JPS59137091A - Automatic pattern stitch sewing machine - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

Detailed Description of the Invention This invention is an automatic pattern sewing machine that places a futon or side fabric of a futon on a movable table and moves it against the sewing machine body along a sewing pattern to sew it. Regarding sewing machines.

Conventionally, this type of sewing machine will be explained with reference to FIG. 1, as shown in FIG.
A sewing machine base 5 (this 2
Place the object to be sewn A = A movable table 6 is provided so as to be movable in the horizontal direction, and a drive device moves this movable table 6 to the sewing machine head 1 and the sewing machine lid 3 (to which the sewing pattern is moved). Then, the object to be sutured A is sutured.

Incidentally, in conventional sewing machines, the sewing machine head 1 and the sewing machine lid 3 are generally fixed to a frame so as not to rotate, and the feeding direction (needle movement direction) of the sewing machine is kept constant. Therefore, when sewing a curved pattern by making a two-dimensional compound movement of the movable table 6, the direction of movement of the object to be sewn (sewing direction) will constantly change from front to back, left to right, diagonally, but the direction of needle movement will be constant. As a result, the suturing direction and the direction of needle movement are different, the tension of the suture thread changes, and the actual situation is that uniform and beautiful stitching cannot be performed.

Especially for double needle sewing machines and zigzag sewing machines.

As shown in Fig. 12, parallel stitching patterns (a) and zigzag patterns (b) cannot be obtained unless the stitching direction and needle movement direction match, and as shown in Fig. 13, the sewing direction It is necessary to sew the desired pattern by matching the direction of needle movement. In the figure, the arrow a indicates the needle movement direction, the arrow b indicates the suturing direction, and B is a general term for the sewing machine head/lid part 1.3, and below P1, the eye is generically referred to as sewing machine B.

Therefore, as shown in Japanese Patent Publication No. 47-17571, the sewing machine head 1 and the sewing machine cover 3 are made rotatable, and the sewing machine head 1 is made rotatable to correspond to the movement of the movable table 6.
A sewing machine has also been devised in which the lid portion 3 is rotated so that the direction of needle movement coincides with the sewing direction. However, the conventional means for rotating the sewing machine head 1 and the lid 3 in response to the movement of the movable base 6 is a mechanical mechanism 1 such as a chain or a transmission shaft, as described in the above-mentioned publication. Therefore, the synchronization between the sewing machine head 1 and the lid part 3 is also caused by a weaving-like mechanism.For this reason, the mechanism is extremely complicated, and the number of parts is large, as well as the processing accuracy and assembly accuracy. If the accuracy is low, backlash will occur and the angular accuracy will become inaccurate.

The present invention takes the above points into consideration and solves the above problems by simplifying each mechanism to electrically synchronize the driving of the sewing machine head, the driving of the sewing machine lid, and the rotation of both. The purpose is to solve the problem.

That is, in the above-mentioned conventional automatic pattern stitch sewing machine, the upper frame (this is provided with a rotation axis in the vertical direction, the sewing machine head and its drive motor are attached to the lower end of this rotation axis, and the upper frame (this is provided with a rotation axis that rotates the rotation axis). At the same time, the lower frame is also provided with a rotating shaft in the vertical direction. Attach the motors, electrically synchronize both drive motors and both rotation motors, and make the two rotation motors correspond to the drive device of the movable base so that the moving direction of the movable base coincides with the moving direction. It is designed to be operated by

With this configuration as described above, the driving and turning of the sewing machine head and the driving and turning of the sewing machine lid can be made to correspond accurately and easily.

The synchronization mechanism is also simple because it is electrical. Therefore, when sewing a large item such as a futon, the sewing machine needs to have a long bosom, and if it is a mechanical one-stroke as in the past, the transmission member will also have to sew for a long time, resulting in a load on the motor. However, in this invention, the sewing machine head and lid part move independently, and there is no mechanical transmission member between them, so the foot roller is made deeper. However, the load on the motor does not increase, and smooth operation is performed.

Embodiments of the present invention will be described below with reference to the accompanying drawings.

As shown in FIGS. 1 and 2, the sewing machine base 5 consists of two stand frames and an upper and lower frame 2.4 installed between the stand frames. Upper frame 2
Sewing machine head 1. Sewing machine lids 3 are attached to the lower frame 4 so as to face each other, and suturing is performed by interposing the object to be sutured between the two.

At the bottom of the sewing machine base 5, two base rails 6' are provided in the front-rear direction (Y-axis direction), and on these rails 6', a square frame-shaped cart 8 is movable back and forth via wheels 7. It is set in. A forward and backward feed screw 9 is provided on one side of the rail 6'.
moves one step forward or backward.

The sides of the cart 8 in the left-right direction (X-axis direction) are rails, and a rectangular frame-shaped movable stand 6 is provided on the rails via wheels 11 so as to be movable left and right. Left and right feed screws 12 are installed on the left and right sides of the trolley 8, and these screws 12 are threaded through the movable base 6, and the rotation of the screws 12 by a servo motor 13 causes the movable base 6 to move relative to the trolley 8. Therefore, the movable table 6 on which the object to be sutured A is placed can be moved to any position on the horizontal plane (on the XY coordinates) by the motors 10 and 13 +, and this movement trajectory can be set appropriately. (Various stitching patterns can be obtained from this.

A rotating shaft for vertical rotation is provided in the center of the lower frame 4 via a bearing 14, and the sewing machine lid 3 and a pulse motor 16 for driving the sewing machine lid 3 are attached to the upper end of this shaft 15. The lower end of the rotating shaft 15 is connected to a swing motor 171 fixed to the lower frame 4, and the drive 1 of this motor 17
This allows the sewing machine lid part 3 to face in any direction in accordance with the feeding direction.

A pipe-shaped rotary shaft 19 is also provided in the center of the upper frame 2, as shown in FIG. A pulse motor 20 for driving the same is attached.The sewing machine head 1 of the embodiment is a zigzag stitch sewing machine, and in the figure, 20' is a sewing machine needle, 21 is a presser foot, 22 is a needle rocking table,
23 is a camshaft worm wheel, and 24 is a worm for the swing cam.

A collar 25 is fitted into the upper part of the rotating shaft 19, and a groove 26 is formed in the opening direction at the upper end of the collar 25, and the body portion is a gear 27. Groove 26 (as shown in FIG. 4,
A rotatable cam follower 28' at the tip of the U-shaped locking portion of the crank 28 is fitted, and the crank 28 is swung by the cylinder 29, and the swing of the crank 28 causes the rotating shaft 19 to move up and down. This amount of movement may be set appropriately, and the bottom dead center is determined by the contact position of the collar 25 with the bearing 18. It is also possible to provide a rack in the same direction, and rotate a pinion meshed with one of the racks by one motor, and move the rotating shaft 19 up and down by this gear mechanism.

The gear 27 of the collar 25 is connected to a servo motor, and the fixed gear 30 is in mesh with each other to drive the motor 30 (which allows the sewing machine head 1 to face in any direction).

A disc-shaped current-carrying plate 31 is fixed to one upper end of the rotating shaft 19.
An arbitrary number of current-carrying parts 32 are formed concentrically on this plate 31, and a control lead wire 33 of the sewing machine head 1 passing through the rotating shaft 19 is connected to the lower surface of the current-carrying parts 32. Electrical plate 3
A current-carrying material 35 such as a carbon brush to which a lead wire 34 from a sewing machine controller (to be described later) is connected is in contact with the top surface of 1, and due to the contact between this current-carrying material 35 and the current-carrying part 32, both lead wires 3
3.34 is connected.

The motor 20 for driving the sewing machine head 1 and the motor 16 for driving the sewing machine hook 3 are designed to operate in synchronization, and both rotation motors 17 and 30 operate in synchronization with each other in response to the movement of the movable base 6. It is activated so that the sewing machine's feed direction matches the tangential direction of the sewing pattern.

Further, the motors 10 and 13 are operated based on numerical control (based on which the moving plane of the movable base 6 is set as the XY coordinates).

The motors 17 and 30 are also automated so that they are operated by a control method that digitizes the rotation angle.

Therefore, when sewing a futon or the like, the object to be sewn A is placed on the movable base 6, and the movable base 6 is given a set movement by controlling the motors 16 and 20 to follow the sewing pattern. Move object A to be sutured.

On the other hand, the motors 17 and 30 are also operated in accordance with the amount of movement of the movable base 6, so that the sewing direction of the sewing pattern (the feeding direction (needle movement direction) of the sewing machine is matched) and the sewing is performed smoothly.The movable base 6 ( When placing the object to be stitched and setting it between the sewing machine head 1 and the lid 3, if the object to be stitched A is so thick that it is difficult to set it in the space between the sewing machine head 1 and the lid 3, the sewing machine head can be moved from the cylinder 291. All you have to do is increase 1.

The circuit to the sewing machine controller is configured as shown below, for example.

That is, as shown in FIG. 5, the motor control section 36,
Machine control section 37. It consists of an operating section 38 and its display section 39, and an external storage device 43, into which each operation of the sewing machine is programmed or input via an interface 40, a data bus 41, and a control bus 42.
A random access memory 44, a read-only memory 45, and a central processing unit 46 are connected, and by operating the operating section 38, desired commands are manually input to the one-car control sections 36 and 37.

The machine control section 37 also manually inputs a signal from a mechanical device switch 47, and operates drive #4 of mechanical devices such as the lifting cylinder 29 of the sewing machine head 1 based on signals from this switch 47 and the memory 44, 45, etc. let

Motor control section 361 and digital/analog converter 49
The servo motor 10.13 for moving the movable base 6 is connected via the driver circuit 50. .16 is connected, and furthermore, in order to match the needle movement direction with the moving direction of the movable table 6, that is, the suturing direction, the signal from the converter 49 is transmitted to the discrimination circuit 53.
This discrimination circuit 53 (this driver circuit 5
The above-mentioned servo motors 30 and 17 for rotating the sewing machine head and lid are connected through valves 4 and 4.

Therefore, as shown in FIG. 6(a), if the sewing machine signal is being output from the motor control section 36, for example, the pulse circuit 51 shown in FIG. , the driver circuit 52 outputs an output in synchronization with the pulse oscillator, as shown in FIG. 2(a), and the sewing machine head/cover driving servo motor 20.16 rotates synchronously without a deviation of one pulse to perform stitching.

Also, based on the sewing pattern program, the
Signals ■A, ■7 corresponding to coordinate 1 are motor control unit 3
6 to the digital/analog converter 49° and the servo motor 13.10 for moving the movable table 6 via the driver circuit 50.
The motors 13 and 10 are operated to move the movable base 6 at the desired speed to the desired suturing position, and the sewing machine head and
Stitching is performed by driving the lid portions 1 and 3 once.

The movement of the movable table 6 (corresponding to the change in the suturing direction, the head/cover part 1.3 of the single sewing machine rotates so that the direction of needle movement coincides with the change in the suturing direction). The circuit 53 includes, for example, an angle-to-voltage converter 55, a sample-and-hold circuit 56, a pulse generator 57, a voltage-to-frequency converter 58, a deviation counter 59, a digital/analog converter 60, and a direction as shown in FIG. The position signals x and Y are input to the angle-voltage converter 55, where the angle θ in the suturing direction is converted to a potential, and this potential is sent to the sample and hold circuit 561. Therefore, it is sampled with synchronization based on the pulse generator 57, and the potential of V at a certain time 1n is compared with the potential of V at the previous sampling time 'n-1, and the potential of this potential difference is determined. Vs-1 is output to the voltage same wave number conversion circuit 58. This potential vs is the deviation angle in the suturing direction, and it is only necessary to rotate the sewing machine head/cover parts 1 and 3 by this angle, and the conversion circuit 58 The potential v5 is converted into a frequency and inputted to the deviation counter 59, and the digital/analog converter 60.driver circuit 5
4, the servo motors 30, 17 rotate through their deflection angles. The turning amount and forward/reverse rotation of the motors 30 and 17 are determined from the passing direction by the number of slits in the encoder 62 and the determination circuit 61, and the signal is sent to the deflection counter 59.
As a result, the sewing machine head/cover portions 1 and 3 are rotated in a desired direction, that is, in a needle movement direction that coincides with the sewing direction. It goes without saying that the conversion from the potential (2)8 to the same wave number is performed by applying one wave number such that the same wave number corresponds to the number of slits of the encoder 62 corresponding to the deviation angle at the potential V51.

Roughly detailing the angle-voltage converter 55, for example, as shown in FIG. 8, it includes an absolute value amplifier 63, a polarity detector 6
4. ■x zero detector 65. ■Y/vx comparison circuit 66, θ-2π detector 57, which will be described later. AND circuit 6B, oR circuit 6
9, consisting of an amplifier 72 and a voltage adder 70.71,
The operation will be explained with reference to the case of stitching the stitching pattern d shown in FIG. 9.

First, as shown in FIG. 10, the angle (stitching angle) θ facing counterclockwise from the Y-axis direction of sewing machine B is set to 30〈θ1≦-9-, θ2≦π, π〈θ3≦-π, 100 pi2
2 2〈θ4≦
2π, and the voltages corresponding to a rotation of 90 degrees ('fi) are ■o, θl, θ2. θ3. X within θ4
If the angle between the axis and the Y axis is θ', then θ=Σ×m(m:o
, 1.23)+θ'. therefore.

Absolute value amplifier 63 (this position signal vx,
When the voltage V' corresponding to the angle θ' between VX and the X-axis or Y-axis is output, VX and V are connected to the polarity detector 64 (
The polarity is determined by C, and the determined signal is used for each AND
The circuit 6B manually determines in which rotational angle range (one of θl, θ2.θ3.θ4) ■A, ■7 is located, and the voltage corresponding to that angle (0, V
o, 2Vo, 3Vo) are input to the adder 70. On the other hand, based on the determination of the angular position, one of the comparison circuits 66 is turned on by the OR circuit 69) via the switch 73, and the voltage V' is added to the voltage V' from the adder 70 by the adder 71. The rotation angle of the position (rotated angle from the mouth) θ is output as a voltage ■. When the voltage reaches the position ①, the reset signal R5T is output, and the voltage becomes 0 potential.

Fig. 10) Sewing order of pattern A: A1, C.

A timing chart of the angle-to-voltage converter 50 is shown in FIG. 11, where v, , v2. v3. v4 is each θl, θ2 . θ3. Indicates the angle versus cardiac potential ■ at θ4, v,=v', v2=vo+v', v,=2v
o+v', v4==3v.

+v'.

[Brief explanation of the drawing]

FIG. 1 is a schematic front view of an embodiment of the automatic pattern stitch sewing machine of the present invention, FIG. 2 is a plan view of FIG. 1, FIG. 3 is an enlarged sectional view of the main part of FIG. 1, and FIG. 3 is a cross-sectional view taken along line X-X in Figure 3, Figure 5 is a block diagram of the control circuit in Figure 1, Figure 6 (a) is a sewing machine timing chart, fbl is a pulse circuit diagram, and Figure 7 is a discrimination circuit. 53 is a detailed block diagram, FIG. 8 is an angle-voltage converter circuit diagram, FIG. 9 is a suture pattern diagram,
0 is a suturing explanatory diagram, FIG. 11 is a timing chart diagram of FIG. 8, and FIGS. 12 and 13 are suturing explanatory diagrams. 1... Sewing machine head, 2... Upper frame, 3...
Sewing machine lid, 4... Lower frame, 5... Sewing machine base, 6... +5' [l, 10.13... Pulse motor, 16.20... Servo motor, 17.30...・
Servo motor, A...Object to be sewn. Patent Applicant: Yama-Sewing Machine Industry Co., Ltd. Agent: Kama 1) Letter D Figure 12 (a) Figure 13 (a) (b) (b) 567-

Claims (1)

[Scope of Claims] A sewing machine base having an upper frame provided with a sewing machine head and a lower frame provided with a sewing machine lid is provided with a movable table movable in the horizontal direction on which an object to be sewn is placed, and a drive device In an automatic pattern sewing machine in which the object to be sewn is sewn by moving this movable table along with the sewing machine head and the sewing machine lid, the upper frame is provided with a vertical axis of rotation. Attach the sewing machine head to the lower end of the rotating shaft. Attach the drive motor one place near the head.)
A swing motor for rotating the rotating shaft is attached to the upper frame, and a vertical rotating shaft is also provided to the lower frame, and the sewing machine lid is attached to the upper end of this rotating shaft, and this drive motor is connected to the lid. When installed near the
A swing motor that rotates the rotating shaft of the lower frame 1 is attached, and the plane drive motor and both swing motors are electrically synchronized, and both swing motors are moved on a movable platform so that the sewing direction (needle movement direction) is the same. An automatic pattern stitch sewing machine characterized by being operated in accordance with the driving device.