 4, the separation distance L1 between the sewing needle 27 and the front end 31a of the cutter 31 is, for example, 2.2 mm.
[0017]
FIG. 5 shows the control device 16. The control device 16 is constituted by a microcomputer having a CPU 16a, a ROM 16b, and a RAM 16c as main parts, an input interface 16d to which a signal corresponding to the operation state of the pedal 14, a signal from the operation panel 15 and the like are input, and a sewing machine motor 13, an output interface for outputting a drive signal to the feed stepping motor 24, the needle stepping motor 28, and the cutter solenoid 32 via a drive circuit (not shown) and also outputting a control signal such as a display state to the operation panel 15. 16e, which are connected by a bus 16f.
[0018]
As shown in FIG. 2, the operation panel 15 includes a display unit 33, a parameter selection switch 34, an up numerical setting switch 35a, a down numerical setting switch 35b, and the like. The parameter selection switch 34 has the length A of the tacking seams 80a and 80c shown in FIG. 7A, the tacking seam between the inner end Ua of the tacking portion 80a and the end 81a of the button hole 81. One of the parameters among the distance B between the holes, the length C of the button hole 81, the length D of the staggered stitches 80b and 80d, and the like is selected.
[0019]
The up numerical value setting switch 35a inputs numerical values (mm) in the increasing direction for the selected parameters A to D, and the down numerical value setting switch 35b conversely inputs in the decreasing direction.
In the present embodiment, the cutter 31 is set to match the length C of the button hole 81.
[0020]
The control device 16 stores a needle / cutter distance L1 and a program for operating the sewing machine in the ROM 16b. This program includes a function as a sewing control means for controlling the cloth feed mechanism 20 and the sewing mechanism 21 to form a hole stitch, and also controls the position of the cutter 31 by controlling the cloth feed mechanism 20. A function as a button hole formation control means for performing adjustment and controlling the cutting mechanism 22 to form the button hole 81 is also included.
[0021]
When the parameter is selected, a numerical value is input, the cutter 31 is set, and the pedal 14 is depressed, the control device 16 executes the process shown in the flowchart of FIG. In step S1, the input parameters and numerical values are read into a predetermined area of the RAM 16c, and the feed base 23 is controlled to the initial position. That is, control is performed so that the reference point K23 is in the needle down position. In step S3, a needle drop point corresponding to the input value is calculated. In this case, the needle stop position P0 after sewing is also calculated. This needle stop position P0 corresponds to the reference point K23 at the initial position.
[0022]
Next, in step S5, the operating position of the cutter 31 is calculated. In this case, the following calculation process is performed. That is, first, the barbed seam / hole distance B is compared with the needle / cutter distance L1, and the separation distance L2 between the needle fastening position P0 and the end 81a of the button hole 81 is the distance between the needle / cutter. When the distance is shorter than the distance L1, the difference (adjustment value) ΔL between the distances L2 and L1 is calculated. Note that ΔL is zero when the distances L2 and L1 are equal. Further, when the separation distance L2 is larger than the needle-cutter distance L1, another calculation process is performed as before to form a buttonhole in the middle of sewing, and description thereof will be omitted. .
[0023]
In step S7, the sewing mechanism 21 and the cloth feed mechanism 20 are controlled so that the sewing needle 27 is dropped at each needle drop point calculated in step S3, thereby forming a hole stitch 80. In this case, while controlling the movement of the feed base 23 so that the reference point K23 is displaced in the front direction F, a part of the front tack seam 80a is started to be sewn, and then the left zigzag seam 80b, The rear side tacking seam 80c is sewn, and the feed base 23 is moved and controlled so that the reference point K23 is displaced in the direction opposite to the front direction F, while the right zigzag stitch 80d and the front side tacking seam 80c are controlled. The remaining portions of the eyes 80a are formed in order to form the hole stitch 80.
[0024]
Thus, the feed base 23 is reciprocated in the front region Ef, and the hole sewing is performed. When this sewing is finished, the needle stop position P0 corresponds to the reference point K23.
At this time, as shown in FIGS. 1 and 7B, the cutter 31 is positioned rearward by ΔL from the button hole to be formed.
[0025]
Thereafter, in step S9, the cloth feed mechanism 20 is controlled so that the work cloth 4 is fed to the rear side region Er by the above-described adjustment value ΔL (required distance). Thereby, in the work cloth 4, the position of the button hole to be formed reaches directly below the cutter 31.
Thereafter, the button 2 is formed between the stitches of the hole stitch 80 by operating (lowering and raising) the cutter 2.
[0026]
As described above, according to this embodiment, when the separation distance L2 between the needle stop position P0 and the end 81a of the button hole 81 is shorter than the needle-cutter distance L1, the cloth feed mechanism 20 is controlled. Since the work cloth 4 is sent to the rear side region Er, that is, as can be seen from FIG. 1, along the forming direction of the pair of staggered stitches 80 b and 80 d and to the cutting position side by the cutter 31, Since the hole forming position can be adjusted to a position corresponding to the cutter 31, and then the cutting mechanism 22 is controlled to form the button hole 81, the needle stop position / button hole distance L2 is Even when the distance between the cutters L1 is shorter, the button hole 81 can be formed at a required position. As a result, the degree of freedom of the length A of the tacking seam 80a can be increased.
[0027]
In particular, according to the present embodiment, the feed base 23 can be moved back and forth in the front region Ef, and can also be moved back and forth in the rear region Er, so that sewing from the initial position in the front region Ef and thereafter It is possible to carry out hole stitching and button hole formation by a simple procedure such as cutting in the rear region Er.
Next, FIG. 8 and FIG. 9 show a second embodiment of the present invention. In this embodiment, the feed base 23 has its reference point K23 as a needle down position and a forward movement limit position F0. It is set as the structure which can be reciprocated back and forth only in the area | region between, ie, the front side area | region Ef. In this case, as shown in FIG. 9, the reference point of the feed base 23 at the initial position is indicated by a symbol K23 ′. From this position, the control device 16 moves the feed base 23 so that the reference point K23 is displaced into the front region Ef by the set distance Lp, and executes the hole stitching from this position. At this time, if the separation distance L2 between the needle stop position P0 and the button hole formation position is shorter than the separation distance L1 between the sewing needle and the cutter as shown in FIG. 23 is returned to the initial position direction, and the cutter 31 is operated to form a button hole. The set distance Lp only needs to be greater than or equal to ΔL.
[0028]
According to the second embodiment, the position where the button hole should be formed at the end of sewing and the position of the cutter 31 while the feed base 23 can move back and forth only in the front region Ef from the initial position. A button hole can be formed at a required position even if does not match.
Further, in this way, the control for executing the sewing and cutting after feeding the feed base 23 into the front area Ef for the set distance Lp in advance is such that the feed base 23 reciprocates in both the front area Ef and the rear area Er. You may make it perform in the case of a possible structure.
[0029]
【The invention's effect】
As is apparent from the above description, the sewing control means executes the hole sewing in the one side region from the state where the feed base has been fed a predetermined distance from the initial position into the one side region, and the button hole The formation control means moves the work cloth toward the initial position when the separation distance between the needle stop position of the tacking portion and the button hole formation position at the hole stitch is shorter than the separation distance between the sewing needle and the cutter. Since the cutting means is operated after returning the required distance, a button hole is formed at the end of sewing even though the feed base can be reciprocated only in one side region from the initial position. It is possible to form a button hole at a required position even if the position to be cut does not match the position of the cutter.
[Brief description of the drawings]
FIG. 1 is a perspective view of a sewing needle, a cutter, and a hole stitching portion before forming a button hole in the first embodiment of the present invention. FIG. 2 is a perspective view of a hole stitching machine. [Fig. 4] Side view of sewing needle, cutter and feed base [Fig. 5] Block diagram showing electrical configuration [Fig. 6] Flow chart showing control contents [Fig. 7] (a) is a hole stitch after completion FIG. 8B is a plan view showing a stitched seam after sewing and before forming a button hole. FIG. 8 is a view corresponding to FIG. 3 showing a second embodiment of the present invention. FIG. 10 is a plan view showing a hole seam before formation. FIG. 11 is a plan view showing a conventional hole seam. FIG. 11 is a diagram corresponding to FIG.
11 is an over-stitch sewing machine, 16 is a control device (sewing control means, button hole formation control means), 20 is a cloth feed mechanism (cloth feed means), 21 is a sewing mechanism (sewing means), and 22 is a cutting mechanism (cutting means). ) 23 is a feed base, 26 is a needle bar, 27 is a sewing needle, 31 is a cutter, 80 is a holed stitch, 80a and 80c are barbed stitches, and 81 is a button hole.

Claims (1)

A cloth feed means for feeding a work cloth having a feed base that can reciprocate only in one side region from the initial position;
Sewing means having a sewing needle to form stitches on the work cloth;
Sewing control for controlling the cloth feeding means and the sewing means to form a holed seam having a pair of staggered seams and a pair of tack seams arranged at both ends of the staggered seams on the work cloth. Means,
Cutting means having a cutter provided in a predetermined positional relationship with the sewing needle;
In a hole sewing machine comprising a button hole formation control means for operating a cutter of this cutting means to cut a gap between stitches of a work cloth to form a button hole,
The sewing control means performs a hole sewing in the one side region from a state where the feed base is fed in a predetermined distance from the initial position into the one side region,
The button hole formation control means is configured to dispose the work cloth when a separation distance between a needle stop position of a barbed portion and a button hole formation position in the hole stitch is shorter than a separation distance between a sewing needle and a cutter. A hole sewing machine characterized in that the cutting means is operated after a required distance is returned in the direction of the initial position.

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