JPS58192580A - Apparatus for detecting needle position of 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 The present invention relates to a needle position detection device provided in a zigzag stitch sewing machine in order to stop the sewing machine at a predetermined position of the needle.

Conventionally, in order to stop the sewing machine at a predetermined position of the needle, the sewing machine that is rotating at high speed is first decelerated to low speed, and the cycle of this low-speed drive and the rotation of the sewing machine are maintained in synchronization, and the stop position is detected. A device that moves the needle and stops it at a fixed position has already been used, but this device was able to stop the needle regardless of its left or right position.

In a zigzag stitch sewing machine, stopping the sewing machine at a predetermined lateral position of the needle is required, for example, in the following cases. In other words, in order to change the sewing direction with the needle stuck in, it is necessary to change the orientation of the workpiece (corners may not be sewn at an arbitrary position).
, when sewing workpieces together (if the workpieces are not placed in a certain position, the finished product will vary), when cutting the thread at the end of a U-made product, or when sewing workpieces without stacking them (
(The needle must be held in the lower stop position immediately after the lower stop position.)

Conventionally, a device for stopping a zigzag sewing machine at a predetermined needle position has been proposed in Japanese Patent Publication No. 46-10142. That is, a device for generating a zigzag motion (
The lateral position of the needle (left or right side) is controlled by a control switch controlled by a permanent magnet mounted on the swing rod or by a synchronizer with 4 rotations relative to the upper shaft.
The sewing machine stops at the low needle position depending on the

However, with this conventional device, only two stopping positions, one to the left of the center and one to the right from the center, can be obtained, so it can be used for ordinary zigzag stitches and straight stitches, but it can be used for 3-point zigzag,
With four-point zigzag stitching, it is difficult to always stop the sewing machine at a predetermined position. In this case, it is possible to do this by using a control switch, but the adjustment must be made every time the swing +11 changes, and the mechanism is complicated because there are many wirings and components.

The present invention attempts to solve the above-mentioned conventional drawbacks by replacing the position detection plate with a position detection plate compatible with various types of zigzag stitches, and automatically synchronizes the position of low-speed drive periodic position detection using the clutch and brake. In order to match the stopping position and the timing of the brake in order to make the stopping position accurate, a speed generator that detects the speed, one macnet, two magnetic sensing elements, and a magnetic sensing element that blocks the magnetic field are used. In a needle position detection device equipped with two position detection plates that operate elements, the position detection plates are rotated via a reduction gear in order to obtain a predetermined lower stop and lower stop position according to the number of stitches of zigzag stitches. An object of the present invention is to provide a needle position detection device for a sewing machine capable of detecting and stopping a predetermined position in various types of zigzag stitches by having a configuration in which the position detection plate according to the type of zigzag stitches can be easily replaced. It is.

Position inspection for regular zigzag and straight stitch sewing machines;
It is sufficient to use a publication, and it is easy to exchange it. Furthermore, since there are fewer component parts, the device is compact and lightweight, making it easy to handle. At the same time, it has the same stopping accuracy as conventional detection devices, and can be easily installed on conventional sewing machines. It is something to play.

Embodiments of the present invention will be explained below with reference to the drawings. Figs.
An example will be shown in which when sewing a workpiece (1), for example a pocket, with a four-point zigzag sewing ring for decorative stitching, the needle is placed near the bottom dead center of the pocket at the corner of the pocket, the so-called predetermined stopping position (2). If you stop the sewing machine at the lower stop position (Fig. 1 ()), even if you change the direction of the pocket with the needle in place (Fig.
Figure (b)), you can always start sewing from the corner. However, if the needle stops at the lower stop position at any intermediate sewing position, the corner will remain unstitched. According to the present invention, even if the sewing machine is stopped halfway, it always stops at the end of the pocket as shown in (2) in FIG. 1 (n), making it easy to check the seam allowance and control the sewing direction.

FIG. 2 is a front view showing the operating state of the apparatus according to the embodiment of the present invention, in which a fixed position stop motor (1
) is attached, and the motor (4) has the function of stopping the needle (n) in a fixed position, and its rotation is caused by stepping on the foot pedal (5) attached below the table leg θ. and the motor control device (7) via the connecting rod (6).
This causes the sewing machine (11) to rotate at high speed.

Next, when the foot pedal (5) is returned to the neutral position, the needle position detection device (1) attached to the upper shaft (121) of the sewing machine
, 4) to detect the bottom stop position near the bottom dead center of the needle (n),
The sewing machine (II) is stopped at the lower stop position by the fixed position stop motor (4) via the motor control device.

When the foot pedal (5) is further depressed in the opposite direction, the needle position detection device αa moves the sewing machine 0υ to the lower stop position of the needle (n) near the top dead center of the balance (it rotates 180 degrees and stops).
. In Fig. 2, (8) is the motor main shaft, (9) is the motor pulley, QOI is the belt, (+31 is the flywheel,
(15) indicates a lead wire, and αe indicates a needle bar.

Next, FIG. 8 is a vertical sectional view showing details of the needle position detection device 0 in FIG. 2, and FIG. 4 is an exploded perspective view of the device in FIG. 3. (+7) is attached to the upper shaft (+21) of the sewing machine by a rotor fixing screw (18) (the timing of the stop position is adjusted by this screw 08), and rotates together with the sewing machine (01). Further, the I] - θ motor is rotatably held in the detection device body 09 by a ball bearing.

23+ is a speed generator, which is fixed to the rotor 0η and converts the two rotations into voltage to drive the motor (
4), which controls the driving speed, is a conventionally known method. (28) is the rotor shaft, (
''-07) to perform the same rotation.

This coater shaft (28)
The ball bearing holder is attached to the detection device body 09 using the drive gear (28) formed in the switch bracket C3 (+1a) using the screw 01.
1) is rotatably held by a gear bearing 04 that is press-fitted into the gear bearing 04.

In addition, a resin reduction gear A (3 moats,
The rotation of the sewing machine 0υ is transmitted to the reduction gear B (35 +
Furthermore, a thrust stop washer (3) is attached to the rotor shaft (28).
4) The rotation of the detection plate drive gear hemi-shin (11) is transmitted at a speed reduced to 4 relative to the rotation of the detection plate drive gear hemi (11), which is loosely held by the retaining ring Gω.

The fence is a detection plate drive gear, and the collar (G) is sandwiched between the detection plate fixing screws (37), and two single blade type detection plates (for the lower stop (89a) and for the lower stop (39b)) are installed. ) is fixed
I have V. In addition, with respect to the blade for lower stop (39a), the blade for lower stop (891)) is protrusion A-1 protrusion B C3
8), the rotation angle is fixed at a position delayed by 30 degrees.

In addition, a magnetically sensitive element A (4
2a), B (421)) are arranged in the axial direction on both sides of the position detection mcnet (1:I), and the elements (421))
2a) When the blade of the detection plate rotates and reaches between (42b) and the magnet (43), the magnetism is cut off and the sewing machine is stopped.

Therefore, in the case of a 4-point zigzag sewing ring (Fig. 5 (1')), the number of stitches in the left and right direction is 6 in one cycle, so if you set the right needle to the lower stop position first, you will definitely be able to Located at the needle down stop position. Same as 1, top stop position b-toゎyo 1゜□oh6ofjoh. One.ゎ (Yowat town ya, (2
z is the thrust washer, (2a is the speed generator mounting screw,
CI'6) is the lead wire for the speed generator, C30) is the switch bracket), (4 (l is the insulator mounting screw, (41 is the insulator, (1st is the printed wiring board, (45) is the position detection (4 (D is a cover, G7) is a thrust washer, and 07 is a connector.

In addition, the lower side stopping position of the needle (n) can be set to any position in the 4-point zigzag stitch using the rotor fixing screw 08), and there is no need to readjust it even if the zigzag stitch is changed. I can handle it. Further, the lower stop position also stops immediately after that in accordance with the above.

1 In the above embodiment, the rotation of the detection plate is decelerated to 4 to 1 to perform 4-point zigzag stitches, but it is also possible to decelerate the rotation of the detection plate to 1/1 to perform 3-point zigzag stitches. .

Next, FIG. 5(a) shows a single blade type position detection plate C31, (b) shows an eight blade type position detection plate (49), and (c) shows a six blade type position detection plate (50). Figure 5 (a) shows a four-point zigzag sewing ring, (I) shows a regular zigzag stitch), e) shows a straight zigzag stitch), and Figure 6 (a) shows a 4-point zigzag stitch. The same single-blade type position detection plate (3 gulls are shown, but Fig. 6 (a)
Figure 6 (b) shows a two-blade type position detection plate 6υ, (c) shows a four-blade type position detection plate Ordinary zigzag stitch (wealth), (/→
indicates straight zigzag stitch).

[Brief explanation of drawings]

Fig. 1 (A) (The snout is an explanatory diagram showing a state in which a pocket is sewn by the device of the present invention, Fig. 2 is a front view showing a state in which the device according to an embodiment of the present invention is used, and Fig. 8 is a Figure 4 is an exploded perspective view of the needle position detection device, Figures 5 (A), (D), (C) and Figure 6 (A) (q (C) are various vane type They are a front view and an explanatory diagram showing the position detection plate. Description of main parts of the figure n... Needle 1... Workpiece 4... Fixed position stop motor 7... Motor control device 11... Sewing machine llJ...
- Needle position detection device 23...Speed generator 25...Speed generator magnet 88...Reduction gear A 83...Reduction gear B8
6...Detection plate drive gear 89...Single blade type position detection plate 42a...Magnetic sensing element A 42b...Magnetic sensing element B 43...Macnet for position detection 5: Two... 4-point zigzag stitch 54... Ordinary zigzag stitch 55... Straight zigzag stitch 56... 3-point zigzag stitch Patent Applicant Aisin Seiki Stock and Agent Patent attorney Takashi Karagi 1FEJ Figure 5-497- 2 Procedural Amendment June 10, 1980 Haruki Shimata, Commissioner of the Patent Office 1 Display of the Case 1982 Patent Application No. 76364 2 Invention 0 Title Sewing Machine Needle Position Detection Device 3, Person Making Amendment Case Relationship between Patent applicant 4, Agent 6, Number of inventions increased by amendment 7, Contents of the amendment subject to amendment■, "Next, what is shown in Figure 5(f)" on page 9, line 13 of the specification
is corrected as follows. ``Next, Figure 5 shows examples of various position detection plates and various stitches corresponding to the detection plates when the rotation of the detection plate is decelerated to %. 8. Correct “straight zigzag stitch” in line 1 and page 10, line 1 to “straight stitch”. 8. Correct “Fig. ``Figure 6 shows examples of various position detection plates when the rotation of the detection plate is decelerated to 4, and various stitches corresponding to the detection plates.
(b) is.''That's all i. Procedural amendment (method) % formula % 1. Indication of the case 1982 Patent No. 1 No. 76864 3. Person making the amendment Relationship with the case Patent applicant 4. Column for agent explanation, Drawing 8 Attached sheet of contents of amendment As stated, the contents of the amendment ■, page 8, line 13 of the specification, 1 (Fig. 15, p)'' have been changed to
(Figure 5 (AA)) Correct as J. 2. On page 9, lines 13 and 17 (2 places)
Correct “(4)” to “(4)”. 3. Change “(b)” in lines 13 and 19 of page 9 to r.
(B) Correct as J. 4. Change "(c)" in lines 14 and 19 of page 9 to "
Corrected to January. 5, page 9, lines 15 and 18, replace [ge)J with r(
AA) Correct as J. 6, page 9, lines 16 and 20, “(b) J [
Correct as (BB)J. 7, page 9, line 16, and page 10, line 1, “(c)
” is corrected as r(CC)J. 8. Correct "r(()f口)(c)" in the 7th and 8th lines of page 1O to r(A)(B)(C)J. 9, page 10, line 9 (2 places) NorrK) (1:9(
Correct "c)" to r (AA) (BB) (CC)J. 10. Figure numbers “(A)” and “(0) in Figures 5 and 6 of the drawings
month ``(ha)'') - 1 ``What month ``(cI month ``(ha)'')
5)” [(B month r (C month r (AA) J r (BB
) J r (CC) Amend it as J (please correct it by the inspector). that's all

Claims (1)

[Claims] The fixed position stop motor, which has the function of stopping the needle of the sewing machine at a fixed position, detects rotational fluctuations of the sewing machine and controls the fixed position stop motor using an output voltage so that the sewing machine is driven at a predetermined low speed. A speed generator that provides feedback through the device, one position detection magnet that indicates the stop position of the sewing machine, two magnetic sensing elements, and a position detection plate that rotates together with the sewing machine and blocks the two magnetisms. In a needle position detection device for a sewing machine equipped with a two-position detection function arranged in a direction, a reduction gear is used to reduce the rotation of the position detection plate with respect to the rotation of the sewing machine, and the needle position detection device is compatible with various types of zigzag stitches and straight stitches. 1. A needle position detecting device for a sewing machine, characterized in that by replacing the position detecting plate, a lower stop position of the sewing machine needle can be selected and stopped at any of the needle piercing positions forming the stitch.