JP3751151B2 - Edge control sewing machine - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an end control sewing machine, and more particularly, to an end control sewing machine for a sewing product that enables three-dimensional sewing.
[0002]
[Prior art]
An end control device that performs sewing along the end of the sewing product by feeding the sewing product in one direction by the cloth feeding means and laterally feeding the sewing product while aligning the end of the sewing product by the lateral feeding means. Conventional sewing machines are known.
For example, as shown in FIG. 5 (a), a cloth edge detecting means 7c that is arranged on the cloth feeding side from the needle dropping point 1a and detects the cloth edge position of the work cloth 2c transferred to the needle dropping point 1a; A direction (arrow) that has a holding member 24 that can hold the work cloth 2c and a support member that movably supports the holding member 24 as the work cloth 2c is fed and that is substantially orthogonal to the cloth feed direction (arrow B). The work cloth operating means movable along the reference C) and the work cloth operation means so that the cloth edge of the work cloth is at a predetermined position with respect to the needle drop point 1a based on the detection result of the cloth edge detecting means 7c. A sewing machine cloth edge control device comprising a control means for controlling the sewing machine is disclosed (Japanese Patent Laid-Open No. 6-86884).
In this cloth edge control device, the nipping member 24 is a roller capable of nipping a work cloth and movable in accordance with cloth feeding, so that the cloth feeding direction has less resistance and the direction perpendicular to the cloth feeding direction is nipped. The work cloth can be moved by the frictional force of the member 24.
[0003]
[Problems to be solved by the invention]
However, when the work cloth is held by the holding member, even if the resistance in the cloth feeding direction is reduced by adopting the movable roller, the rolling friction coefficient of the movable roller is not 0, so that the work cloth is always tensioned. It becomes a state. In particular, in a woven fabric having a step, a soft processed fabric, a nonwoven fabric, a foam, or the like, a slight tension may cause a seam line or a stitch pitch error. Further, there is a problem that a slight change in tension affects the dyeing agent, the weaving method, and the weaving direction of the sewing product, and so-called burrs are generated.
Further, in the case of a movable roller, the movement in the direction orthogonal to the cloth feeding direction is performed by the linear frictional force of the roller, so that there is a problem that wrinkles are likely to occur on the work cloth. That is, as shown in FIG. 5 (b), the lower region 25 in the drawing is expanded and the upper region 26 is contracted around the needle drop point 1a of the sewing needle, so that wrinkles are likely to occur.
Furthermore, in the case of a movable roller, the entire mechanism is complicated and the diameter of the movable roller has to be taken to some extent. Therefore, there is a problem that the movable roller cannot be arranged near the needle drop point, and the above wrinkles are more generated. It becomes easy to do.
[0004]
On the other hand, when the upper cloth and the lower cloth have different radii of curvature using the conventional cloth edge control device, for example, the upper cloth has an outer curve and the lower cloth has an inner curve. If the end of the article is aligned and sewn, the sewing product will have a three-dimensional shape. There is a problem that control becomes difficult.
[0005]
The present invention has been made to cope with such a problem, and even if it is a curved end portion or has different curvature radii, it can be sewn with a constant seam allowance. It is an object of the present invention to provide a sewing machine end control sewing machine.
[0006]
[Means for Solving the Problems]
The end control sewing machine capable of three-dimensional sewing according to the present invention includes a conveying means that intermittently conveys the workpiece in synchronization with the raising and lowering operation of the sewing needle, and the conveyance when the conveyance of the sewing workpiece is stopped. When the sewing product is moved in a direction substantially orthogonal to the direction, and the sewing product is conveyed in the conveying direction, the upper and lower sides of the superimposed sewing products that are not in contact with the sewing product Lateral feed means using upper and lower claws arranged on the side of the machine, and the transport means and the lateral feed means are controlled in conjunction with the rotation angle of the upper shaft of the sewing machine, The movement of the sewing product in a direction substantially orthogonal to the direction is performed using a sewing needle stuck in the sewing product as a fulcrum. In the present invention, the material to be sewn refers to a material that can be sewn at its end, such as a woven fabric, a nonwoven fabric, a film, and a foamed material.
[0007]
Further, a sewing product end detecting means for detecting the end position of the conveyed sewing product is arranged on the sewing product feeding side from the drop point of the sewing needle, and based on the detection result of the detecting means, The amount of movement in the orthogonal direction is controlled.
[0008]
Further, the above-mentioned sewing object end detection means and the lateral feed means are arranged on the upper and lower sides of the two overlapped sewing objects, and the movement amount in the substantially orthogonal direction is determined based on the respective end detection results. It is characterized by being controlled independently.
[0009]
The present invention is non-contact when transporting the sewing product, and moves the sewing product in a direction substantially perpendicular to the transport direction when the transport is stopped, so that tension is not applied when the sewing product is transported. The end can be controlled. Therefore, even if it is a soft cloth or a to-be-sewn product with a level | step difference, it can sew with a fixed seam allowance.
Further, since the amount of movement in the substantially orthogonal direction is controlled based on the detection result of the sewing product edge detection means, no problems occur even if the sewing product has complicated curved edges. Furthermore, since the amount of movement in the substantially orthogonal direction is controlled independently up and down, even when sewing an object having an outer curve and an inner curve at the same time, the end portions can be aligned and sewn together, and three-dimensional sewing can be performed. Easy to do.
[0010]
DETAILED DESCRIPTION OF THE INVENTION
The end control sewing machine of the present invention will be described with reference to FIG. FIG. 1 is a diagram for explaining the operating state of the present invention.
In FIG. 1, reference numeral 1 denotes a sewing needle for sewing the articles to be sewn 2a and 2b, and performs an up and down movement. 2 is a sewing product, 2a is an upper sewing product, and 2b is a lower sewing product. Reference numeral 3 denotes a sewing material presser member, which is pivotally attached to the lower end of a presser bar 3a held on the sewing machine arm so as to be movable up and down, and is urged downward together with the presser bar 3a by a spring. Reference numeral 4 denotes conveying means for conveying the sewing products 2a and 2b in the direction of arrow A, for example, a feed dog that performs four known movements. Reference numeral 5 denotes a stopper that is arranged in parallel with the direction of conveyance of the sewing product and sets a predetermined seam allowance.
Reference numerals 6a and 6b denote lateral feed means for moving the sewing product in a direction substantially orthogonal to the direction of conveyance of the sewing product. Move independently up and down in the direction. 7a and 7b are detection means for detecting the end of the sewing product, 8 is a partition plate for the sewing products 2a and 2b, and 9 is a regulating member for introducing the sewing product to the sewing needle position.
Hereinafter, in the present invention, a pair that is disposed or introduced above the partition plate 8 is represented by an auxiliary code a, and a lower one is represented by an auxiliary code b, and the whole is represented without an auxiliary code. .
In the present invention, since the lateral feed means 6 is a locking means such as a claw, it is easy to reduce the size. Therefore, the transverse feed means 6 may be arranged after the detection means 7 with respect to the conveyance direction of the sewing product.
[0011]
The workpiece 2 whose end is to be sewn is intermittently conveyed in the direction of the arrow A through the partition plate 8 and the restricting member 9 while being synchronized with the lifting and lowering operation of the sewing needle 1. While being conveyed in the direction of the arrow A, the lateral feed means 6 is in a non-contact state with the workpiece 2. That is, no stress is applied to the workpiece 2 except in the conveying direction.
Next, while not being conveyed in the direction of the arrow A, a claw or the like constituting the lateral feed means 6 is locked on the surface of the sewing product 2 so that the end of the sewing product 2 extends in a direction substantially perpendicular to the conveyance direction. Move to stopper 5. Thereby, the edge part of the to-be-sewn material 2 can be arrange | equalized.
The workpiece 2 is moved in a direction substantially orthogonal to the conveyance direction with the sewing needle 1 stuck in the workpiece 2 as a fulcrum.
[0012]
The conveyance means according to the present invention for intermittently conveying the sewing product in synchronism with the raising / lowering operation of the sewing needle performs four movements in synchronization with the raising / lowering operation of the sewing needle by the vertical movement mechanism and the horizontal feed mechanism. Any means having a feed dog 4 that can be used can be used. An example of the conveying means will be described with reference to FIG. FIG. 2 is a view for explaining the operating state of the feed dog 4.
In FIG. 2, reference numeral 10 denotes a feed dog base for fixing the feed dog 4. One end of the feed dog base 10 is connected via an eccentric cam 11 to constitute a vertical movement mechanism, and the other end is a horizontal feed arm body 12. A horizontal feed mechanism is constructed. The feed dog base 10 moves up and down by the rotational movement of the eccentric cam 11 interlocked with the upper shaft of the sewing machine (not shown). On the other hand, a horizontal feed arm body 12 pivotally supported at one end of the feed dog base 10 is fixed to a horizontal swing shaft 13 which performs a swing motion in conjunction with the upper shaft of the sewing machine at the other end. By transmitting the swing motion of the horizontal swing shaft 13 to the feed dog pedestal 10, the feed dog pedestal 10 moves horizontally.
The sewing product can be conveyed intermittently by the combination of the vertical movement and the horizontal movement. In addition, the sewing needle can be moved up and down in synchronism with intermittent conveyance of the sewing product by known means for interlocking the upper shaft of the sewing machine (not shown) and the balance crank.
[0013]
The lateral feed means according to the present invention will be described with reference to FIG. FIG. 3 is a diagram for explaining the operating state of the lateral feed means.
In FIG. 3, reference numeral 6 denotes a lateral feed means for moving the sewing product in a direction substantially orthogonal to the conveying direction of the sewing product 2.
This transverse feed means 6 is the same mechanism when sewing two overlapped workpieces, except that the upper claw 14a and the lower claw 14b reverse each other in the vertical motion. 6a and 6b having the following movement mechanism are used in combination. A known reversing mechanism can be used for reversing the vertical movement. For example, the upper claw 14a and the lower claw 14b operate vertically symmetrically by setting the eccentric cam 17a and the eccentric cam 17b in opposite phases.
[0014]
Reference numeral 14a denotes an upper claw having a distal end portion 15a that is locked to a sewing product, and is fixed to the main body 16a. An eccentric cam 17a for moving the claw 14a up and down in the drawing and an arm body 18a for moving left and right are provided in the main body 16a.
The vertical movement of the claw 14a constituting the lateral feed means at the time of sewing is made by the main body 16a moving up and down by the rotational movement of the eccentric cam 17a interlocked with the upper shaft of the sewing machine (not shown).
On the other hand, the left and right movements of the claw 14a constituting the lateral feed means together with the vertical movement are fixed at the center to the swinging shaft 19a interlocked with the upper shaft of the sewing machine (not shown) and the other end to the sliding portion 23a of the main body 16a. This is performed by swinging movement of the arm body 18a having the sliding member 20a that is slidably held.
The left and right momentum is controlled by adjusting the amount of swing of the crankshaft 21a, with one end pivotally supported by the sliding member 20a and the other end pivotally supported by the crankshaft 21a. That is, the sliding member 20a moves up and down at the sliding portion 23a of the main body 16a by adjusting the amount of rotation of the rotating shaft 22a that fixes the crankshaft 21a. As a result, the left and right momentum can be changed by changing the swing amount of the sliding member 20a. When the sliding member 20a is positioned above or below the swinging shaft 19a, the sewing product is pulled up to the stopper 5 and the sewing product that has entered too far is pulled away from the stopper 5. Can be realized.
[0015]
In the case of two-layer sewing, it is preferable to use a partition plate 8 that separates the upper sewing product 2a and the lower sewing product 2b together with the lateral feed means. The upper sewing product 2a and the lower sewing product 2b having different radii can be easily sewn while aligning the respective end portions.
[0016]
In addition, the upper end detection means 7a and the upper claw 14a arranged above and below the partition plate 8 and the lower end detection means 7b and the lower claw 14b are interlocked to control the right and left momentum of the claw 14. As the end detection means 7a and 7b, all sensors, for example, a laser displacement sensor, a contact switch, and the like can be used, and these outputs are input to a servo motor to rotate the rotating shaft 22.
The momentum can be taken in two cases: the case where the sewing product is pulled to the stopper 5 and the direction in which the sewing material which has entered too much is pulled away from the stopper 5.
[0017]
The upper claw 14a and the lower claw 14b are as follows. When the workpiece is conveyed by the feed dog 4, the upper claw 14a moves upward in FIG. 1, and the lower claw 14b moves downward in FIG. Thus, the upper claw tip 15a and the lower claw tip 15b are not in contact with the sewing products 2a and 2b.
In the sewing process, 1) the raising and lowering operation of the sewing needle, 2) the transfer of the sewing product, 3) the upper claw tip 15a and the lower claw tip 15b for moving the sewing product in a direction substantially perpendicular to the transfer direction The meshing motion (vertical motion) and the pull-in motion (left-right motion) for aligning the end with the stopper 5 are synchronized with the upper shaft of the sewing machine in synchronization with each other. A vertical feed mechanism or the like can be used.
[0018]
FIG. 4 shows an example of the synchronous movement of each part such as the raising / lowering operation of the sewing needle. FIG. 4 is a motion curve diagram representing each motion as a function of the upper shaft rotation angle. As for the tip of the nail, the upper nail is taken as an example.
As shown in FIG. 4, when the sewing needle is stuck in the workpiece, the tip of the nail is locked to the workpiece and only the lateral feed force is applied. When the sewing needle is being conveyed, the nail is sewn. The object is in a non-contact state.
Note that it is preferable to synchronize so that the lateral feed means works once when the upper shaft makes one revolution, because the mechanism becomes simple, but the lateral feed mechanism can be changed from a fraction of a time to one revolution of the upper shaft. It can also be synchronized to work several times.
[0019]
【The invention's effect】
The present invention has means for moving the sewing product in a direction that is non-contact when the sewing product is conveyed and is substantially perpendicular to the conveying direction when the conveyance is stopped. The end can be controlled without imposing a load on the object. Moreover, since a nail | claw etc. are used as a means to move a to-be-sewn item in the substantially orthogonal direction, since it becomes a small and simple shape, it can arrange | position in the vicinity of a sewing needle. As a result, even if it is a soft cloth, an end portion having a small radius of curvature, or an end portion having a step, it can be sewn with a constant seam allowance.
[0020]
Further, the sewing object end detection means is arranged on the sewing product feed side from the drop point of the sewing needle, and based on the detection result, the movement amount of the sewing product in the substantially orthogonal direction is controlled. Sewing can be performed with higher accuracy.
[0021]
In addition, since the amount of movement in the substantially orthogonal direction is controlled independently in the vertical direction, even when sewing the workpiece having the outer curve and the inner curve at the same time, it is possible to sew with a constant seam allowance, so that three-dimensional sewing is possible. Can be easily done.
[Brief description of the drawings]
FIG. 1 is a diagram illustrating an operation state of an end control sewing machine.
FIG. 2 is a diagram for explaining an operating state of a feed dog.
FIG. 3 is a diagram for explaining an operating state of a lateral feed mechanism.
FIG. 4 is a motion curve diagram showing the motion of each part as a function of the upper axis rotation angle.
FIG. 5 is a diagram for explaining a conventional sewing machine cloth edge control device;
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Sewing needle 2 Sewing thing 3 Sewing thing presser member 4 Conveyance means 5 Stopper 6 Lateral feed means 7 Detection means 8 Partition plate 9 Restriction member 10 Feeding tooth base 11 Eccentric cam 12 Horizontal feed arm body 13 Horizontal rocking shaft 14 Claw 15 Claw tip 16 Main body 17 Eccentric cam 18 Arm body 19 Oscillating shaft 20 Sliding member 21 Crank shaft 22 Rotating shaft 23 Sliding portion

Claims (4)

A conveying means for intermittently conveying the workpiece in synchronization with the raising and lowering operation of the sewing needle;
When the conveyance of the sewing object is stopped, the sewing object is moved in a direction substantially perpendicular to the conveying direction, and when the sewing object is conveyed in the conveying direction, the sewing object is moved to the sewing object. Non-contacting, comprising a cross-feed means using upper and lower nails arranged on the upper and lower sides of the superimposed sewing product,
The conveying means and the respective lateral feeding means are controlled in conjunction with the rotation angle of the upper shaft of the sewing machine, and the movement of the sewing product in a direction substantially perpendicular to the conveying direction is stuck in the sewing product. An end control sewing machine capable of three-dimensional sewing, characterized in that the sewing needle is used as a fulcrum. Sewing object end detecting means for detecting the end position of the conveyed workpiece to be conveyed is arranged closer to the sewing object feeding side than the drop point of the sewing needle, and based on the detection result of the detecting means, The end control sewing machine according to claim 1, wherein a movement amount in a direction perpendicular to the direction is controlled. The sewing product end detection means and the lateral feed means are arranged on the upper and lower sides of the two pieces of the overlapped sewing products, and the movement amount in the substantially orthogonal direction is determined based on the respective end detection results. The end control sewing machine according to claim 2, wherein the end control sewing machine is controlled independently. The end control sewing machine according to claim 1, 2 or 3, further comprising a partition plate for separating the upper sewing product and the lower sewing product together with the lateral feed means.

Images