JPH03170191A - Arm attaching/detaching mechanism for bead sewing machine - Google Patents

Abstract

PURPOSE:To attach/detach an arm by one action and to make the exchange of the arm convenient by inserting the rod of the arm to the holder part of a frame, which is fixed on the table of a sewing machine, and providing a lock means to be engaged with a lock groove on the outer periphery of the rod. CONSTITUTION:When a bead is sewn like the pocket of a jacket, a hollow rod 4 of an arm 1 for flap is inserted to a holder part 7 of a frame 6. A click wheel 10 of a one-way mechanism goes over a lock groove 4a and arrives at the deep end of the holder part 7 while being rotated by a spring 9, and the both wheel and holder part are coupled so as not to be moved back and forth. In such a case, since a projecting part 4b of a rod base end is tightly fitted to a recessed part 7b of the frame, the arm 1 for flap is fixed horizontally to the frame 6 not so as to turn right and left. When the arm 1 for flap is mounted, a duct 3c of compressed air is communicated with a supply port 12 on the frame 6 side by a packing 11 on the outer periphery of the hollow rod 4 while maintaining air tightness.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention enables the arm of the presser foot, which has a different shape, to be freely replaced depending on the presence or absence of a flap for the pocket when sewing the bead edges of pockets of clothes, etc. The present invention relates to an arm attachment/detachment mechanism in a welt sewing machine.

[Conventional technology and its problems]

In a normal welt sewing machine, an arm (hereinafter referred to as "
The arm for flaps has a wider presser foot, and the arm for pockets without flaps such as slacks (hereinafter referred to as "arm for non-flap") has a wider presser foot. Because flap clamps and other parts are attached, if you try to use this to sew the hem of a pocket without a flap, such as slacks, it will be useless for inserting the jade fabric due to the presence of the above-mentioned parts. In addition, especially when sewing the welt edges of slacks where the darts are placed across the pockets, it is necessary to set the bead material while holding down the edge of the dart, so it is necessary to set the bead fabric with a wide presser foot. The arm made it difficult for the worker to hold the end of the dart, resulting in extremely poor work efficiency. Due to these circumstances, conventionally two dedicated machines were prepared, one for flaps and one for non-flaps, but this not only lowered the operating rate of the sewing machine, but also caused problems in equipment costs and installation space. A decline in efficiency was also inevitable.

In addition, for example, as illustrated in Fig. 3, a conventional sewing machine has a frame (A) fixed above the table, a presser foot (opening), a flap clamp (C), etc., and a flap arm (2). and the bolt (E) and nut (E)
Since the structure was such that it was fixed with A fatal drawback was that the replacement work required a great deal of effort, such as removing the arm and replacing the arm, adjusting the angle of the presser foot, and switching the air passage.

SUMMARY OF THE INVENTION An object of the present invention is to enable a flap arm and a non-flap arm to be replaced in one hem sewing machine in a single snap.

[Means to solve the problem]

In order to achieve the above object, the present invention provides an arm having a large presser foot on one end and a rod with a locking groove provided on the outer circumferential surface of the arm on the other end. A holder into which the rod of the arm can be freely inserted is formed at the tip of the frame to be fixed, and a locking means that engages with a locking groove of the rod is provided on one surface of the holder, so that the rod of the arm can be inserted into the holder. In addition, a means was used in which the frame tip and the rod base end were fitted in a concave-convex manner.

] In the present invention according to the above-mentioned technical means, the locking means provided on one side of the frame fixes the rod with the locking groove in the holder so that it does not move back and forth. Moreover, the concave-convex fitting between the base end of the rod and the distal end of the frame serves to prevent rotation of the rod and to set the presser foot horizontally.

Embodiment] Hereinafter, the structure of the present invention will be described in more detail according to an embodiment shown in the drawings. In FIGS. 1 and 2, 1 is a flap arm equipped with a presser foot 2, a flap clamp 3a, and a base 3b. The rod 4 has a protruding portion 4b formed at its proximal end and a hollow rod 4 having a plurality of locking grooves 4a formed on its outer peripheral surface. A compressed air flow path 3C for operating the flap clamp 38 and the like is formed. Also, 5 is the presser foot 2"
This is a non-flap arm in which a hollow rod 4'' having the same external shape as the rod 4 and the convex portion 4b described above is provided on the base end side.

On the other hand, 6 is a frame fixed above the table of the sewing machine, 7 is a part of a holder formed at one end (right end in the figure) of the frame, and each loft 4 and 4 of each arm 1 and 5 is Each has an inner cavity 7a into which a person can fit, and a recess 7b into which the protrusion 4b at the base end of each arm can fit. Further, reference numeral 8 is a lever pivotally supported in a storage portion 7c on one side of the frame 6, 9 and 9 are springs elastically loaded at the base end of the lever, and 10 is pivotally supported at the tip of the lever 8. - A ratchet wheel that can be engaged with the 4° locking groove 4a, and the rods 4 and 4
This is a one-way mechanism that rotates only in the insertion direction of ``, and is always biased toward the locking groove 4a by the spring 9.

In the figure, 7d is an opening communicating with the inner space 7a of the holder part 7, 11 is a puff king attached to the tip side of each rod 4, 4'', 12 is a compressed air supply port, and 13 is a flap clamp 38. The air motor for operation is shown.

Next, we will discuss how to use the present invention in the above example. First, when sewing a welt that requires a flap, such as a jacket's shading, the flap arm I is attached to the holder part 7 of the frame 6. When the hollow rod 4 is inserted, the ratchet wheel 10 of the one-way mechanism, which is pressed into the locking groove 4a by the spring 9 against the locking 'a4a' of the rod, rotates and climbs over the locking groove 4a to partially hold the holder. 7, and the two are joined without moving in the front-back direction. At this time, the convex portion 4b at the base end of the rod is tightly fitted into the concave portion 7b of the frame, so that the flap arm 1 is fixed horizontally to the frame 6 without rotating in the left-right direction. becomes. Further, when the arm I for the flask is inserted, the compressed air passage 3c can be airtightly communicated with the supply port 12 on the frame 6 side by the packing 11 on the outer periphery of the hollow rod 4.

On the other hand, when using a non-flap arm in place of the flap arm 1, close the main valve of compressed air and push the base end of the lever 80 against the spring 9.
Since the engagement between the ratchet wheel 10 at the other end and the locking groove 4b of the hollow rod is released, the arm 1 can be pulled out.
Rod 4 of arm 5 for non-flat soap in the same manner as above.
The arm can be set accurately just by inserting it into the frame.

In the present invention, the locking means for each arm is not limited to the lever 8 and ratchet wheel 10 described above, but any locking means that can be engaged and detached from the locking groove 4a on the outer periphery of the rod 4/4'' may be used. It does not limit its structure.

〔Effect of the invention〕

The present invention allows the rod of a desired arm to be inserted into a part of the holder of the frame fixed on the table of the sewing machine, and
Since the arm is provided with a locking means that engages with a locking groove on the outer periphery of the rod, the arm has a flange 4. It can be attached and detached from the arm in one click, making it very convenient to replace the arm. In addition, since a part of the holder of the frame and the base end of the rod of the arm have a concave-convex fit, the presser foot can be set accurately by inserting the arm as described above, without the need for separate horizontal adjustment, and the connected arm It does not cause any rotation or the like.

As described above, according to the present invention, the flap arm and the non-flap arm of one welt sewing machine can be selectively replaced with one touch and more accurately. This has the special advantage of being able to eliminate all of the various problems that were encountered in .

[Brief explanation of the drawing]

FIG. 1 is a perspective view showing an embodiment of the attaching/detaching mechanism according to the present invention, FIG. 2 is a partial sectional view showing the state in which the arm is inserted, and FIG. 3 is a perspective view showing a conventional example. In addition, in the figure 1...Flap arm, 2.2゜...Large presser foot, 4.4゛...Rod, 4a...Latching groove, 5.
・・Arm for non-flap, 6・・Frame, 7・・
・Part of the holder. that's all

Claims (1)

[Claims] 1. An arm is provided with a presser foot on one end and a rod with a locking groove provided on the outer circumference on the other end. A holder is formed into which the rod can be freely inserted, and a locking means that engages with a locking groove of the rod is provided on one surface of the holder, so that the rod of the arm can be inserted into and removed from the holder, and furthermore, the rod of the arm can be inserted into and removed from the holder. An attachment/detachment mechanism for an arm in a welt sewing machine, characterized in that a proximal end portion is fitted in a concave and convex manner.