JP2017176306A - Device for cutting tape-shaped object for sewing machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a cutting device which is arranged upstream from a sewing part of a sewing machine in a cloth feed direction, and cuts a tape-shaped object to a desired cut width by a pair of knife mechanisms mounted at a desired distance from each other in a direction orthogonal to the cloth feed direction, and in which, by dial operation, the adjustment of the knife positions of the left and right knife mechanisms can be simultaneously and accurately performed, and the adjustment of the desired cut width can be simply performed in a short time.SOLUTION: A screw shaft 22 integrated with a dial 21 includes a right-handed screw and a left-handed screw threaded in an outer periphery and an inner periphery, and is axially supported in an only rotatable manner. One of a pair of lower knife mounts 12 and 16 mounted with lower knives 11 and 15 includes a hollow shaft part 17 having a screw threaded in an inner periphery, and is screwed to the outer peripheral side of the screw shaft 22, and the other thereof is passed through the hollow shaft part 17 to be screwed to the inner peripheral side of the screw shaft 22. The screws are all formed so as to have the same lead. The turning operation of the dial allows both of the lower knife mounts 12 and 16 to simultaneously approach each other or separate from each other by the same amount.SELECTED DRAWING: Figure 7

Description

  The present invention is a set of tape-like objects, for example, a set of cloths arranged in front of the cloth feed direction of the sewing part of a sewing machine for producing a belt loop for passing a belt through the waist part of trousers and incorporated in a direction perpendicular to the cloth feed. The present invention relates to a cutting device that cuts a tape-like object with a desired cutting width by a knife mechanism.

  When using a sewing machine to make a tape loop, for example, a belt loop that is sewn to the waist of a trouser, the belt loop tape is centered on the needle bar by a cutting device placed on the front side of the sewing section in the cloth feed direction. After cutting and aligning with the same amount of cut width on both sides of the sewing center line extending in the cloth feed direction, it passes through the folding guide and feeds the left and right side edges of the tape-like object downward to the stitching part, Sewing both the left and right ends of the tape-like object in the cloth feeding direction with a needle is performed.

  As the cutting device, with the sewing center line sandwiched between them, they are arranged at equal intervals on both sides and are fixed to the left and right sides of the lower knife mounting base and pressed against the outer surfaces of the lower knife, respectively. A device that cuts the right and left side edges of the tape-like material with an equal cut width from the sewing center line by a knife mechanism assembled symmetrically on both sides of the sewing center line. This device is provided with an adjusting mechanism for adjusting the left and right positions in the direction orthogonal to the cloth feed of each knife mechanism, so that the cutting width of the tape-like object can be adjusted.

  Specifically, the adjustment of the cutting width in the device is performed by loosening the set screw for fixing the shaft guide of the lower knife mounting base to which the lower knife is attached during the construction of the knife mechanism, and loosening the lower knife mounting base. After adjusting the position with the lower knife in the left and right direction, loosen the set screw on the upper knife mounting base that is fixed to the swing shaft that is driven to swing in conjunction with the internal mechanism of the sewing machine, and the upper knife is attached. The upper knife mount is moved along the swing axis along with the upper knife and moved left and right to press the upper knife against the lower knife. This work is performed by the knife mechanism on the left and right sides of the sewing center line. It was done individually so as to be symmetrical. Conventionally, the knife position is adjusted individually by performing trial sewing and repeating trial and error every time the adjustment is performed, or by using the scale marked on the needle plate as a guide. As another method of adjusting the knife position, adjust the lower knife position while applying a ruler etc. to the lower knife from above and reading the scale of the ruler, etc. After adjusting the lower knife position, push the upper knife to the lower knife. There is also a method to adjust the position of the lower knife, but to adjust the position of the lower knife, apply a ruler to the lower knife with one hand and adjust the position of the lower knife while reading the scale of the ruler. In addition, it is cumbersome and not easy to perform the setting operation of the set screw with the other hand, and to perform this operation individually with the left and right scalpels.

  In order to facilitate the above adjustment work, the following Patent Document 1 discloses that the lower knife base is fixed to the lower knife base on which the lower knife is fixed, and the lower knife base is attached to the bracket to which the lower knife base is attached. A cutting device has been proposed in which the position of the lower knife and the upper knife pressed against the lower knife is adjusted by moving the dial type operating screw screwed into the base in the left-right direction. Yes.

JP 2003-326046 A

  In the cutting apparatus disclosed in Patent Document 1, the cutting width of the lower knife and the knife mechanism of the upper knife pressed against the lower knife can be easily adjusted simply by rotating the dial screw. Sometimes, by reading the scale of the auxiliary plate and deciding the position of the lower knife base, the adjusted cutting width can be correctly distributed on both sides of the sewing center line, as in the past. In order to check whether the cut width after adjustment is equally distributed on both sides of the center line, the position of the lower knife base is adjusted little by little, and the troublesome work of performing trial sewing for each adjustment becomes unnecessary. In this cutting apparatus, the left and right knife positions are calibrated on the auxiliary plate, while the desired cutting width adjustment can be performed easily and efficiently without taking time and extra time. It had to be individually adjusted to suit.

  SUMMARY OF THE INVENTION An object of the present invention is to provide a cutting apparatus in which adjustment of the knife positions of the left and right knife mechanisms can be accurately performed simultaneously by dial operation, thereby enabling desired cutting width adjustment to be performed easily and in a short time. To do.

  According to the first aspect of the present invention, a pair of left and right lower knife mounts provided with a lower knife and an up-and-down drive in a state of being pressed against the lower knife, and a tape-like object in the longitudinal direction in cooperation with the lower knife. A knife mechanism consisting of an upper knife that cuts along the center of the needle bar, and the knife mechanism is distributed at equal widths on both sides across a sewing center line that extends in the cloth feed direction through the center of the needle bar. A cutting device for a tape-like material for sewing machine arranged on the front side in the cloth feeding direction of a stitching portion including a needle attached to a needle stock of a rod, and having a dial and a screw shaft that rotates by rotating the dial. The screw shaft includes a right screw and a left screw, and both screws have the same lead, and a screw portion provided on one of the left and right lower knife mounts is screwed to the right screw. Width adjustment by which the screw part provided on the other mounting base is screwed to the left screw Characterized in that a location.

  The invention according to claim 2 is the invention according to claim 1, wherein the screw shaft is a hollow shaft, and a right screw is engraved on one of the inner peripheral surface and the outer peripheral surface, and a left screw is engraved on the other. It is characterized by that.

  The invention according to claim 3 is characterized in that, in the invention according to claim 1, the screw shaft is engraved with a right screw on one side and a left screw on the other side.

  The invention according to claim 4 is the invention according to any one of claims 1 to 3, wherein a scale for reading the position of the lower knife or the lower knife mounting base is attached to both sides of the sewing center line, and The left and right lower knife mounting bases are slidably engaged in the left and right directions, respectively, and a scale plate for stopping rotation of each lower knife mounting base is provided.

  According to the present invention, when the dial is rotated, the lower knife is attached to the lower knife mounting base disposed on both sides of the sewing center line, and the upper knife is pressed against the lower knife. Both the female mechanisms move in the direction of approaching one lead of the screw for each rotation of the dial, or in the opposite direction, so that both the left and right female mechanisms are of equal width from the center line. Simultaneously and accurately separating or approaching, so that the desired cutting width can be adjusted simultaneously on both sides of the center line easily and in a short time without separately adjusting the knife positions of the left and right knife mechanisms. become.

  If the scale plate as described in claim 4 is provided, the adjusted position of the lower knife or the lower knife mounting base can be read, and the position adjustment of the lower knife mounting base can be performed when the dial is rotated. It is possible to prevent the lower knife mounting base from rotating with the screw shaft without hindering.

The perspective view which shows the whole flat sewing machine with which the cutting device which concerns on this invention is attached. The perspective view which looked at the cutting device shown in FIG. 1 from the right side. The perspective view which looked at the same cutting device from the left side. The front view of the cutting device. The disassembled perspective view of the principal part structure of the cutting device. Sectional drawing in the AA of FIG. The fragmentary sectional front view which shows the principal part of the cutting width adjustment apparatus in a cutting device. Schematic of the principal part structure of a cutting device. Schematic of another aspect which shows the principal part of a cutting width adjustment apparatus.

  FIG. 1 shows an entire flat stitch sewing machine 1 which is an example of a sewing machine targeted by the present invention, and includes a looper mechanism (not shown) below a needle plate P and a direction perpendicular to the cloth feed on the needle stock of the needle bar. The two needles that are attached in parallel with each other and constitute the stitching part together with the looper and the like, and the folding guides on the front side of the presser foot and the stitching part in the cloth feeding direction (guides for weaving the left and right edges of the belt-like object downward) Both are not shown.

  In front of the cloth feed direction of the folding guide, further insert a tape-like material through the center of the needle bar (the center between the needles of the two needles) across the sewing center line extending in the cloth feed direction, and the sewing center line on both sides thereof. A cutting device C for cutting with an equal amount of cutting width is provided on the front surface of the bed B.

2 is a perspective view of the cutting device C viewed from the right side, FIG. 3 is a perspective view of the cutting device C viewed from the left side, FIG. 4 is a front view of the cutting device C, and FIG. 6 is an exploded perspective view of the cutting device C excluding A1 and A2, FIG. 6 is a cross-sectional view taken along the line AA in FIG. 4, and the cutting device C is a pair of scalpels including a right female mechanism S1 and a left female mechanism S2. A mechanism is provided at a symmetrical position across the sewing center line. Hereinafter, the cutting device C provided with these knife mechanisms S1 and S2 will be described in detail.
On the concave bracket 3 attached to the front surface of the bed B by the pedestal 2, the female mechanisms S1 and S2 constituted by the lower knife mechanism and the upper knife mechanism are assembled in parallel in the left-right direction perpendicular to the cloth feeding direction. is there.

  2 to 5, the lower knife mechanism constituting the knife mechanism S1 includes a lower right knife base 4 fixed to the bracket 3 with a set screw 6 and a lower right knife 11 as a set screw. A plate-like lower right knife mounting base 12 which is fastened in place, and a shaft portion 13 projecting laterally from the mounting base 12 slides and rotates in the left-right direction perpendicular to the cloth feed to the lower right female base 4 It is pivotally supported through.

  The lower knife mechanism constituting the knife mechanism S2 includes a lower left knife base 5 fixed to the bracket 3 with a set screw 7 and a plate-like lower left knife mounting base to which a lower left knife 15 is fixed with a set screw. A hollow shaft portion 17 that protrudes laterally from the mounting base 16 is pivotally supported by the lower right female base 5 so as to slide and rotate in the left-right direction. Then, as shown in FIG. 7, the shaft portion 13 of the mounting base 12 passes through the fitting insertion hole 18 opened in the lower left female mounting base 16 and protrudes into the hollow shaft portion 17, and the tip portion is connected to the screw portion 13a. It has become. The hollow shaft portion 17 has an inner diameter larger than the outer diameter of the shaft portion 13, and a screw is engraved on the inner peripheral surface to form a screw portion 17a.

  The shaft portion 13 and the hollow shaft portion 17 provided with the screw portion constitute a cut width adjusting device D (see FIG. 7) together with the dial 21 and the screw shaft 22 which is integrated with the dial 21 and forms the dial shaft. The screw shaft 22 is hollow, and screws are formed on the outer peripheral surface and the inner peripheral surface, and the hollow shaft portion 17 of the lower left female mounting base 16 is screwed into the outer peripheral side screw from the outside. At the same time, the screw portion 13a of the shaft portion 13 of the lower right female mount 12 passed through the hollow shaft portion 17 is screwed into the screw on the inner peripheral side of the screw shaft 22 from the inside. (See FIG. 7). The screw shaft 22 is constrained to move in the axial direction by fitting and locking the U-shaped groove 25 of the L-shaped bracket 24 fixed to the lower left female base 5 in the circumferential groove 23 near the dial 21. Only supported by possible.

  One of the screws engraved on the outer periphery and inner periphery of the screw shaft 22 of the dial 21 is a right-hand screw and the other is a left-hand screw. These two screws are included, including the screw portion 17a on the inner periphery of the hollow shaft portion 17 and the tip of the shaft portion. Each of the screws of the screw portion 13a has the same lead. When the dial 21 is rotated, each time the dial 21 is rotated, the lower right knife mounting base 12 and the lower left knife mounting base 16 have one lead. It moves in a direction perpendicular to the cloth feed so as to approach or move away from each other by 1 mm. Therefore, the lower right knife mounting base 12 and the lower left knife mounting base 16 both have a sewing center line extending in the cloth feeding direction through the center between the two needles, which is the center of the needle bar, and on both sides of the sewing center line, etc. The screw portion 13a of the shaft portion 13 of the lower right female mount 12 is screwed into the screw shaft 22 of the dial 21 from the inside so that the position of the lower right female mount 12 is positioned, and the hollow shaft portion 17 of the lower left female mount 15 is If it is screwed to the outside of the shaft 22, the lower right knife 11 fixed to the lower right knife mounting base 12 and the lower left knife 15 fixed to the lower left knife mounting base 16 are simultaneously installed by rotating the dial 21. It moves so as to accurately approach or move away from both sides of the stitching center line by an equal amount.

  On the lower left knife base 5, one side of a scale plate 26 is fitted and screwed into a concave groove 25 on the front side in front of the cloth feeding direction, and the front end step portion 27 of the lower right knife mounting base 12 and the front end of the lower left knife mounting base 16 are fixed. The two female mounts 12 and 16 are prevented from rotating by engaging with the step portion 28 so as not to cause rotation when the dial 21 is operated (see FIG. 6).

Next, the upper knife mechanisms A1 and A2 constituting the knife mechanisms S1 and S2 together with the lower knife mechanism will be described in detail.
Further, a swing shaft 9 is installed in the bracket 3 in the left-right direction orthogonal to the cloth feed, and is supported so as to swing and slide in the axial direction. The upper right knife mechanism A1 of the knife mechanism S1 has one end. The hook portion 31 has a hook portion 31 fixed to the swing shaft 9. The hook portion 31 has a right upper knife 32 fixed to the upper portion of the other end, and a pin 33 protruding in a direction perpendicular to the cloth feed at the lower portion. ing. A piece 35 at one end of a link 34 connected to an internal mechanism (not shown) of the sewing machine is slidably inserted into the pin 33.

  In the upper right knife mechanism A1 configured as described above, the hook portion 31 swings up and down around the swing shaft 9 in conjunction with the internal mechanism of the sewing machine, and the upper right knife 32 is driven to move up and down. Yes.

  The upper left knife mechanism A2 of the knife mechanism S2 has a hook portion 37 that is supported at one end so as to be slidable and rotatable on the swing shaft 9, and, like the hook portion 31, an upper left knife 38 is provided at the upper end of the other end. It is fastened. Below the swing shaft 9, the hook portion 37 is connected by the hook portion 31 and the rod 39, and the hook portion 31 swings up and down with the swing shaft 9 as a fulcrum, like the hook portion 31, via the rod 39. To swing.

  Further, a nut 41 as shown in FIG. 8 is screwed and attached to the rocking shaft 9 at a thread portion formed in a required portion, and between the nut 41 and the hook portion 37 of the upper left female mechanism A2. A compression spring 42 is attached to the rocking shaft 9 and acts so as to increase the distance between the nut 41 and the hook portion 37, whereby the hook portion 37 is pushed in the direction of the right arrow in FIG. The upper left knife 38 is moved and pressed against the lower left knife 15 from the left side, while the nut 41 is pushed and moved in the direction of the left arrow in the figure along with the swing shaft 9, and the hook portion 31 fixed to the swing shaft 9 is illustrated. The right upper knife 32 at the tip of the hook is pressed against the lower right knife 11 from the right side.

  Adjustment of the knife positions of the knife mechanisms S1 and S2 is achieved by loosening the nut 41 and releasing the compression spring 42, freeing the hook parts 31 and 37 of the upper knife mechanisms A1 and A2, and allowing them to move left and right. After that, the dial 21 is rotated.

  By rotating the dial 21, the lower right knife 11 and the lower left knife 15 move so as to be close to each other or away from each other as described above, but the upper right knife 32 and the upper left knife 38 are respectively moved to the lower right by the action of the compression spring 42. Following the displacement of the knife 11 and the lower left knife 15 in the left-right direction, the knife 11 is displaced while pressed against the lower knife 11, 15 and cooperates with each of the lower knife 11, 15 at the adjustment position. Perform cutting work.

  The cutting device C of the present embodiment is configured as described above, and the tape-like material supplied to the cutting device C is sent to the folding guide while being cut at equal set widths on both sides of the sewing center line. After the left and right side edges are folded downward, the left and right edges are sent to the stitched portion, and the both side edges are stitched.

  In the cutting device of the above embodiment, the screw shaft 22 is formed integrally with the dial 21, but a transmission mechanism is provided between the dial 21 and the screw shaft 22, and the dial 21 is rotated via the transmission mechanism. The screw shaft 22 may be rotated. Thereby, the dial 21 can be provided at a position where the operator can easily operate.

  As a mechanism for moving the lower knife 11 and 15 away or close, a mechanism different from the above may be employed.

  FIG. 9 shows an example thereof. The screw shaft 45 of the dial shaft which is integrated with the dial 44 and is rotated by the dial 44 has a right screw 46 and a left screw 47 sandwiching the center line o between the left and right sides. The screw portion 48a provided on the lower right knife mounting base 48 to which the lower right knife is attached is screwed to the right screw 46, while the lower left knife is attached to the left screw 47. A screw portion 49a provided on the base 49 is screwed.

  In this embodiment, when the screw shaft 45 is assembled so that the center line o coincides with the above-described sewing center line, the left and right lower knife mounting bases 48 provided with the screw portions 48a and 49a by rotating the dial 44, Similarly to the above-described embodiment, 49 moves toward and away from each other by equal amounts on both sides of the sewing center line.

  In the above-described embodiment, the example in which the cutting device C is attached to the flat stitch sewing machine with two needles has been shown. However, the flat stitch sewing machine other than the two needles, the main sewing machine other than the flat stitch sewing machine, the double chain stitch sewing machine, etc. Can be installed in the same way.

  Although the cutting device in which the left and right knife positions can be adjusted has been described in the above embodiment, the same mechanism is used for the left and right positions of the tape guide for a guide mechanism including a tape guide that guides the left and right of the tape-like object. It is also possible to make adjustments according to the tape width.

3 .. Bracket 4, 5.. Female base 9 .. swing shaft 11, 15 .. lower knife 12, 16 .. lower knife mounting base 13 .. shaft portion 13 a .. shaft tip (screw portion)
··· Hollow shaft portion 21 · · Dial 22, 45 · · Screw shaft 24 · · L-shaped bracket 26 · · Scale plate 31 and 37 · · Hook portion 32 and 38 · · Upper knife 39 · · Rod 41 · · · Nut 42 ··· Compression spring 46 · · Right screw 47 · · Left screw 48a, 49a · · Screw part A1, A2 · · Female mechanism B · · Bed C · · Cutting device D · · Cut width adjustment device

Claims (4)

  From a pair of left and right lower knife mountings provided with a lower knife, and an upper knife which is driven up and down while being pressed against the lower knife and cuts a tape-like object along its longitudinal direction in cooperation with the lower knife A needle mechanism attached to the needle stock of the needle bar, the knife mechanism being distributed with equal width on both sides across a sewing center line extending in the cloth feed direction through the center of the needle bar. A cutting device for a tape-like material for sewing machine disposed on the front side in the cloth feeding direction of a stitching portion including a dial and a screw shaft that rotates by rotating the dial, and the screw shaft is a right-hand screw The left screw has the same lead, and the right screw is screwed with the screw provided on one of the left and right lower knife mounts, and the other screw is attached to the left screw. A cut width adjusting device is provided to which the screw part provided on the base is screwed. Cutting device to be.   The cutting apparatus according to claim 1, wherein the screw shaft is a hollow shaft, and a right screw is engraved on one of the inner peripheral surface and the outer peripheral surface, and a left screw is engraved on the other.   The cutting apparatus according to claim 1, wherein the screw shaft has a right-hand thread on one side and a left-hand thread on the other side.   A scale for reading the position of the lower knife or the lower knife mounting base is attached to both sides of the sewing center line, and the left and right lower knife mounting bases are slidably engaged in the left and right directions, respectively. The cutting apparatus according to any one of claims 1 to 3, further comprising a scale plate for stopping rotation of the lower knife mounting base.