JPH03170193A - Device for sewing outer periphery of air bag - Google Patents

Abstract

PURPOSE:To process parts pieces in various sizes with various diameters, to correctly and easily cut a thread after sewing and to improve the quality and efficiency of sewing by matching the position of the parts piece to a lower rotary plate by a reference position on a guide plate. CONSTITUTION:An upper rotary plate 8 rises up and an upside parts 12a is set onto a lower rotary plate 5. Next, a notch (a) of the upside part 12a is matched to a reference A of a guide plate 31, notch (b) is matched to a reference line B and a notch (c) is matched to a reference line C. Further, a downside part 12b is overlapped and notches a1, b1, c1 and c2 are respectively made coincident to the notches (a), (b) and (c) of the upside part. Thus, the respective central points of the lower rotary plate 15, upside part 12a and downside part 12b are made coincident and position matching is finished. Next, when the upper rotary plate 8 falls down and presses the respective parts pieces, a cylinder 28 is operated and a movable pedestal 1 is moved in a sewing position direction. Then, when a second abutting object 25 is abutted to the tip of a shock absorber 27 of a movable supporter 26 in a second stopper mechanism, the pedestal is stopped.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to an airbag outer periphery sewing device that is installed in the center of a steering wheel of an automobile and is installed in the center of a steering wheel of an automobile to sense vibrations caused by a collision and instantly inflate to protect the human body. It is related to. [Conventional Technology Figure 5 is a diagram showing a conventional device of this type. The movable table 1 is moved forward and backward with respect to the sewing device 2 by a cylinder (not shown) on a guide rail 3.
A lower rotary plate 5 rotated by a rotation drive source 4 is mounted on the movable base l, and a rotating part 6 is fixed to the movable base l, and can be slid up and down on this rotating part 6. , a rotatable rotating shaft 7 is provided. An upper rotary plate 8 for holding down is fixed to the lower end of the rotary shaft 7, and the center of this single rotary plate 8 coincides with the center of the lower rotary plate 5. Further, the upper end of the rotating shaft 7 is rotatably connected to one end of a drive shaft 9, and this drive shaft 9 is rotatably mounted on a fulcrum 10.
The other end of the drive vehicle 9 is connected to the piston shaft of the cylinder 1. Then, a circular part piece 12a. which depicts the air hug l2 shown in FIG. 12b is set on the lower rotary plate 5, and as shown in FIG.
ii) Align each circular part and the rotary plate 5 so that they are concentric with the outer circumferential guides 13, 13, which can be adjusted in diameter. Next, the drive shaft of the cylinder 11 is driven to lower the upper rotary plate 8 and fix the parts pieces 12a, 12b in predetermined positions.

Then, the movable table 1 is moved in two directions of a two-needle, double-ring sewing machine serving as a sewing device, and the two-needle, double-ring sewing machine is moved in two directions to sew the periphery of each part piece. When the stitching is finished, the upper thread of the second thread hanging from the needle of the second thread is cut, the part piece to be N is moved from the sewing position by the movement of the moving table 1, and the louver thread is pulled. , :55UA, the cylinder 2a provided in the head of the sewing machine 2 lowers the thread trimming heater 2b to cut the louver thread, and then the thread trimming heater 2b rises.

Then, the rotating section 6 rotates and the upper quarter plate 8 rises, and the combined airbag is removed and the next process begins. [Section B to Invent or Solve] However, the above-mentioned conventional technology has the following problems. (b) When the size of each part piece changes, it is necessary to accurately change the amount of movement of the moving table from the original position to the sewing position in response to this change. Unable to respond appropriately.

(0)! After the i-manufacturing is completed, the movable table is moved toward the original position to cut the louver thread, but the amount of movement is large and the amount of remaining thread remaining on the part piece becomes too long.

[Means for Solving the Problems] The present invention provides an air bag outer periphery sewing device comprising a sewing device and an airbag setting device, in which the airbag setting device includes a movable table, and the movable table is used as a sewing position. A first drive mechanism for reciprocating movement from the original position, a second drive mechanism for moving the movable base from the sewing position to the thread cutting position, and a circular part of the airbag to be sewn installed on the movable base. A rotating mechanism that rotates the piece in synchronization with the needle drop of the sewing attachment, a holding mechanism for the circular part piece, a first stopper mechanism for stopping the movable base at a predetermined position when returning to its original position, and a sewing machine for the movable base. A second stopper mechanism for stopping the circular part piece at a predetermined position when moving to a certain position, a positioning means for setting the circular part piece in the rotation mechanism, and a control means for controlling the drive of the various mechanisms described above. The rotation mechanism includes a circular lower rotary plate and a rotational drive source, and the presser mechanism includes an elevating means, a rotary shaft that can be raised and lowered thereby, and a circular part fixed to the rotary shaft and on the lower rotary plate. The first stopper mechanism includes a first abutting body provided on the movable table, a support body provided on the base, and a circular upper rotary plate that presses the piece. The second stopper mechanism includes a second abutting body provided on the movable base and an eleventh impacting body that occupies the first abutting body and buffers and stops the movable base when returning to the position. A movable support body whose position can be changed; and a second buffer body which is installed on the movable support body and comes into contact with the second abutting body to buffer and stop the movable base when the movable base is moved to the sewing position. The present invention attempts to solve the above-mentioned conventional problems by providing a detection means for detecting a predetermined drive amount in each of the drive sources constituting the first drive mechanism and the second drive mechanism. [Function] According to the present invention, the positioning of the parts to the lower rotary plate can be easily done by using the reference position on the guide plate, and the movement of the movable table from the original position to the sewing position can also be performed at the second sewing position. The stopper mechanism allows for appropriate adjustment in response to changes in the size of the part pieces. In addition, when cutting the louver thread after the M-manufacturing operation is completed, the second drive mechanism moves the movable table toward the original position by the minimum amount necessary to cut the louver thread, so that the louver thread to be pulled out is kept at an appropriate minimum amount. can do. [Embodiment of the Invention] An embodiment of the invention will be described based on the drawings. Note that the same parts as in the conventional example are given the same reference numerals in the explanation. FIG. 1 is a partially sectional side view showing the airbag outer periphery stitching device according to this embodiment. In the figure, reference numeral 1 denotes a moving platform equipped with a rotating mechanism, a presser mechanism, etc., which will be described later. It is designed to be able to reciprocate from 1 (left end in the figure) to the sewing position (right side in the figure). 2 is a two-needle double chain stitch sewing machine manufactured by &i; 4 is a motor as a rotational drive source; 5
is a circular lower rotary plate rotated by this motor 4 in synchronization with the needle drop of the sewing machine 2, and the motor 4 and the lower rotary plate 5
The rotation mechanism is constructed by: 6 is a rotating part fixed to the moving table l, 7 is this rotating part 6
8 is an upper rotary plate for presser fixed to the lower end of the rotary shaft 7, which is circular in shape and concentric with the lower rotary plate 5. It has become.
Further, the upper end of the rotating shaft 7 is rotatably connected to one end of a drive shaft 9, this drive shaft 9 is rotatably attached to a support point IO, and the other end of the drive shaft 9 is connected to a cylinder l1 as a lifting means.
It is connected to the piston shaft of. These, upper rotating plate 8,
A holding mechanism is constituted by a cylinder 11 and the like.

2l is an L-shaped first abutting body fixed to the lower surface of one end (the left end in the figure) of the moving table l; 22 is an L-shaped support fixed to the upper surface of the base 23; A shock absorber 24 as the 1Mth impactor is mounted on the moving platform 1.
When returning from the sewing position to the original position, the first abutting body 2l contacts the end of the shock absorber 24, so that the movable table 1 can be damped and stopped at the predetermined original position. A first stopper mechanism is constituted by the first contact body 21, the support body 22, the shock absorber 24, and the like.

25 is an L-shaped second contact body fixed to the lower surface of the other end of the movable table l (the right end in the figure); 26 is the movable means 3 attached to the base 23;
A movable support 27 installed via the movable support 26 is mounted on the movable support 26 and comes into contact with the second abutting body 21 when the movable base l is moved to the sewing position, thereby causing the movable base l to perform a predetermined sewing process. This is a shock absorber that serves as the 21st impacting body that buffers and stops the vehicle at a certain position. The movable means 30 includes a movable body 30a and this movable body 3.
0a, and a ball screw 30b for horizontal movement inside the ball screw 30b. The movable support body 26 is fixed to the movable body 30a through a slit formed in the guide tube 30d in the axial direction.
As it moves, its position can be changed by the 2g1 clause. A second stopper mechanism is constituted by the second abutting body 25, the movable support body 26, the shock absorber 27, the movable means 30, and the like. 28 is a first cylinder installed on the base 23 for reciprocating the movable table l between the original position and the sewing position, and the piston shaft end of the cylinder is fixed to the first abutting body 21. ．． A first drive mechanism is operated by the first cylinder 28 and the first arm contact body 2l. 29 is! After finishing the sewing, a second cylinder installed on the second abutment body 25 is used to move the movable table 1 from the sewing position to the thread cutting position (minimum pulling out position of the louver thread).
The tip of the piston shaft is brought into contact with the movable support 26 . Second cylinder 29, second contact body 2
5 constitutes a second drive mechanism. Incidentally, the first cylinder 28 and the second cylinder 29 are respectively provided with sensors 28a and 29a as detection means to detect the amount of movement of the drive shaft of each cylinder. Reference numeral 3l denotes a guide plate as a positioning means, and this guide plate 31 is fixed to the movable table l so that its upper surface is opposed to the lower surface of the lower rotating plate 5, while the guide plate 31 is The center of the arc coincides with the center of rotation of the lower rotating plate 5. As shown in FIG. 2(a), this guide plate 3l has a disk shape with an outer circumference having a larger diameter than the lower rotary plate 5, and has a central portion that fits with the motor 4, and a portion near the needle drop point (as shown in the figure). The right edge) or the notch is sharp. The periphery of the guide plate 31 is provided with alignment iA. B. C. D is prominent. Line segments A and B are each formed in a linear shape passing through the center of the guide plate 3l, an extension of line segment C and an extension of line segment D each pass through the center of the guide plate 31, and line segment D is formed in line segment A. , B and 90''. Line segment C is formed to be at an angle of 45 degrees with line segments B and D.

On the other hand, alignment notches are also formed on each part piece. That is, Fig. 3(a),(b)
The figure shows the parts 12a constituting the airbag 12,
There is a plan view of 12b, 12a is the upper part, 12b
is the lower part, and the upper part 12a has notches a, b, and c formed on its peripheral edge, and when these notches a are aligned with the reference line A of the guide plate 31, notches b and c are formed on the upper part 12a.
are also shaped to meet the standards jiB and C, respectively. Similarly, there are notches al,
bl, cl, c2 are formed, and when notch a1 is aligned with notch a, notch bl is aligned with notch b,
Notches cl and c2 match notches C and C, respectively. The sea urchin is turning. The operation of this embodiment will be explained using the above configuration.

First, raise the upper rotary plate 8 and set the upper part l2a on the lower rotary plate 5. Since the diameter of the lower rotating plate 5 is smaller than the parts by more than the seam allowance, the periphery of the upper part 12a is spread out on the guide plate 3l. Next, the upper part 12
Align the notch a of a with the reference A of the guide plate 31, the notch b with the reference MAB, and the notch C with the reference line C, and then overlap the lower part 12b and align the notches al, bl, c.
l, c2 are the notches a, b, c, c of the upper part, respectively.
Match. As a result, the lower rotary plate 5, the upper side bar 12a, and the lower side bar! The center points of y12b match each other and the alignment is completed. Next, when the upper rotary plate 8 descends and presses each part piece,
The cylinder 28 is activated to move the moving table l toward the sewing position (towards the sewing machine 2). When the movable table 1 moves in the same direction, it stops when it comes into contact with the second abutting body 25 or the tip of the shock absorber 27 of the movable support body 26 in the second stopper mechanism.

Here, the position of the movable support 26 is determined by adjusting the ball screw 30b in the movable means according to the size of the workpiece to be sewn, specifically, the size of the part piece, so that the movable support 26 is moved in the sewing direction. When moving, the movable support 2 is configured to stop the first movement so that the outer edge of the part piece comes to the appropriate needle drop position.
Determine the position of 6. In this embodiment, a scale is formed on the cylindrical portion 30d to mark the position of the movable support 26 in accordance with the size of the part piece, while a scale is attached to the movable support 26 as a guide. Since the arrows are drawn, the movable support 26 can be partially set according to the size of the part piece quickly and easily. Then, depending on the position of the movable support 26, the second abutment pair 25 engages with it to stop the first movable member at a predetermined position. In addition, in FIG. 1, 31c is a pin for fixing the movable body 31a.

In this way, when the parts taught on the lower rotary plate 5 and the upper rotary plate 8 are set in the appropriate sewing positions, sewing begins. Both the upper and lower rotary plates rotate in synchronization with the needle drop, and a double chain stitch is applied to the outer edge of the part on the outer circumferential edge of both rotary plates. By the way, the size of the vertical rotation plate must be smaller than the diameter of the part piece, but if the diameter of the rotating plate is larger than the diameter of the part piece, or if the diameter of the part piece is If the diameter is extremely larger than the diameter of the plate, replace it with a rotary plate that has an appropriate diameter for the diameter of the part piece, and then set the part piece. When sewing is completed, first, the needle thread is cut by a moving knife and a fixed knife (not shown) inside the sewing machine 2. Then the second
The cylinder 29 in the drive mechanism operates to move the movable table l in a direction away from the sewing position, and the looper thread is pulled out from the looper. The amount of movement is set to be the required minimum amount of pulling out of the looper thread. When the moving table l moves, in other words, when the cylinder 29 makes a cylinder stroke of a predetermined amount, the sensor 29a detects this. In this way, when it is detected that the moving base l has moved by a predetermined amount, the thread trimming heater 2b is lowered by the cylinder 2a, and after cutting the louver thread, the thread trimming heater 2b is raised and returned to its original position. .

When the thread cutting operation is completed, the piston shaft of the cylinder 28 in the twA movement mechanism operates, and the moving table l is further moved from the sewing machine 2 in the direction of opening, that is, in the direction of the original position.
When the sensor 28a detects the return of the movable table l to the original position W1, the driving of the cylinder 28 is stopped, while the first abutting body 21 abuts the tip of the shock absorber 24 of the support body 22, and the movable table l will be buffered and stopped at a predetermined original position. Thereafter, the above steps can be repeated in sequence.

By the way, in the above-mentioned embodiment, the alignment means uses a reference position on the guide plate 3l to align the part piece and the lower rotary plate 5, or uses a laser. Alignment is also possible.

FIG. 3 is a diagram showing a case where a reference line is drawn on a part piece of the lower rotary plate 5 using a laser marker, and the positioning notch of the part piece is aligned with this line to perform positioning. In the figure, 32.32 is a laser marker installed on a stand or the like, and K is a reference line drawn on the part piece 12a by this laser marker 32.32. Each of these reference lines is a reference line drawn on the part piece 12a by the laser marker 32, 32 so as to pass through the center of the lower rotary plate 5. The positions of the laser markers 32 and 32 are set at appropriate positions so that each reference line passes through the center of the lower rotary plate 5. As shown in FIG. 3(b), a laser beam L is irradiated onto the upper part piece 12a of the lower rotary plate 5, and reference lines K, K are drawn as shown in FIG. 3(a). This drawn reference line K
, K, and align the positioning notches with the upper part piece 12a.
and the centers of the lower rotating plate 5.

However, in the above case, the reference line is drawn directly on the part piece using a laser, but as shown in Fig. 2(a)
Using the guide plate 3l shown in 2 & ili A, B, C,
By irradiating the laser beam in accordance with D and aligning the notch of the part piece with the reference line created by this laser beam, the reference line can be drawn more quickly, accurately, and easily using the laser beam. The subsequent steps are exactly the same as in the above embodiment.

According to this embodiment, necessary alignment can be easily and quickly performed depending on the time. [Effects of the Invention] Due to the above-described structural action, the present invention allows parts pieces constituting an airbag to be accurately and easily set in a device, while also allowing parts pieces of various sizes with different diameters to be set. Not only can it be handled appropriately, it can also be used for thread trimming after &i manufacturing.
Because it can be done easily! ! Product quality and sewing efficiency both improve.

[Brief explanation of the drawing]

FIG. 1 is a side view of one embodiment of the present invention, FIG. 2 is an explanatory diagram of a guide plate, and UA (a) is a plan view, and FIG.
b) is a plan view of the parts set on the guide plate, Figure 3 is an explanatory diagram of the parts, (a) is the upper part, and (b) is the lower part. FIG. 4 is an explanatory diagram showing an embodiment in which a laser beam is used to align the parts, and FIG.
FIG. 5 is a side view showing a conventional example, FIG. 6 is a perspective view of an air hug, and FIG. 7 is an explanatory diagram showing alignment of parts pieces in the prior art. The same figure (a
) is a plan view, and (b) is a partially cutaway view. In the figure, 1... Moving table 2... Sewing device 4... Rotating drive source 5 Lower rotating plate 8 Upper rotating plate 3 l... Positioning means 3 2, L... Positioning means applicant Juki Co., Ltd.

Claims (1)

[Scope of Claims] Consisting of a sewing device and an airbag setting device, the airbag setting device includes a moving table and a first drive mechanism for reciprocating the moving table between a sewing position and an original position. and,
a second drive mechanism for moving the movable table from the sewing position to the thread trimming position; and a rotation mechanism that rotates the circular part of the airbag to be sewn, which is installed on the movable table, in synchronization with the needle drop of the sewing device. , a holding mechanism for the circular part piece, and a first mechanism for stopping the moving table at a predetermined position when returning to the original position.
a stopper mechanism; a second stopper mechanism for stopping the moving table at a predetermined position when the moving table is moved to the sewing position;
The rotary mechanism includes a positioning means for setting the circular part piece in the rotation mechanism, and a control means for controlling the drive of the various mechanisms, and the rotation mechanism is configured to rotate the presser foot by means of a circular lower rotary plate and a rotational drive source. The mechanism includes a lifting means, a rotating shaft that can be raised and lowered by the lifting means, and a circular upper rotating plate that is fixed to the rotating shaft and presses a circular part piece on the lower rotating plate, and the first stopper mechanism is movable. A first abutting body provided on the base, a support body provided on the base, and a support body that is installed on the support body and comes into contact with the first abutting body when the movable base returns to its original position to buffer and stop the movable base. The second stopper mechanism includes a second abutting body provided on the movable table, a movable support provided on the base and whose position can be changed, and a movable support provided on the movable support and configured to control the sewing position of the movable table. a second shock absorber that contacts the second contact body and buffers and stops the movable table when moving to the first drive mechanism, and a drive source that constitutes each of the first drive mechanism and the second drive mechanism is provided with a predetermined drive source. An airbag outer periphery sewing device characterized by being provided with a detection means for detecting a driving amount.