JPH07313770A - Knife position adjusting device for sewing machine for eyelet button holing - Google Patents

Abstract

PURPOSE:To easily adjust the position of a lower knife with high accuracy. CONSTITUTION:A guide board 40 arranged on a fitting stand 38 so as to be horizontally turned through a pivot shaft 46 is fitted to a long groove 52, which is formed at a bed part 12, so as to be freely slid. The guide board 48 is fixed through two third fixing screws 54 into the long groove 52 so as to freely adjust its position. The guide board 48 and the fitting stand 38 are fixed through a second fixing screw 50 so as to freely adjust their positions. The fitting stand 38 is fixed at the bed part 12 by three first fixing screws 44 so as to freely adjust its position. A lower knife 28 is fixed through two fixers 40 onto the fitting stand 38 so as to freely adjust its position.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an eyelet buttonhole sewing machine for forming a knife-shaped cut on a work cloth by a cutter device composed of a knife and a hammer having a required shape, and the position of the knife can be easily adjusted. The present invention relates to a knife position adjusting device for an eyelet buttonhole sewing machine that can be used.

[0002]

2. Description of the Related Art An eyelet buttonhole sewing machine for sewing eyelet holes formed in a work cloth in advance or afterward generally has the following basic structure. That is, the needle bar provided with the sewing needle at the lower end of the sewing machine frame has a needle bar vertically moved by the needle bar up-and-down driving mechanism, and the feed table on which the work cloth is set is set by the feeding device to the eyelet hole. A feed drive is provided along the cut shape. Also, the needle drop mechanism provided on the arm portion allows the needle drop point of the sewing needle to be swung right and left for each stitch. Along with the vertical movement and needle swing of the needle bar, the looper drive mechanism provided in the bed portion operates the looper, and the cooperation of the two allows overlock stitching along the eyelet hole.

The bed portion is provided with a cutter device composed of a lower knife and a hammer, whereby eyelet holes are cut into the work cloth at a required timing. That is, the lower knife on which the cutting blade including the straight portion and the circular portion is formed is positioned and fixed to the knife mounting position of the bed portion with the cutting blade facing upward via the mounting base. Further, the hammer is arranged so that it can be freely contacted and separated from the lower knife from above, and the hammer is driven by a driving means such as a cylinder at a required timing when the work cloth set on the feed table is faced between the lower knife and the hammer. When the work cloth is actuated, a cutting blade-shaped cut (eyelet hole) of the lower knife is formed on the work cloth.

[0004]

As the lower knife of the cutter device, a plurality of types having different length dimensions of the straight portion and the size of the circular portion of the cutting blade are prepared, one of which is a bed. It is designed to be replaceably fixed to the female attachment position of the section. That is, the user can change the shape of the eyelet holes formed in the work cloth by attaching the desired type of lower knife to the bed. On the other hand, the feed table on which the work cloth is set is given a feed drive along the cut shape of the eyelet hole formed by the selected lower knife. In this case, since the feed given to the feed table is set with respect to the machine reference, when replacing the lower knife, the lower knife is positioned and fixed in a correct posture with respect to the reference. However, if the lower knife is not positioned in the correct posture, the seam for the eyelet hole will not be formed accurately and the quality of the seam will deteriorate. For example, if a line extending in the front-rear direction of the feed table that passes through the center of the needle bar facing the reference position is used as a reference, it is necessary to position and fix the lower knife so that the straight portion of the lower knife is aligned with the reference line. .

Therefore, in the conventional cutter device, three mounting holes for fixing the lower knife to the bed portion are bored, and the screws inserted in the mounting holes are screwed into the screw holes formed in the bed portion. ing. With the three screws loosened, the operator moves the mount to adjust the straight part of the lower knife to the reference line, and then tightens the screws to position and fix them. ing. However, when the three screws are loosened, the mounting base can be moved in any of the front-rear, left-right, and circumferential directions, so it is not possible to make fine adjustments manually by the operator. It was a difficult and time-consuming task. That is,
For example, when the straight portion of the cutting blade of the lower knife is displaced in the left-right direction with respect to the reference line, the mounting base may be moved in parallel, but the mounting base can move in any direction. , It moves in the front-back direction and the circumferential direction when adjusting. Further, even when the straight part of the cutting blade is inclined at a required angle with respect to the reference line, a deviation in another direction occurs during the adjustment, and it is difficult to perform accurate positioning.

[0006]

SUMMARY OF THE INVENTION The present invention has been made in view of the drawbacks inherent in the position adjustment of a knife in the above-mentioned cutter device, and has been proposed in order to solve this problem preferably. The purpose is to provide a means that can be easily performed.

[0007]

SUMMARY OF THE INVENTION In order to overcome the above-mentioned problems and to achieve an intended object, the present invention is directed to a knife disposed on a bed through a mount so that the position of the knife can be adjusted, and an upper portion of the knife. Equipped with a cutter device consisting of a hammer that can be moved in and out of
In the eyelet buttonhole sewing machine that forms a knife-shaped cut in the work cloth by operating the hammer at a required timing with the work cloth facing between the knife and the hammer, the attachment is formed on the bed portion. A long groove extending in a direction intersecting with the straight portion of the knife disposed on the table, a guide member slidably fitted in the long groove and fixed in position in the long groove, and a mounting base for the guide member. It comprises a pivot for pivoting horizontally and a fixing means for positioning and fixing the mounting base on the guide member. The mounting base is positioned and fixed on the guide member, and the mounting base is extended in the extending direction of the long groove. It is characterized in that the position of the mounting base is adjusted in the circumferential direction around the pivot while the position of the mounting base is released from the guide member.

[0008]

In the cutter device of the eyelet buttonhole sewing machine, a guide member pivotally supported horizontally on a mounting base on which a knife is disposed via a pivot is slidably inserted into a long groove formed in the bed. Be done. Then, in a state where the mounting base and the guide member are positioned and fixed by the fixing means, the mounting base and the guide member are integrally moved along the long groove, so that the posture of the knife disposed on the mounting base is changed. The position can be adjusted in the extending direction of the long groove while being held. Further, when the guide member is positioned and fixed in the long groove and the mount is fixed to the guide member in a released state, the mount is rotated about the pivot shaft, and the position of the knife is adjusted only in the circumferential direction. To be done.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, a knife position adjusting device for eyelet buttonhole sewing machine according to the present invention will be described below with reference to the accompanying drawings with reference to preferred embodiments. (1) Overall structure of eyelet buttonhole sewing machine The eyelet buttonhole sewing machine in which the knife position adjusting device of the present application is implemented basically has the following structure. That is, in FIG. 2, the sewing machine frame 10 is composed of a bed portion 12 having a substantially rectangular box shape and an arm portion 14 extending forward and upward from the depth direction of the bed portion 12.
Is a sewing machine table 1 equipped with a sewing machine motor (not shown)
6 is placed on. A needle bar 20 having a sewing needle 18 at a lower end thereof is arranged on the front head portion of the arm portion 14 so as to be vertically movable and to be able to perform a left and right needle swing motion for each needle. The needle bar 20 is vertically driven by a needle bar vertical drive mechanism (not shown) arranged in the arm portion 14. The bed 12 has two loopers 2 located directly below the needle bar 20.
Two are provided. These loopers 22 are needle bars 2
It operates in synchronism with the vertical movement of 0 and the needle swinging motion, thereby forming a stitch on the work cloth 26 placed on the feed table 24 (described later) in cooperation with the sewing needle 18.

A work cloth 26 is provided on the upper surface of the bed portion 12.
Is provided with a cloth presser (not shown) that presses the work cloth 26 on both sides of a cut formed by a cutter device 32 described later. . The feed table 24 is in the form of a thin rectangular box as a whole, and is driven by a feed device equipped with two pulse motors (not shown) to be orthogonal to each other in the X direction.
It is movable in the left-right direction and in the Y direction (front-back direction). The movement pattern of the feed table 24 is set so as to follow the cutout shape of the eyelet holes formed in the work cloth 26, whereby the work cloth 26 placed on the feed table 24 is moved to a required position immediately below the sewing needle 18. Then, the cut edge of the eyelet hole can be sequentially stitched.

(2) Cutter Device The eyelet buttonhole sewing machine includes a lower knife 28 located on the depth side (rear side) of the looper 22 in the bed portion 12, and a hammer 30 that comes in contact with and separates from the lower knife 28 from above. A cutter device 32 consisting of is arranged. Then, a hammer 30 facing above the lower knife 28 positioned and fixed at the knife mounting position of the bed 12 via a knife position adjusting device described later.
Is lowered toward the lower knife 28 by the urging of a driving means such as a cylinder (not shown), so that the work cloth 26 facing between the lower knife 28 and the hammer 30 has an eyelet consisting of a round hole portion and a straight portion. The hole can be cut.

The lower knife 28 is shown in FIG. 1, FIG. 3 and FIG.
As shown in, a cutting blade 36 composed of a linear portion 36a and a circular portion 36b is integrally formed on the upper portion of the flange portion 34,
The lower knife 28 is detachably positioned and fixed to a mounting base 38 having a desired shape via a flange portion 34. Mounting base 38
A female attachment portion 38a is formed on the side of the attachment portion, and fixtures 40 are arranged on both left and right sides of the attachment portion 38a so as to be respectively fixable via screws 42. Then, the female mounting portion 38
Lower knife 28 positioned in the front-back direction with respect to a
Is fixed to the mounting base 38 via a pair of fixing members 40, 40. Further, the mounting base 38 is provided with fool holes at three positions, and the first fixing screws 44 inserted through the fool holes are provided.
By screwing a screw into a screw hole (not shown) formed corresponding to the female mounting position of the bed portion 12,
8 is fixed to the bed portion 12. The mounting base 38 is configured to be movable in the horizontal direction by loosening the first fixing screw 44 by the difference between the diameter of the shaft portion of the screw 44 and the inner diameter of the hollow hole. Position adjustment is performed.

A pivot 46 is vertically disposed on the mount 38 at a position aligned with the straight portion 36a of the lower knife 28, and a required length dimension is provided at an end of the pivot 46 projecting from the lower surface of the mount. The rectangular guide plate 48 is horizontally rotatably supported. The guide plate 48 is positioned and fixed via a second fixing screw 50 which is inserted through a fool hole formed in the mounting base 38. By loosening the second fixing screw 50, the pivot shaft 46 is released. It can be rotated horizontally within the required angle range (see FIG. 7). Further, at the female mounting position of the bed portion 12, a feed line 2 passing through the center of the needle bar 20 facing the reference position P shown by a dashed line in FIG.
4, a long groove 52 orthogonal to the line extending in the front-rear direction is formed over a required length, and the guide plate 48 is slidably fitted in the long groove 52. It should be noted that the long groove 52 is formed with two screw holes spaced apart from each other in the longitudinal direction thereof, and each of the screw holes has a third fixing screw 5 which is inserted into a fool hole formed in the guide plate 48.
The guide plate 48 can be positioned and fixed in the long groove 52 by screwing 4 in. That is, by loosening the third fixing screw 54 while the mounting base 38 and the guide plate 48 are positioned and fixed by the second fixing screw 50, as shown in FIG. 5 and FIG.
8 and 8 can be integrally translated along the long groove 52.

At the female mounting position of the bed portion 12, as shown in FIG.
As shown in FIG. 5, an L-shaped holder 56 is fixed via a screw 58, and the long groove 52 and an adjusting screw 60 extending in the direction are rotatably attached to the holder 56. The adjusting screw 60 is screwed into a screw hole 62 formed at a corresponding position of the mounting base 38, and by rotating the adjusting screw 60 in a required direction with the third fixing screw 54 loosened. The mount 38 is configured to move in the left-right direction along the long groove 52. Further, the holder 56 is configured to be movable with respect to the bed portion 12 by loosening the screw 58. In this state, the second fixing screw 50 is loosened and the adjusting screw 60 is rotated in a required direction. Mounting base 3
8 is horizontally rotated about the pivot 46.

[0015]

Next, the operation of the knife position adjusting device according to the embodiment will be described. Lower knife 28 on the bed 12
When positioning and fixing the mounting base 38, first, with the guide plate 48 disposed on the mounting base 38 fitted in the long groove 52,
The three first fixing screws 44, which are inserted through the hollow holes, are loosely screwed into the corresponding screw holes, and the mounting base 38 is mounted in an adjustable state.

(Regarding Adjustment of Lower Female Mounting Base) The guide plate 48 is positioned and fixed in the long groove 52 through the third fixing screws 54, 54, and the mounting base 38 and the guide plate 48 are also fixed.
And are positioned and fixed via the second fixing screw 50. Then, with the screws 42 of each fixture 40 provided on the mounting base 38 loosened, the lower knife 28 is moved forward and backward with respect to the knife mounting portion 38a, and the position of the lower knife 28 is adjusted. The lower knife 28 is positioned and fixed to the mount 38 by tightening the screw 42 of each fixture 40. As a result, the lower knife 28 is positioned in the Y direction (front-back direction) in the movement pattern of the feed table 24.

(Regarding the adjustment when the linear portion of the lower knife is displaced in a state of being parallel to the reference line) The mounting base 38
5 is attached to the knife mounting position, as shown in FIG. 5 or FIG.
When a (the center line passing through the straight line portion 36a is indicated by a chain double-dashed line) is displaced parallel to the left-right direction, the mounting base 38 and the guide plate 4
8 and 8 are positioned and fixed via the second fixing screw 50, and the third fixing screw 5 for fixing the guide plate 48 and the long groove 52.
Loosen 4,54. In this state, if the adjusting screw 60 is rotated in the required direction, the guide plate 48 and the mounting base 38 move integrally in parallel along the long groove 52. Then, at the position where the straight line portion 36a of the lower knife 28 coincides with the reference line P, the guide plate 48 and the long groove 52 are fixed to the third fixing screws 54, 54.
The lower knife 28 is accurately positioned by fixing the lower knife 28 via the.

(Regarding the adjustment when the straight part of the lower knife is inclined at a required angle with respect to the reference line) The mounting base 38
7, the straight portion 36a of the lower knife 28 (the center line passing through the straight portion 36a is indicated by a chain double-dashed line) is tilted by a required angle with respect to the reference line P when the is attached to the knife mounting position. In this case, the guide plate 48 and the long groove 52 are fixed via the third fixing screws 54, 54, and the second fixing screw 50 fixing the mounting base 38 and the guide plate 48 is loosened. Further, if the adjusting screw 60 is rotated in a required direction while the holder 56 of the adjusting screw 60 is movable, the mounting base 38 is horizontally rotated about the pivot 46. Then, by fixing the guide plate 48 and the mounting base 38 via the second fixing screw 50 at the position where the linear portion 36a of the lower knife 28 is aligned with the reference line P, the lower knife 28 is accurately positioned. Is done.

The adjustment work is completed by fixing the lower knife 28 at the correct position by performing the above-mentioned adjustments and then fixing the mounting base 38 and the bed portion 12 by the three third fixing screws 54.

As described above, in this embodiment, since the mounting base 38 can be moved in parallel along the long groove 52 while the lower knife 28 disposed on the mounting base 38 is held in a fixed posture, the adjustment thereof can be made. Occasionally, the deviation in the other direction can be prevented. Also, when adjusting the angle deviation of the lower knife 28 with respect to the reference line P, the mounting base 38 can be horizontally rotated around the pivot 46, so that the deviation in the other direction can be prevented during this adjustment. You can Therefore, the operator can easily perform delicate position adjustment, which has the advantage of improving the work efficiency.

[0021]

As described above, according to the knife position adjusting device for eyelet boring machines according to the present invention, when the knife arranged on the mounting base is moved and adjusted in the direction orthogonal thereto, the bed is adjusted. Under the guiding action of the long groove formed in the portion and the guide member arranged in the mounting base, the parallel movement can be performed in the same posture. Further, when adjusting the position of the straight portion of the knife in the circumferential direction, the adjustment can be performed around the pivot axis. That is, since there is no movement in a direction different from the direction of adjustment, the adjustment can be performed accurately and easily. This has the advantage that the time required for adjustment can be shortened and the work efficiency can be improved. Further, since the position of the mounting base is adjusted through the adjusting means arranged on the bed portion, fine adjustment can be easily performed as compared with manual work by an operator.

[Brief description of drawings]

FIG. 1 is a schematic plan view of a knife position adjusting device according to an embodiment.

FIG. 2 is an overall side view showing a schematic configuration of an eyelet buttonhole sewing machine in which the knife position adjusting apparatus according to the embodiment is implemented.

FIG. 3 is a schematic perspective view showing a knife position adjusting device according to an embodiment.

FIG. 4 is a schematic perspective view showing a knife position adjusting device according to an embodiment.

FIG. 5 is an explanatory view showing a state in which the mounting base is moved in parallel along the long groove in the knife position adjusting device according to the embodiment.

FIG. 6 is an explanatory view showing a state in which the mounting base is moved in parallel along the long groove in the knife position adjusting device according to the embodiment.

FIG. 7 is an explanatory diagram showing a state in which the attachment base is horizontally rotated about a pivot in the knife position adjusting device according to the embodiment.

[Explanation of symbols]

 12 Bed part 26 Work cloth 28 Lower knife 30 Hammer 32 Cutter device 36a Straight part 38 Mounting base 46 Axis 48 Guide plate 50 Second fixing screw 52 Long groove 56 Holding tool 60 Adjusting screw

Claims (3)

[Claims] 1. A knife (28) disposed on the bed (12) via a mount (38) so that the position of the knife (28) can be adjusted, and a hammer (30) which can be contacted and separated from the knife (28) from above. Cutter device consisting of (32)
By activating the hammer (30) at the required timing with the work cloth (26) facing between the knife (28) and the hammer (30), and cutting the work cloth (26) with a knife shape. In the eyelet buttonhole sewing machine that forms a long groove (52) formed in the bed portion (12) and extending in a direction intersecting with the straight portion (36a) of the knife (28) disposed in the mounting base (38). ), A guide member (48) slidably fitted in the long groove (52) and positionally fixable in the long groove (52), and a mounting base (38) mounted on the guide member (48) for horizontal rotation. A pivot shaft (46) movably supported and a fixing means (50) for positioning and fixing the mounting base (38) to the guide member (48), and the mounting base (38) to the guide member (48). With the positioning fixed, position adjustment of the mounting base (38) in the extending direction of the long groove (52),
The mounting base (38) relative to the guide member (48) is released from the fixed position, the mounting base (38) is configured to adjust the position in the circumferential direction around the pivot (46). A knife position adjusting device for eyelet sewing machines. 2. An adjusting means for adjusting the bed portion (12) in the extending direction of the elongated groove (52) of the mounting base (38) and in the circumferential direction around the pivot (46). 56, 60) is provided, and the knife position adjusting device for the eyelet buttonhole sewing machine according to claim 1. 3. The knife position adjusting device for a eyelet buttonhole sewing machine according to claim 1, wherein a knife (28) is mounted on the mount (38) so that the position of the knife (28) can be adjusted in a direction intersecting the elongated groove (52).