JPH05277268A - Workpiece transfer device for sewing machine for pattern stitching - Google Patents

Abstract

PURPOSE:To provide a workpiece transfer device for a sewing machine for a pattern stitching, allowing the formation of a proper seam at all times, regardless of a workpiece feed direction with an X-Y shift mechanism. CONSTITUTION:A turntable 5 actuated with a turning motor 7 about the elevation axis L of a stitching needle N is provided with X-Y shift mechanisms 10 and 11 for holding a workpiece. Also, these mechanisms 10 and 11 are intermittently moved in both X and Y directions on the basis of needle location data. In addition, the turning motor 7 is driven with a turning motor control means, so that the forming direction of a seam agrees to a forward feed direction A in parallel to the moment of a rotary hook K at a position faced to the needle thread hole Na of the needle N.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a work transfer device for a pattern sewing machine, and more particularly to a work transfer device provided with an XY moving mechanism for moving a work in the X and Y directions according to a set pattern.

[0002]

2. Description of the Related Art Conventionally, there is a pattern sewing machine in which a work is moved in both X and Y directions by an XY moving mechanism to form a predetermined pattern. As is well known, in this sewing machine, pattern data is formed by setting X and Y coordinates in a work holding unit provided in an XY moving mechanism and sequentially setting needle drop positions on the coordinates. Based on the above, the XY moving mechanism is operated for each needle to move the work piece forward and backward, left and right, or diagonally in parallel to form a predetermined pattern.

[0003]

However, in the conventional technique using the XY moving mechanism, there is a problem that proper stitches may not be formed depending on the conveying direction of the work, and the quality of the sewn product may be deteriorated. It was For example, a direction parallel to the moment of the rotary hook K in the direction A of the work W shown in FIG. 6, that is, a position facing the threading hole Na formed in the sewing needle N (hereinafter, this direction is referred to as a forward feed direction). When the upper thread I1 and the lower thread I2 are conveyed to the position shown in FIG.
As shown in (a), the stitches are properly joined to form a proper stitch with the stitch ends aligned (see FIG. 9 (a)), but the workpiece is moved in the reverse feed direction (B direction) or the tilt direction. When it is moved, as shown in FIG. 8 (b), the upper thread loop is connected with the lower thread in a twisted state, and as shown in FIG. 9 (b), so-called misalignment occurs at the front and rear seam ends. Hitch stitches were sometimes formed. When such a hitch stitch is formed, the appearance of the pattern is significantly impaired, which causes a problem of deterioration in quality, and when the hitch stitch is continuously formed, a thread breakage occurs. There was also a problem that occurred.

The present invention has been made in view of the above problems, and an object thereof is to provide a work transfer device for a pattern sewing machine capable of always forming a proper stitch regardless of the work transfer direction by the XY movement mechanism. And

[0005]

SUMMARY OF THE INVENTION According to the present invention, an XY moving mechanism for holding a work is provided on a turntable which is turned about an ascending / descending path of a sewing needle by driving a turning motor. The stitches are moved intermittently in both X and Y directions based on the needle drop data, and the above-mentioned rotation is performed so that the stitch forming direction coincides with the forward feed direction parallel to the moment of the rotary hook at the position facing the needle thread insertion hole of the sewing needle. The drive motor is driven by the rotation motor control means.

Further, as the rotation motor control means, for example, an arithmetic unit for calculating an angle formed by a stitch to be formed and the normal feed direction, and the rotary base for the angle calculated by the arithmetic unit. A control unit for driving the rotation motor to rotate the motor may be provided.

[0007]

In the present invention, since the XY moving mechanism can be rotated by the rotating base which rotates about the ascending / descending path of the sewing needle, not only the parallel movement in the X and Y directions but also the rotating direction. It is possible to move to. Therefore, even for a pattern that has been required to be conveyed in a direction other than the normal feed direction, the work can be moved only in the normal feed direction by the rotation of the rotary table and the sewing operation can be performed. Generation of stitches can be completely prevented.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT An embodiment of the present invention will be described below with reference to FIGS.
It will be explained based on. 1 and 2, M is a post-type sewing machine, M1 is an arm portion of the post-type sewing machine, and M2.
Is a sewing machine bed. On the upper surface of the sewing machine bed M2, a post M3 that supports the work in sewing a three-dimensional work is erected.
A rotary hook (not shown) that forms a stitch by cooperation with the sewing needle N, a rotation transfer mechanism of the rotary hook, and the like are housed therein.

Reference numeral 1 denotes a mounting base fixed on the sewing machine bed M2 so as to surround the post M3, and an annular rotating bearing 2 centered on the elevating path of the sewing needle N is fixed on the upper surface thereof. Has been done. Reference numeral 3 denotes a rotary pulley attached to the outer peripheral surface of the rotary bearing 2 via a bearing (not shown). The rotary pulley 3 is provided so as to surround the post M3 and is rotatable about the ascending / descending path of the sewing needle. ing.

Reference numeral 4 is a hollow cylindrical tubular body fixed to the upper surface of the rotary pulley 3, and 5 is a rotary base fixed to the upper surface of the cylindrical body 4, and all of these members surround the post. Therefore, it can rotate around the ascending / descending path of the sewing needle together with the rotating pulley 3. The turntable 5 has a rectangular frame shape, and rail portions 5a and 5b are projectingly provided on a pair of side portions thereof. The upper surface of the turntable 5 is a plane orthogonal to the ascending / descending path of the sewing needle N. In this plane, the direction in which the guide portions 5a and 5b extend is the X direction, and the direction orthogonal thereto is the Y direction. The X coordinate and the Y coordinate are set according to both directions as shown in FIG. In addition, (X0, Y0) represents the origin of the coordinates.

A rotating motor 7 is fixed on the mount 1, and a pulley 8 is provided on the rotating shaft. A timing belt 9 is stretched between the pulley 8 and the tubular body 4, and the tubular body 4 is rotated by driving the rotating motor 7 to rotate the pulley 8, and with this, The turntable 5 is adapted to turn.

Numeral 10 is an X moving table provided on the rotary table 5 and has a rectangular frame shape surrounding the post M3. This X-moving table 10 is a rail part 5 of the rotating table 5.
It is attached to the turntable 5 via linear motion bearings 6a and 6b provided on a and 5b, and is movable in the X direction. Further, rail portions 10a and 10b extending in the Y direction are provided in a protruding manner on a pair of side portions of the X moving table 10.

Reference numeral 11 is a Y moving table provided on the X moving table 5. The Y moving table 11 includes a frame-shaped moving section 11a provided on the rails 10a and 10b of the X moving table 10 via a linear motion type bearing (not shown), and a column standing on the moving section 11a. It is composed of a rectangular frame-shaped work support portion 11c held by 11b. Further, the fixed frame 12 can be inserted into and removed from the work supporting portion 11c, and after the work is placed on the work supporting portion 11c, the fixed frame 12 is fitted into the work supporting portion 11c so that the work W is sewn with a needle. The post M3 can be held in a plane (horizontal plane) which is orthogonal to the elevating path and has the same height as the upper surface of the post M3.

The X moving table 10, the Y moving table 11 and the fixed frame 12 constitute an XY moving mechanism.

Further, 13 is an X fixed to the rotary table 5.
It is a motor. A pulley 14 is fixed to a rotating shaft of the X motor 13, and a timing belt 15 is stretched between the pulley 14 and a pulley (not shown) along the X direction. And this timing belt 15
The X-moving base 10 is fixed in place, and the X-moving base 10 can be moved in the X-direction by moving the timing belt 15 along the X-direction by driving the X motor.

Reference numeral 16 is a Y motor fixed to the X moving table 10. A pulley 1 is attached to the rotating shaft of this Y motor.
7 is fixed, a timing belt 18 is stretched between the pulley 17 and a pulley (not shown) along the Y direction, and the Y moving base 11 is fixed to the timing belt 18. Therefore, by driving the Y motor 16 to move the timing belt 18 in the Y direction, the Y moving base 11 moves in the Y direction.

On the other hand, FIG. 3 is a block diagram showing the configuration of the control system circuit in this embodiment. In the figure, reference numeral 20 denotes a CPU that performs various arithmetic operations including later-described arithmetic operations, and acts as a first arithmetic unit and a second arithmetic unit. Two
Reference numeral 1 is a ROM storing operation programs and the like, and 22 is a RAM storing various data. The CPU 20
An operation panel 24 for inputting various commands, a pattern input device 25, a needle position detection device 23 (see FIG. 1) for detecting the vertical position of the sewing needle, and the like are connected to the input side of the. Of these, the pattern input device 25 is composed of, for example, a digitizer, and can input the pattern data of the pattern to be formed from here. Note that this pattern data includes needle drop positions (X1, Y1), (X2, Y2), (X3, Y3) ... of patterns drawn on XY coordinates set on the rotatable turntable 5.
The data represents (Xn-1, Yn-2), (Xn, Yn), not the data set with reference to a spatially fixed member such as a sewing machine bed.

A sewing machine motor MM is connected to the output side of the CPU 20 via a sewing machine motor drive circuit MMD, and a rotation motor 7, an X motor 13 and a Y motor are provided via motor drive circuits 7a, 13a and 16b. The motors 16 are respectively connected, and the CPU 20 also functions as sewing machine motor control means, XY motor control means, and rotation motor control means.

As described above, in this embodiment, the XY moving mechanism can be rotated about the ascending / descending path of the sewing needle N by driving the rotating motor 7 and rotating the rotating table 5. By doing this, the work W attached to the XY moving mechanism can be rotated about the ascending / descending path L of the sewing needle in addition to the parallel movement in both X and Y directions by the movement of the moving tables 10 and 11 of the XY moving mechanism. You can do it.

Next, the pattern forming operation of this embodiment having the above construction will be described. When the power is turned on, the CPU 20
First, the rotating motor 7 is driven to set the rotating base 5 to the initial position, and the X motor 13 and the Y motor 16 are driven to set the moving bases 10 and 11 of the XY moving mechanism to the initial position. To do. The needle drop position (X1, Y1) of the first stitch set on the turntable 5 by this initial position setting operation is located in the sewing needle lifting path.

Next, when the data for N stitches representing the needle drop positions after the second stitch as described above is inputted by the pattern input device 25 to form a predetermined pattern, the CPU 20 next based on this data. The above calculation is performed to calculate the movement pitches of the X movable table 10 and the Y movable table 11 and the rotation angle θ of the rotary table 5. Note that the calculation operation regarding the first stitch is not performed because the needle drop position of the first stitch has already been set to the needle drop position by the previous initial position setting operation.

Now, the moving pitch of the X moving table 10 at the nth stitch is XP [n], and the moving pitch of the Y moving table is YP.
[N], if the turning angle of the turntable 5 is θ [n] in the counterclockwise direction with the X axis as 0 degree, they are XP [n] = X [n] −X [n−1] YP [N] = Y [n] −Y [n−1] θ [n] = Arctan (YP [n] / XP [n]) − Arctan (YP [n−1] / XP [n−1]) Desired. However, in the case of XP [n] <0,
If θ [n] is added 180 degrees and XP [n] = 0, Y
It takes a value of 90 degrees or −90 degrees depending on whether P [n] is positive or negative.

The data thus calculated is converted into drive data for the respective motors 7, 13, 16 (if the respective motors 7, 13, 16 are stepping motors, converted into the number of steps thereof). After being processed), it is stored in the RAM 22. Note that FIG. 5 shows a list of the data calculated for each number of stitches.

When a sewing operation start command is input from the operation panel 21, the CPU 20 drives the sewing machine motor MM to start the sewing operation. And
During this sewing operation period, the CPU 20 determines whether or not the sewing needle N is pulled out from the work W based on the signal from the needle position detection means, and every time the sewing needle N is pulled out from the work W, the above-described rotation angle θ [ n], movement pitches XP [n], YP [n] are read out, and the turning motors 7 and X are appropriately set according to the data.
The motor 13 and the Y motor 16 are driven.

Therefore, for example, the pattern input to the pattern input device 25 is a pattern as shown in FIG. 4, and the needle drop position data of the first stitch is (30, 15), and the needle drop position of the second stitch. When the data is (34, 17) and the needle drop position data of the third stitch is (37, 20), the data read from the CPU at the second stitch is XP [2] = 34-30 = 4 YP [ 2] = 17−15 = 2 θ [2] = Arctan (2/4) = 27 [degrees], and at the third stitch, XP [3] = 37−34 = 3 YP [3] = 20−17 = 3 θ [3] = Arctan (3/3) −Arctan (2
/ 4) = 45−27 = 18 [degrees].

As a result, at the second stitch, the rotation motor 7 is driven to calculate the rotation base 5, and the rotation angle θ [2] (=
27 degrees), and then the X movement table 13 is driven by XP by driving the X movement motor 13 and the Y movement motor 16.
[2] (= 4), Y move table is moved by YP [2] (= 2). The movement state of the work W at this time is shown in FIG.

As shown in the drawing, the work W in the initial position (shown in FIG. 3A) is shown in FIG. 2B around the needle drop position of the first needle located in the sewing needle elevating path. As shown, it rotates by θ [2] (= 27 degrees). As a result, the direction from the planned needle drop position (34, 17) of the second needle to the needle drop position (30, 15) of the first needle located on the ascending / descending path L of the sewing needle is forwardly fed on the sewing machine bed M2. Matches the direction (direction A). Therefore, the work W is XY after that.
The needle drop scheduled position (34, 1
7) moves to a position where the ascending / descending path L of the sewing needle matches (see FIG. 7C), but the moving direction is the forward feed direction (direction A) matched by the previous rotation operation. The connection between the upper thread and the lower thread at the second stitch is as shown in FIG.
It becomes appropriate as shown in (a).

At the third stitch, the work W has the needle drop position (34, 34) of the second stitch located in the sewing needle elevating path L.
17 [) from the position shown in FIG.
(= 18 degrees) rotate to the expected needle drop position (3
The direction from (7, 20) to the needle drop position (34, 17) coincides with the forward feed direction (see (d) of the same figure). For this reason, the conveyance to the position shown in FIG. 7E performed by the XY movement mechanism thereafter is forward feed, and proper connection can be obtained even at the third stitch.

Similarly, in the stitch forming operation for the fourth and subsequent stitches, the sewing operation is performed while the work W is always moved forward. Therefore, all the seams from the start of sewing to the end of sewing are proper seams where the seam ends are continuous as shown in FIG. 9A, and high quality patterns are formed.

In the above embodiment, the moving pitch data XP [n], YP calculated in advance before the start of the sewing operation are used.
[N] and the rotation angle θ [n] are stored in the RAM 22 and read out for each needle to control the motors 7, 13 and 16, but the sequential calculation operation is performed for each needle. It is also possible to control each motor 7, 6, 13.

Further, in the above description, one embodiment in which the present invention is applied to the post type sewing machine is shown, but the present invention can be applied to other than the post type sewing machine and is particularly limited to the above embodiment. Not a thing.

[0032]

As described above, in the work transfer device for the pattern sewing machine according to the present invention, the XY movement mechanism for moving the work in parallel in both the X and Y directions is rotated around the ascending / descending path L of the sewing needle. It is supported by a rotating turntable, and the rotation of the turntable causes the work transfer direction by the XY moving mechanism to always be the forward feed direction parallel to the moment of the sewing machine hook at the position facing the needle thread insertion hole of the sewing needle. Since the patterns are made to coincide with each other, it is possible to form all the seams from the start of sewing to the end of sewing of the pattern having any shape by proper joining. For this reason, the front and rear ends of the adjacent seam are formed in a continuous state with each other, so that a pattern with excellent appearance can be formed, and thread breakage does not occur due to the sewing direction as in the past, and productivity is greatly improved. Can be expected to improve.

[Brief description of drawings]

FIG. 1 is a front view showing an embodiment according to the present invention.

FIG. 2 is a perspective view showing a main part of the one shown in FIG.

FIG. 3 is a block diagram showing a configuration of a control system circuit according to the embodiment.

FIG. 4 is an explanatory plan view showing an example of a pattern formed by the embodiment.

FIG. 5 is a diagram showing a moving pitch of an X moving table, a moving pitch of a Y moving table, and a turning angle of a turning table calculated for each number of stitches by a CPU.

6 is an explanatory plan view showing a movement state of the work at the time of the sewing operation from the first stitch to the third stitch of the pattern shown in FIG. 4, (a) shows the position of the work at the first stitch, b)
Is the rotation state of the work after the completion of the first stitch, and (c) is the first
The movement state of the work by the XY movement mechanism after the stitch is finished,
(D) shows the rotation state of the work after the second stitch is finished, (e)
Shows the movement state of the work by the XY movement mechanism after the end of the second stitch.

FIG. 7 is an explanatory plan view showing a forward feed direction of a work.

8A and 8B are explanatory vertical cross-sectional side views showing a binding state of an upper thread and a bobbin thread, wherein FIG. 8A shows a proper binding state and FIG.

9 is an explanatory plan view showing a seam, (a) of FIG.
6A shows a proper seam formed in the connected state shown in FIG. 6A, and FIG. 6B shows a hitch stitch formed in the connected state shown in FIG. 6B.

[Explanation of symbols]

5 rotation base 7 rotation motor 10 X movement base 11 Y movement base 13 X motor 16 Y motor 20 CPU (first calculation unit, second calculation unit, XY motor control means, rotation motor control means) W work Na upper thread insertion hole N sewing needle Na upper thread insertion hole L rotary hook

Claims (3)

[Claims] 1. A rotating base rotatably supported around a lifting path of a sewing needle, and a workpiece which is to be sewn and which moves along X and Y directions set on the rotating base. At the same time, an XY moving mechanism that rotates integrally with the turntable, an X motor as a drive source that moves the XY moving mechanism in the X direction, and a Y motor as a drive source that moves the XY moving mechanism in the Y direction. And a rotation motor that rotates the rotation base, and X that is sequentially read for each stitch corresponding to the pattern to be formed.
XY motor control means for intermittently driving the X motor and Y motor based on the needle drop data in the Y direction and the needle drop data in the Y direction, and the rotary hook at the position opposite to the needle thread insertion hole formed in the sewing needle. A work transfer device for a pattern stitch sewing machine, comprising: a rotation motor control means for driving the rotation motor so that a forward feed direction parallel to a moment and a stitch forming direction coincide with each other. 2. A rotation motor driving means calculates the angle formed by the stitch forming direction and the forward feed direction, and the rotation motor drive means rotates the rotation base by the angle calculated by the calculation means. 2. A work transfer device for a pattern sewing machine according to claim 1, further comprising a control unit for driving a motor. 3. The operation unit, based on the needle drop position data X [n] in the X direction and the needle drop position data Y [n] in the Y direction, the movement pitch XP in the X direction.
[N] and the first calculation unit that calculates the movement pitch YP [n] in the Y direction, and the angle θ based on both movement pitches XP [n] and YP [n].
And a second arithmetic unit for calculating, where the first arithmetic unit is: XP [n] = X [n] −X [n−1] YP [n] = Y [n] −Y [n−1 ], And the second operation unit calculates θ [n] = Arctan {(XP [n]) / (YP [n])}-Arctan {(XP [n-1]) / (YP [n -1])} (n represents the number of stitches) is calculated, The work transfer device of the pattern sewing machine according to claim 2 characterized by things.