JPH0138519B2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] This invention provides a method for selecting corner knives from among a plurality of pairs of corner knives.
This invention relates to an improvement in the operating mechanism of a corner knife in an automatic welt sewing machine in which a pair can be arbitrarily selected, and in particular, V-cuts are made sequentially at both opening ends of diagonal pockets of body fabrics fed alternately on the left and right sides. .

[Conventional technology and its problems]

Conventionally, pockets with beaded edges provided on both sides of a jacket have V-cuts at both ends of the pocket opening P, which opens at an angle of 90 degrees to the vertical line L on both sides, as shown in Figure 4. Most of the pockets were so-called right-angled pockets, but in recent years, with the diversification of designs, so-called diagonal pockets, which are inclined at a certain angle θ with respect to the vertical line L, have been widely adopted.

When opening such diagonal pockets, various corner knives that make different V-cuts can be selected depending on the inclination angle, and since the body fabric is fed to the sewing machine alternately on the left and right, It is necessary to switch the corner knives alternately.

The operating mechanism of a corner knife that opens such a diagonal pocket is, for example, a pair of rotary bodies made by inserting several types of corner knives, which can be rotated and separated by a certain amount via gears, and a desired angle can be achieved. A device in which the corner knives are placed at both ends of the pocket opening and raised appropriately to make a V-cut is already known (see Japanese Patent Publication No. 61-115), but due to its structure, it is necessary to separately lock the gear. The entire device was complicated, requiring a mechanism.

[Means for solving problems]

Therefore, in the present invention, one of the two movable plates installed oppositely below the sewing machine table can be moved back and forth a certain amount in the sewing direction, and both can be reciprocated by a certain amount in the direction perpendicular to the sewing direction by means of a large cylinder. An actuating plate supporting a plurality of pairs of corner knives facing each other is attached to the inside of each movable plate so as to be movable by one pitch using a small cylinder, and a rising cylinder provided below both of the movable plates is further mounted. Therefore, by making each pair of corner knives selectively movable up and down, the above-mentioned problems can be solved at once.

[Effect]

The present invention has the effect of quickly V-cutting both ends of a pocket opening by arbitrarily selecting a pair of corner knives from among several types of corner knives.

〔Example〕

Hereinafter, the structure of the present invention will be described in more detail based on the embodiment shown in the drawings. Reference numeral 1 denotes a clamp for holding down the body fabric on the sewing machine table T, a servo motor (not shown), a rotating shaft 2, etc. It is connected to a drive base 3 which is operated by a motor, and is capable of reciprocating over the table T by a certain amount.

Further, 4 and 4' are large cylinders installed below the table T horizontally and perpendicularly to the sewing direction through fixing plates 5 and 5', and 6 and 6' are the large cylinders of each of the cylinders 4 and 4'. They are movable plates fixed oppositely to each other at the tips thereof, and can reciprocate a certain distance along the guide rods 7 and 7', and one of the movable plates 6' is connected to a horizontal rod connected to the drive base 3. 8
This allows movement in the sewing direction by a distance commensurate with the opening width of the pocket.

Further, 9 and 9' are fixed to small cylinders 10 and 10' attached near the bases of the movable plates 6 and 6', and are capable of reciprocating one pitch at a time.
Reference numerals 1 and 11' denote a plurality of pairs of corner knives attached to the respective actuating plates 9 and 9'. Square column-shaped slide shafts 12 and 12' extending from the lower ends of the respective knives are connected to the actuating plates 9 and 9'. The corner knife 11,
11' can be projected onto the table T.

In addition, each of the above-mentioned large and small cylinders 4, 4', 110,
10' shows a pair, but by making appropriate parts of each pair of movable plates 6, 6' and actuating plates 9, 9' fixed to this pair connectable when approaching,
One cylinder 4, 10 connects various corner knives 11, 11' to the center line (sewing line) CL.
, and select the desired female.

Now, as shown in FIG. 3, the corner knives 11 and 11' are arranged sequentially from the center line CL side to the left side pockets 11a and 11'a, which are inclined at an angle of 80 degrees to the vertical line L. For right side 1
1b, 11'b, right-angled pocket for both left and right use 11
c, 11'c, and 11d, 11'd for the left side of the diagonal pocket with an inclination angle of 74 degrees, and 11e, 1 for the right side.
1'e each pair of female cylinders 10,
10' and are placed opposite each other with a distance of one pitch.

Therefore, when using the above corner knife to make a V-cut at both ends of the opening of the 80° left and right diagonal pockets, first set the left body fabric and ball fabric in the specified positions on the table T, and then tighten the clamp 1. At the same time, a straight pocket opening is cut using a center scalpel (not shown).
After that, moving the body fabric above the corner knife is still the same as before, but one corner knife 1 on the center line CL is moved.
1'a is guided by the horizontal rod 8 together with the actuating plate 9' and the moving plate 6', and is located precisely at both ends of the pocket opening.

At this time, a limit switch (not shown) is activated, and the corner knives 11a and 11'a pushed up by the respective rising cylinders 14 and 14' pass through both ends of the pocket opening to accurately make the V-cut. During this time, the right side body fabric and ball fabric are placed on the knife according to the above procedure, and at the same time, the small cylinders 10, 10' are extended by one pitch, and the corner knife 11b, which was set in advance, is 11'b to the center line CL, the lower end of each slide shaft 12, 12' engages with the lifting cylinder 14, 14', and the corner knife 11
b and 11'b perform V-cutting according to the motion described above.

When V-cutting both opening ends of a right-angled pocket, extend the large cylinders 4, 4' until the tips of the movable plates 6, 6' contact the stopper 15, and move the corner knives 11c, 11'c to the center line CL.
By positioning it, you can make a V-cut regardless of the left or right side of the body fabric.

Furthermore, when V-cutting both ends of the pocket opening that is inclined at another angle, for example, 74 degrees, rotate the lever 15b supported on the spindle 15a of the stopper 15 to remove it, and then remove the large cylinder 4. ，
4' to the maximum extent, moving the movable plates 6, 6' further forward, and moving the corner knives 11d, 11'd onto the center line CL, left and right switching can be done using the small cylinders 10, 6' as described above. 10'.

Although the corner knives 11 and 11' are shown as having three types of left and right knife blades set in advance, the number is not particularly limited, and the number of knife blades other than those set on the actuating plates 9 and 9' is not limited to any particular number. If a corner knife is required, it can be constructed so that it can be replaced from an appropriate part of the knife.

〔Effect of the invention〕

As described above, according to the operating mechanism of the corner knife in the automatic welt sewing machine of the present invention, not only can various corner knives be easily selected as needed, but also the cylinder that moves back and forth for each pitch can be easily selected.
10, 10' left and right corner knife 11,
11' are arranged alternately on the center line, so it is possible to quickly and accurately V-cut both sides of the opening of the diagonal pocket of the body fabric that is supplied alternately on the left and right sides. As such, there are many excellent effects, such as eliminating the need for a separate locking mechanism and further improving production efficiency.

[Brief explanation of drawings]

Fig. 1 is a partially cutaway front view of the welt sewing machine of the present invention, Fig. 2 is an enlarged view of its main parts, Fig. 3 is a plan view thereof, and Fig. 4 is a plan view of various pocket openings. It is a diagram. In the figure, 4, 4'... large cylinder, 5, 5'...
... Fixed plate, 6, 6'... Moving plate, 7, 7'... Guide rod, 8... Horizontal rod, 9, 9'... Operating plate,
10,10'...Small cylinder, 11,11'...
Corner knife, 12, 12'...Slide shaft, 1
3, 13'...Guide, 14, 14'...Rising cylinder.

Claims (1)

[Claims] 1 One of the two movable plates 6 and 6' installed oppositely below the sewing machine table T moves back and forth a certain amount in the sewing direction, and both move back and forth a certain amount in the direction perpendicular to the sewing direction by the large cylinders 4 and 4'. On the other hand, the actuating plates 9, 9', which support a plurality of pairs of corner knives 11, 11' facing each other on the inside of each movable plate, can be moved one pitch by the small cylinders 10, 10'. Attach it to the cylinder 14/14'
An operating mechanism for a corner knife in an automatic welt sewing machine, characterized in that each pair of corner knives can be selectively raised and lowered by the following.