JPH0744310Y2 - Fabric edge curl straightening device for sewing machine - Google Patents

Description

[Detailed Description of the Invention] [Industrial field of application] The present invention is directed to an end portion of a sewn product in which two cloths having curl-like curls at the end portion are piled up and down in a natural state such as a nit product. The present invention relates to a fabric edge curl straightening device for a sewing machine, which is used in the case of overedge stitching.

[Prior Art] Conventionally, an operator generally uses both hands to sequentially correct the curled end portion when overhanging the end portions of a sewn product composed of two upper and lower cloths having curled end portions. I was suturing.

[Problems to be Solved by the Invention] However, in the above-mentioned conventional case, it takes a lot of time and labor to correct the curled end portion, and the curled end portion is required to be manually corrected. The operation speed of the sewing machine had to be reduced compared to the sewing of the unsewn sewing material. Further, the quality of straightening of the curled end portion greatly varies depending on the skill level of the operator, and as a result, the high-speed sewing performance originally possessed by the sewing machine cannot be fully utilized and the sewing operation Not only the efficiency deteriorates, but also the finish of the sewn product tends to be uneven.

This invention was made in order to solve the above problems, and does not require any manual operation other than the initial setting, regardless of the combination of the curl directions of the upper and lower fabric edges. , Appropriate those curled ends,
An object of the present invention is to provide a fabric edge curl straightening device for a sewing machine, which can be surely corrected to improve the efficiency and quality of sewing work.

[Means for Solving the Problems]

In order to achieve the above-mentioned object, a cloth edge curl straightening device for a sewing machine according to the present invention comprises a sewn product support plate which guides the transfer of the sewn product by slidingly contacting a lower fabric of a sewn product in which upper and lower fabrics overlap each other. A sewing machine equipped with a sewing portion attached to the support plate so as to sew the upper and lower fabric edges while transferring the sewing material A first position fixed to an inclined position with respect to the transfer direction of the sewn product so that the curled end of the lower fabric is brought into contact with the curled end of the sewn product and the curled end of the sewn product is sequentially extruded and corrected. The curl correction part of the sewing machine and the curl-shaped end of the upper cloth of the sewn product can be switched to a state of being brought into contact with the curl-shaped end portion and a state of being inserted between the upper and lower cloths. Two upper and lower markings that extrude and correct the ends one by one A second curl straightening piece having an edge portion and arranged in an inclined posture with respect to the transfer direction of the sewn product, and a drive mechanism for switching and moving the second curl straightening piece between a correction working position and a non-working position. And a second curl straightening assisting piece capable of pressing the upper fabric from its upper surface in a state where the second curl straightening strip is inserted between the upper and lower fabrics of the sewn product.

[Action]

According to this invention, when sewing a sewn product consisting of upper and lower fabrics having curled end portions, the lower fabric of the sewn product is supported by the sewn product while the second curl correction piece is retracted to the non-acting position. The second curl straightening piece is slidably brought into contact with the plate, the start end portion of the suture is set to the sewing portion, and then the second curl straightening piece is moved to a predetermined straightening position to move the second curl straightening piece.
The curled ends of the upper and lower fabrics are brought into contact with the curled ends of the upper fabric, or inserted between the upper and lower fabrics. Then, when the second curl straightening piece is inserted between the upper and lower fabrics, the curl straightening assisting piece presses the upper fabric from the upper surface of the upper fabric. In this state, by operating the sewing machine, sewing is carried out as usual while transferring the sewn product, but at this time, when both ends of the upper and lower fabrics are curled inward and the ends of the upper and lower fabrics are both curled. If both of them curl downward, the curling edge of the upper fabric is not lifted by the pressing force of the above curl straightening assisting piece, and the curl straightening edge of the second curl straightening piece is surely secured. When the curled ends of the upper and lower fabrics are both curled outward, the lower curl correcting edge of the second curl correcting piece arranged on the upper surface side of the upper fabric is surely contacted. As the sewn product is transferred, each curled end is extruded and straightened by the straightening edge of the second curl straightening piece and the first curl straightening section.
The curled ends of the sewn product can be accurately corrected regardless of the combination of the curl directions of the upper and lower fabric ends.

[Embodiment of the Invention] An embodiment of the invention will be described below with reference to the drawings.

1 and 2 are perspective views showing a fabric end curl straightening device of a sewing machine according to an embodiment of the present invention. In the same figure, (32) is a sewing support plate, and this support plate (32) is As shown in FIGS. 6 to 8, the upper and lower fabrics (39),
The lower cloth (38) of the sewn product (45) in which the sewn products (45) are overlapped with each other is slidably contacted to guide the transfer of the sewn product (45), and the upper surface thereof is formed as a smooth horizontal surface. (46) is a sewn portion, and the sewn portion (46) is flush with the upper surface of the support plate (32) and fixed to the sewing machine main body with a needle plate (33).
And a presser foot piece (34) arranged so as to face the upper part thereof and a presser arm (36) for holding the cloth presser piece (34) up and down via a hinge (35). It is arranged along the side edge of 32), and the sewing material (45) is transferred in the direction of the arrow (a), and the edge portions of the upper and lower fabrics (39) and (38) are sewn together by stitching. A conventional overedger sewing machine having the above construction is constructed.

In the overedged stitch sewing machine having the above-described structure, (42) is a cut portion formed at a corner portion of the sewn product support plate (32) on the hand side for transferring the sewn material to the sewn portion (46). The curl-shaped end (38a) of the lower fabric (38) in the sewn product (45) is formed by inclining the side edge of the support plate (32) facing the sewage 42) with respect to the transfer direction (a) of the sewn product (45). ) Is brought into contact with the sewn product (45), the curled end (38a) of the sewn product (45) is extruded to the open sides of the upper and lower fabrics (39) and (38) in order, and the first curl is fixed. Division (44)
Are configured.

(1) is a mounting plate for the entire curl straightening device (40), which is fixed to the main body of the overedge sewing machine via mounting screws (2) and (2). Reference numeral (3) is a fulcrum shaft, and the entire curl straightening device (40) is swung in an ascending posture and a descending posture by expanding and contracting the first cylinder (10) as shown by arrows (b)-(c). Configure the fulcrum of time. Reference numeral (4) is a slide mount, and the slide mount (4) has a protrusion (5) having a hole through which the fulcrum shaft (3) penetrates and a piston rod (9) in the first cylinder (10). ) A projection portion (6) for connecting the joint portion (8) at the lower end via a pin (7) is integrally provided.

Reference numeral (17) is a sliding body, and the sliding body (17) is formed with a plurality of long grooves (41) formed along the longitudinal direction of the sliding body (17) and fitted into the long grooves (41) and screwed into the mounting base (4). Guide shaft (2
As shown by arrows (d)-(e) through 0) and (20), it can be slidably moved in the perspective direction with respect to the sewn portion (46) (hereinafter, the sewn portion (46) will be in close proximity. The movement is leftward, and the movement away from the sewing portion (46) is called rightward). (12) is the second cylinder, and this second cylinder (12)
Is a drive mechanism for moving the sliding body (17) leftward and rightward, and is a downward bending piece (4a) formed at the right end of the mounting base (4).
And the sliding body (17) is provided so as to extend between the downward bending piece (17a) formed at a position near the left end.

(43) is a second curl straightening piece mounting plate bent in an L-shape in plan view. The base end of the mounting plate (43) is fixed to the left end portion of the sliding body (17) and is free from play. A second curl correction piece (31) is continuously provided at the end. When the second curl straightening piece (31) is brought into contact with the curled ends (39a) and (38a) of the upper and lower fabrics (39) and (38) of the sewn product (45), the sewn product (45) Of the sewn product (45) indicated by the arrow (a) so that the curled ends (39a) and (38a) are sequentially extruded and straightened toward the open sides of the upper and lower fabrics (39) and (38) with the transfer of The upper and lower fabrics (3
It has two upper and lower straightening edges (31a) and (31b) for straightening the inward curled ends (39a) and (38a), respectively, when inserted between 9) and (38).

(28) is a curl correction auxiliary piece mounting base. This mounting base (28)
Is connected via a support shaft (37) to a bracket (18) fixed to the upper surface near the left end of the slide member (17) so as to be vertically swingable around the support shaft (37), and the slide member ( The direction of the arrow (f)-(g) due to the expansion and contraction of the third cylinder (23) that is laid across between the protrusion (19) formed near the right end of 17) and the mounting base (28). It is configured so that it can be swung freely.

(30) is a strip-shaped curl correction assisting piece bent in a substantially V shape in plan view. The curl correcting assisting piece (30) is fixed to the mounting base (28) through a mounting screw (29). In addition, the upper cylinder (39) of the sewn product (45) is pressed from the upper surface of the sewing machine (45) by the drive swing of the mounting base (28) in the direction of the arrow (g) by the third cylinder (23). Has been done.

In the fabric edge curl straightening device for the overedge stitch sewing machine having the above-described configuration, the first cylinder (10) and the second cylinder (12) move the second curl straightening piece (31) into a straightening working position and a non-working position. A drive mechanism for switching and moving to and is configured. The drive control device for this drive mechanism and the third cylinder (23) is configured as shown in FIG.

In FIG. 11, (47) is a knee switch attached to the main body of the sewing machine. In response to a command signal from the controller (48) based on the operation of the knee switch (47), the first to the first
Switching devices (49a), (49b), which correspond to the third cylinders (10), (12), and (23), respectively, such as solenoid valves,
The first to third cylinders (10), (12) and (23) are automatically controlled according to a preset sequence via the operation selection device (49) composed of (49c). This drive control device uses the combination of the curl directions of the upper and lower cloths (39) and (38) in the sewn product (45) to curl the ends (39a) and (38a) of the first to third cylinders ( The switching movement mode of 10), (12) and (23) is shown below.
Choose to the street.

One of them is the second one, as shown in FIGS. 3 (A) and (B).
By extending the cylinder (12) and holding the entire curl straightening device (40) leftward, and expanding and contracting only the first cylinder (10), the second curl straightening piece (31) is moved to the first position. 3 (B) and the non-acting position shown in FIG. 3 (A) are switched and moved (hereinafter referred to as the first form), and the other one is shown in FIG. 4 ( A), (B),
As shown in (C), the second curl straightening piece (31) is shown in FIG. 4 (B) by combining the expansion and contraction operations of the first cylinder (10) and the second cylinder (12). A mode in which the intermediate position is sandwiched between the correction working position shown in FIG. 4C and the non-working position shown in FIG.
It is called the form).

Further, in the third cylinder (23) of the first embodiment, the curl straightening assisting piece (30) is replaced with the second curl straightening piece (31).
When the second curl correction piece (30) is held in the extended state so as to be in close contact with the upper side, and the curl straightening assisting piece (30) is driven and rocked in the perspective direction with respect to the second curl straightening piece (31). It is to be expanded and contracted.

Next, regarding the operation of the above configuration, the curled end portions (39a), (38) of the upper and lower fabrics (39), (38) in the sewn product (45).
The description will be made separately for each combination of curl directions in a).

Edges (39a), (38a) of upper fabric (39) and lower fabric (38)
Targeting the sewn product (45) curled outwards together; the first mode described above is selected as the operation of the drive mechanism in this case, and first, the entire curl straightening device (40) is moved to the first cylinder ( Due to the expansion and contraction of 10), as shown in FIG.
Place the sewn product (45) on the support plate (32) as shown in FIG. 6 (A) in a state in which the sewn product (45) is swung upward around the fulcrum shaft (3) and retracted to the inoperative position. At the sewing start end, the cloth presser piece (34) and the needle plate (3
3) Insert between and.

When the knee switch (47) is turned on in this state, the first
The expansion of the cylinder (10) causes the entire curl straightening device (40) to swing in the direction of the arrow (c) and is switched to the corrective action position shown in FIG. 3 (B), and the second curl straightening piece (31). The lower straightening edge (31b) of the lower edge of the upper fabric (39) contacts the curled edge (39a) of the upper fabric (39) as shown in FIG. 6 (B), while the curled edge (38a) of the lower fabric (38). Is the first curl correction unit (4
4) abut.

Next, by depressing a sewing machine drive pedal (not shown) to start the operation of the sewing machine, the sewn product (45) is transferred in the direction of the arrow (a) as desired, and the upper and lower fabrics (39), (38) are moved. ) The overedge sewing of the edge is performed.
At this time, as the sewing progresses, the curl-shaped end portion (39a) of the upper fabric (39) is sequentially extruded and corrected by relative movement with the lower correction edge portion (31b) of the second curl correction piece (31). At the same time, the curled end (38a) of the lower fabric (38) is first
The extrusion movement is sequentially corrected by the relative movement of the curl correction section (44).

As described above, when the knee switch (47) is turned on again at the time when the sewing for the predetermined time (T1) is completed, first, the entire orthodontic device (40) is arrowed by the contraction of the first cylinder (10) ( It is swung in the direction b) and retracted to the non-acting position shown in FIG. 3 (A), and the next sewing posture is obtained.

FIG. 9 is a timing chart in the case of the operation shown in the above, and as is apparent from the same figure, the second cylinder (1
2) is left held leftward and the third cylinder (2
3) remains extended and retained. Further, the same figure expresses the repetition of the operation of, and (T) is the sewing work time.

When the end (39a) of the upper fabric (39) is curled inward and the end (38a) of the lower fabric (38) is curled outward, the drive in this case; The second mode described above is selected as the operation of the mechanism. First, the second curl straightening piece (31) of the curl straightening device (40) is expanded and contracted by the first cylinder (10) and the second cylinder (12). By retracting the curl straightening assisting piece (30) to the non-acting position shown in FIG. 3 (A) and contracting the third cylinder (23), the curl straightening assisting piece (30) becomes the second curl straightening piece (31) as shown in FIG. In the state in which they are separated from each other, the sewn product (45) is placed on the support plate (32) as shown in FIG. 7 (A), and the sewing start end portion thereof is sewn at the sewing portion (46). Insert between (34) and throat plate (33). Here, the upper cloth (39) is rolled up, the first cylinder (10) is extended by the first ON operation of the knee switch (47), and the entire curl straightening device (40) is lowered to lower the lower cloth (38). Is pressed by the second curl straightening piece (31), and the outward curled end portion (38a) of the lower fabric (38) contacts the first curl straightening portion (44).

Subsequently, the upper fabric (39) that had been rolled up is returned to its original state, and then the second ON operation of the knee switch (47) causes the third cylinder (23) to extend and the mount (28 ), The curl correction assisting piece (30) swings downward around the support shaft (37) and presses the upper cloth (39) from its upper surface as shown in FIG. 7 (C). As a result, the inward curled end (39a) of the upper fabric (39) becomes the second curl straightening piece (31).
The upper correction edge (31a) is strongly abutted.

Then, as in the case of, by depressing the sewing machine drive pedal to start the operation of the sewing machine, the overedging as usual is performed, and at this time, the upper cloth (39)
The curled end (39a) of the second curl straightening piece (31) relative to the upper straightening edge (31a) of the second curl straightening piece (31), and the curl end (38a) of the lower fabric (38) is Curl correction unit (4
By the relative movement with 4), they will be extruded and straightened one by one.

As described above, the third ON operation of the knee switch (47) is performed when the sewing for a predetermined time is completed. By this operation, first, the second cylinder (12) contracts, the curl straightening device (40) retreats to the right through the sliding body (17), and the third
The position shown in Figure (A) is reached, and then the first cylinder (1
0) contracts and the curl straightening device (40) is entirely indicated by the arrow (b).
At the same time, the third cylinder (23) contracts and the curl correction assisting piece (30) moves upward around the support shaft (37) while swinging in the direction and retracting to the non-acting position shown in FIG. 3 (A). It swings and returns to the posture shown in FIG. 5, and after the elapse of a preset time (T), the entire curl straightening device (40) is moved to the left and the next sewing posture is obtained.

FIG. 10 is a timing chart in the case of the operation shown in the above, in which (T) is the first cylinder (10) and the third cylinder from the third ON operation of the knee switch (47).
A delay time until the cylinder (23) starts contracting. This delay time (T) is set so that the curl straightening operation (40) by the second cylinder (12) is completed within the time (T). Is set in advance. Further, the same figure expresses the repetition of the above-mentioned operation.

Edges (39a), (38a) of upper fabric (39) and lower fabric (38)
Both target the inwardly curled sewn product (45); in this case, as in the case, the second mode described above is selected as the operation of the drive mechanism, and the sequence operation is the same as in the above case. The difference from the above case is that the curl-shaped end portion (39a) of the upper fabric (39) and the curl-shaped end portion (38a) of the lower fabric (38) are located above the second curl straightening piece (31). It is only extruded and straightened by the straightening edge portion (31a) and the lower straightening edge portion (31b). Therefore,
Operation explanatory diagrams corresponding to FIGS. 7 (A), (B), and (C) are shown in FIGS. 8 (A), (B), and (C), and a detailed description thereof will be omitted.

The timing chart in this case is also the same as in FIG.

In addition, combinations of curl directions other than the above cases,
For example, there is a sewn product (45) in which the end (39a) of the upper cloth (39) is curled outward and the end (38a) of the lower cloth (38) is curled inward. By reversing the vertical direction of (45) or by recombining the operation mode of the drive mechanism and storing it in the controller (48), curl correction can be performed as desired regardless of the combination. It is possible.

Further, in the above embodiment, an air cylinder is used as a drive mechanism and is configured to be controlled by an electric signal. However, even if all are electric mechanisms, all are actuator type actuators that use fluid such as air. Even if it is configured by a combination, the same effect as that of the above-described embodiment can be obtained.

Further, as in the above case, when inserting the second curl straightening piece (31) between the upper and lower fabrics (39), (38), flipping up the end portion of the upper fabric (39) and inserting. Due to
In the case of the above, the operation mode of the drive mechanism also includes the first
It is possible to select the form.

[Effect of the Invention] As described above, according to the present invention, the normal speed can be maintained without any manual operation by the operator other than the initial setting and the operation speed of the sewing machine being reduced. Also, depending on the curl direction of the upper and lower fabric edges, the second curl straightening piece is contacted with the curl-shaped end portion of the upper fabric or is inserted between the upper and lower fabrics, and the curl straightening assist is provided. By pressing the upper fabric with a piece,
No matter what combination of curl directions,
The first curl straightening portion, the second curl straightening piece, and the curl straightening assisting piece synergize each curl end portion appropriately,
You can surely correct it. Therefore, the high-speed sewing performance originally possessed by the sewing machine can be fully utilized to improve the efficiency of the sewing work, and the curled end portion can be corrected without variation to improve the quality of the sewn product.

[Brief description of drawings]

1 and 2 are perspective views showing a fabric edge curl straightening device for a sewing machine according to an embodiment of the present invention, FIG. 3 (A),
(B) and FIGS. 4 (A), (B), and (C) are side views for explaining the operation mode of the drive mechanism, and FIG. 5 is a perspective view of the main part for explaining the operation of the correction assisting piece. 6 (A),
(B), FIG. 7 (A), (B), (C) and FIG. 8 (A), (B), (C) respectively explain the operation corresponding to the combination of the curl directions of the upper and lower fabric ends. 9 and 10 are timing charts for explaining the operation of the drive mechanism in different operation modes, and FIG. 11 is a schematic block diagram of the drive control device. (10) …… First cylinder, (12) …… Second cylinder,
(23) …… Third cylinder, (30) …… Curl straightening auxiliary piece, (31) …… Second curl straightening piece, (31a), (31b)
…… Straightening edge, (32) …… Sewing support plate, (38) …… Bottom fabric, (39) …… Top fabric, (38a), (39a) …… Curl end, (44)… … First curl correction part, (45) …… Sewn product, (46) …… Sewing part, (47) …… Knee switch, (4
8) …… Controller.

Claims (1)

[Scope of utility model registration request] 1. A sewn product support plate that guides the transfer of the sewn product by slidingly contacting the lower fabric of the sewn product in which the upper and lower fabrics are overlapped, and the edge portions of the upper and lower fabrics while transferring the sewn product. In a sewing machine having a sewing part mounted on the support plate for sewing, a sewn product is brought into contact with a curled end of a lower fabric at a transfer-hand side near the sewing part. The first curl straightening portion fixed in an inclined posture with respect to the transfer direction of the sewn product so as to sequentially push out and correct the curled end part of the lower fabric with the transfer of the The upper and lower parts can be switched between a state in which they are in contact with the upper fabric and a state in which they are inserted between the upper and lower fabrics, and the curl-shaped end portions of the upper fabric and the upper and lower fabrics are sequentially extruded and corrected as the sewn product is transferred.
A second curl straightening piece having two straightening edges and arranged in an inclined posture with respect to the transfer direction of the sewn product, and the second curl straightening piece is switched and moved between a straightening working position and a non-working position. A fabric end of a sewing machine comprising a drive mechanism and a curl straightening auxiliary piece capable of pressing the upper fabric from its upper surface in a state where the second curl straightening strip is inserted between the upper and lower fabrics of the sewn product. Curling device.