JP2551223Y2 - Sewing machine - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sewing machine that folds and sews both side edges (ear portions) of an isometric material of equal length.

[0002]

2. Description of the Related Art Conventionally, a double-head sewing machine provided with a pair of right and left sewing machines for folding and sewing both ears of a raw towel cloth into three has been widely used by towel manufacturers. This sewing device is used for thin towels that mainly use bath towels.
It has gained popularity because it has a meandering follow-up means and can efficiently sew both ears.

However, as the standard of living has improved recently, the number of thick towels incorporating a pattern on towels has also increased, and both ears of a raw towel connected with a castor have been folded and sewn in three. At that time, the toweling becomes thinner or thicker on the way, making it difficult to fold and sew it neatly.

As shown in FIG. 4, both ears a of a raw towel web A having a thick portion a1 (a densely woven ground-filling woven portion) incorporating such a pattern are cut by a conventional sewing apparatus.
When sewn and sewn, three folds b at thick part a1
1 is distorted, it is folded in two, the edge fuzz comes out, or the ear part a protrudes from the spiral guide, and it becomes impossible to continue folding in three, so that the finish of the towel is remarkably deteriorated.

[0005]

The problem to be solved is that three long ears are neatly folded on a long material such as a raw towel having a thick portion scattered over the entire width. Is not sewn. The present invention
Swirling guides on both sides of thick parts
Fold it easily and clean it in three places and sew it neatly
It is an object.

[0006]

SUMMARY OF THE INVENTION The present invention relates generally speaking inner pair of right and left vortex winding guide said thick portion relative to the thick portion of the thickness of the long object is detected just before reaching the spiral guide And move easily by the moving means in the guide.
Long with left and right sewing machines folded inward
The sewing speed is reduced by decreasing the feed speed of the measuring object and the sewing speed of the sewing machine .

[0007]

FIG. 1 is an explanatory plan view of a main part of a sewing machine according to the present invention, FIG. 2 is an explanatory view of the left side, and FIG. 3 is an explanatory perspective view of only the left side.

In FIG. 1 to FIG. 3, a sewing machine 1 for sewing both ears a of a raw towel material A is a long towel raw material having thick portions over the entire width at intervals in the longitudinal direction. The anti-A is transported in the direction of arrow X by the feeding means 10 of the feed rollers 11 and 12, and the ears a on both side edges of the raw towel A are folded into three by the left and right spiral guides 21 and 22, respectively. > After that, sewing is performed with the left and right sewing machines 25 and 26. Check the step between the thick and thin parts of the towel web A.
The thickness detector 31 for generating the output signal is connected to the spiral guide.
It is arranged on the upstream side in the transport direction of 21 and 22, respectively. Ma
In addition, each of the thickness detectors 31 and each of the spiral guides 21 and 22
Use a pulse encoder to detect the distance to the front end.
A controller (not shown) is set in advance. Swirl
Guides 21 and 22 and sewing machines 25 and 26
The transverse direction (tao) orthogonal to the direction of conveyance by the feeding means 10
Air cylinder for moving in the width direction of the raw material A)
Moving means 35, 35 such as
10 and the sewing speed of sewing machines 25 and 26.
Each is configured to be variable. And the thickness detectors 31, 3
After the detection signal of No. 1 is issued,
Just before the minute reaches the spiral guides 21 and 22,
Speed of the feeding means 10 via the machine and each sewing machine 2
At the same time as reducing the sewing speed of 5, 26,
Distances 21 and 22 and sewing machines 25 and 26 are set at a predetermined distance from each other.
Move by moving means 35, 35 to approach
The sewing machine 2 divides the folded part b1 of the thick part a1
Sewing is performed at steps 5 and 26. Thereafter, the feeding means 10 and the
At the same time as increasing the sewing speed of the
Move spiral guides 21 and 22 and sewing machines 25 and 26
By means 35, 35, they are moved away from each other and returned to the original position outside.

The feed rollers 11, 12 of the feeding means 10
Is a rubber roller which is driven by a variable speed motor (not shown) of an inverter in synchronization with the feed speed of the feed dogs (upper feed dog 27a and lower feed dog 27b) of the sewing machines 25 and 26. The meandering of the raw towel web A is corrected by the cross guider before the normal feeding means 10.

In the present example, an electric field proximity switch is used for the thickness detector 31, and a towel is placed on the horizontal frame 36 of the machine.
It is fixed at a distance slightly higher than the thickness of the thick portion a1 of the raw material A (the height is adjustable). The distance between the detector 31 and the front ends of the spiral guides 21 and 22 is measured, and the distance is measured by a controller.
In this example as a part, it corresponds to the distance to the pulse encoder
The number of pulses to be performed is set in advance. This
And the thickness detectors 31 and 31 are
Pulses at the same time as detecting a step in a thin part and generating a signal
The encoder counts the number of pulses and
When the number of pulses reached, the thick part of the towel web A swirled.
The front ends of the guides 21 and 22 will be reached. So before
The controller gives the feeding speed to the feeding means 10 and the
Send a signal to the shins 25 and 26 to reduce the sewing speed
And the spiral guides 21 and 22 and the sewing machine 2
Moving means 3 so that the moving means 5 and 26 approach each other by a predetermined distance.
Signals are sent to 5, 35 . In the present example, the thickness change for the caster to which the towels are connected one by one is set to cancel.

The dough presser 40 is mounted on the mounting tables 28, 2 of the sewing machine.
9, L-shaped legs 41 fixed to the support arms 28a and 29a extending from above so as to be relocated, and pressing the corners between the ear portions a and the present fabric (pile weave or the like) to erect the ear portions a; The leg 4
1 is extended downward, and a block 42 fixed to the support arms 28a and 29a, and an ear a fixed and movably fixed to an arm 42a extending rearward of the block 42 are kept upright. And a pressing plate 43 for stabilizing the movement of the anti-A.

On the front side of the horizontal sewing table 25a, 26a provided on the opposite side of the left and right sewing machines 25, 26,
Spiral guides (also referred to as horns) 21 and 22 are fixed, and the ears a are easily erected and easily inserted.
Is folded in three, and the upper and lower feed dogs 27a, 27
b is sent as a three-fold part b. At the position of the feed dog, a three-folded portion b
Is sewn. If it is a relatively thin towel material A, it is sewn at a feed speed of, for example, about 25 m / min.
Thick part a1 thickened by weaving patterns at high density
, The feed speed is reduced to about half (deceleration is selected according to the thickness), and the spiral guides 21 and 2
Guide 21 so that ear a is easily folded into three in 2,
22 and the sewing machines 25 and 26 are moved inward. The adjustment of the feed speed and the adjustment of the sewing speed of the sewing machine are performed by the inverter motor for the feed means 10 and the motor M for the sewing machine.

The sewing machines 25, 26 are mounted on rails 47a, 47b extending in the transverse direction of the machine base F via trochanters 44 so as to be movable without any backlash.
a is fixed on mounting tables 28 and 29 movably mounted on rails 28b and 29b such as a linear way. The mounting bases 28 and 29 are mounted on brackets B of the inverter motor M for the sewing machine with brackets B extending downward from the outer end surfaces.
c and 29c are suspended. Bracket B has a base 2
The output shaft ends of the air cylinders 35 fixed to the lower surfaces of the bases 8a and 29a are connected to each other.
8a and 29a can be moved in the transverse direction. That is, when the air cylinder 35 is contracted from the extended position, the sewing machines 25 and 26 are moved inside each other. The moving position is adjusted by appropriately providing a stopper. Base 28
The nuts 45a, 46a screwed to the ball screws 45, 46 are fixed to the lower surface, and the ball screw 4a
By turning the wheels 5 and 46 with a handle or a motor, the sewing machines 25 and 26 are moved to appropriate positions according to the width of the raw towel web A. At this time, the air cylinder 35 is in an extended state. In the drawing, reference numeral 48 denotes a sewing thread bobbin support, and reference numeral 49 denotes a V-belt connecting the sewing machine motor M and the sewing machine power input pulley P.

[0014] The towel material A after the sewing of the ear a is
The belt is conveyed to the next step by the belt conveyor 51. The belt conveyor 51 is also driven in the direction of the arrow so that the speed can be changed by the inverter motor.
The peripheral speed is set higher than the feed speed of 27b. At the time of sewing the ear part a of the thick part a1, the speed is also reduced.

Next, the operation of the lockstitch machine 1 will be outlined. First, according to the width of the towel web A, the ball screw 4
5 and 46 are turned to set the interval between the left and right sewing machines 25 and 26, and the cloth presser 40 is also set as described above, and the thickness detectors 31 and 31 are also left and right ears a where the difference in thickness is good. Set to. The thin standard portion at the tip of the raw towel web A is manually introduced into the spiral guides 21 and 22 to form a three-fold portion b, and trial sewing is performed to perform initial setting. Then, enter automatic operation.

When the thick portion a1 is detected by the thickness detectors 31, 31, the spiral guides 21, 22 are sent from the thickness detectors 31, 31.
Calculate the constant distance to the tip of
The air cylinder 35, which has been detected first by estimating the arrival at the tip of the guide 1 (there is a slight delay in the left and right even though the meandering is corrected by the cross guider), is contracted, and the spiral guide 21 ( 22) and the sewing machine 25 (26), and the feed means 10 and the sewing machine feed teeth 27a,
27b, the needle 27, and the speed of the belt conveyor 51 are reduced.
The arrival is similarly estimated by the thickness detection signal on the side slightly delayed, and the air cylinder 35 on that side is also contracted. As a result, the thick portion a1 is easily folded into three in the spiral guides 21 and 22, and the three-fold portion b1 thickened by the sewing machines 25 and 26 is also reliably sewn. Extend the air cylinder 35 on the side where the sewing has been completed, and
1, and (22) and the sewing machines 25 and (26) are returned to the outside, but the speed of the feeding means 10 and the sewing machine feed teeth 27a and 27b, the needle 25, and the belt conveyor 51 is reduced when the sewing on the delayed side is completed. Is returned to the original speed together with the expansion and contraction of the air cylinder 35 to the outside. At the end of sewing, the distance from the thickness detector 31 to immediately after the sewing needle 27 and the thick portion a
The length of 1 is grasped and estimated by exchanging the number of pulses corresponding to the feed amount of the feed means 10.

In the following, the order and length of thick sections having different lengths are stored in the control means, and the end of sewing is estimated to take measures. In addition, when the thick portion a1 is folded in three in the spiral guides 21 and 22, the rotating roller can be fed laterally and outwardly, or auxiliary means can be added. Further, in addition to the raw material A for towels, the lockstitch machine 1 may be applied to ear sewing of a blanket or curtain material.

[0018]

As described above, according to the sewing machine of the present invention, when the both side edges of the portion thicker than the overall average thickness are folded into three and sewn, they are neatly folded and sewn into three. Will be.

[Brief description of the drawings]

FIG. 1 is an explanatory plan view of a main part of a sewing machine of the present invention.

FIG. 2 is an explanatory diagram of the left side surface.

FIG. 3 is an explanatory perspective view of a main part of only the left side.

FIG. 4 shows a thicker ear 3 which has been a problem in the prior art.
It is explanatory drawing of a folding state.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Sewing machine 10 Feeding means 21, 22 Spiral guide 25, 26 Sewing machine 31 Detector 35 Moving means A Long object a1 Thick part a Side edges (ears)

Claims (1)

(57) [Scope of request for utility model registration] 1. A long object having thick portions with an interval in the longitudinal direction over the entire width is transported in the longitudinal direction .
Feeding means, and the side edges on both sides of the long object.
Left and right to fold in three so as to be rolled inside
A pair of spiral guides, and
To sew the side edges that are each placed and folded in three
In a sewing machine equipped with a pair of left and right sewing machines, a signal is detected by detecting a step between a thick portion and a thin portion of the long object.
The thickness detector that is emitted
And the swirl guide and the sewing machine
In the transverse direction perpendicular to the transport direction by the
Moving means for transporting,
Variable speed and sewing speed
And, detects the distance of the thickness of the detector and the front end of said spiral guide
Set the controller in advance so that the thickness is detected
After the container emits a signal, the thick part of the long object
Just before reaching the guide, the feed through its controller
Means to reduce the conveying speed and the sewing speed of the sewing machine.
At the same time, the spiral guide and the sewing machine
Is moved by the moving means so as to approach a predetermined distance
And fold the thick part of the long object into three parts with the spiral guide.
And then sewn with the sewing machine, the feeding means and
When the sewing speed of the sewing machine is increased and returned to the original speed,
Moving the spiral guide and the sewing machine to the moving means
A sewing machine characterized in that the sewing machine is moved away from each other and returned to its original position outside.