JPH0518479U - Presser foot device for rake stitch sewing machine - Google Patents

Abstract

(57) [Summary] [Purpose] To stabilize the condition of the cloth and to enable good rake sewing. [Structure] Two cloth pressers 2 and 3 for pressing a cloth N pushed up by plungers 6 and 7 are pivotally attached to a pivot 1 in a vertically rotatable manner with a guide plate 20 interposed therebetween. The presser foot 2 is provided with a screw hole 2b. Cloth foot 3 and guide plate 20
The through holes 3b and 20b having a diameter larger than the screw hole 2b are formed in. From the presser foot 3 side to the fastening bolt 21, through holes 3b, 20b
, And the two presser foots 2 and 3 and the guide plate 20 are integrally fastened. The diameter of the through holes 3b and 20b is larger than that of the fastening bolt 21. Therefore, the vertical positions of the cloth presser 3 and the guide plate 20 with respect to the cloth presser 2 can be adjusted relatively. [Effect] Since the two cloth pressers 2 and 3 move up and down in a constant state adjusted by the fastening bolts 21, the cloth state is always stable. Therefore, the rake sewing can be performed well.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a cloth presser device for pressing a cloth which is pushed up by a plunger in a rake stitch sewing machine.

[0002]

[Prior Art]

 Known as a presser foot device for a rake sewing machine is one shown in FIGS. 4 to 6. That is, this cloth pressing device is mainly composed of two cloth pressing members 2, 3 pivotally attached to the pivot shaft 1 so as to be vertically swingable (rotatable). The two cloth pressers 2 and 3 have a cloth N which is pushed up by fan-shaped plungers 6 and 7 which are alternately rotated about drive shafts 4 and 5 and which are fixed by pressing portions 2a and 3a at the tips. Hold in position.

Stopper bolts 8 and 9 are screwed to the root ends of the cloth pressers 2 and 3, respectively, and come into contact with the needle plate 11 to stop the lifting of the pressers 2a and 3a. Each of the presser foots 2 and 3 is individually biased by springs 12 and 13 so that the presser portions 2a and 3a are lowered. Below the needle plate 11, there are provided pressers 14 and 15 which are moved by a spring (not shown) to push up the entire cloth N.

The needle 16 is pushed up by the plunger 6 and held by the pressing portion 2a of the cloth presser 2, and the needle 16 is pushed up by the plunger 7 and pressed by the pressing portion 3a of the cloth presser 3. The cloth N and the cloth N are moved in an arc in a direction perpendicular to the paper surface in FIG. The cloth N is transferred from left to right in FIG.

Reference numeral 17 is a spring provided between the stopper bolts 8 and 9 and the cloth pressers 2 and 3, and prevents the stopper bolts 8 and 9 from loosening. 5 and 6 show the scooping of the hem of the pants, and the edge Na is folded to the left in FIG. 6 after the sewing. Therefore, the sewn portion is hidden by the edge Na. In FIG. 6, the upper side is the inside of the pants. The width W of the pressing portions 2a and 3a of the cloth pressers 2 and 3 is set to about 4 mm due to the relationship with the groove 11a of the needle plate 11. Each plunger 6,7 has its own spring (not shown) in order to automatically lower the plungers 6,7 by the increase in thickness when the thickness of the cloth changes greatly (the left and right mating parts in trousers). ) Is urged upwards.

[0006]

[Problems to be solved by the device]

 In the above-described conventional cloth presser device, as described above, the presser foots 2, 3 are urged by the springs 12, 13 so that the presser portions 2a, 3a are lowered, so that the plungers 6, 7 are lowered. When it is turned to, the pressing parts 2a 1 and 3a are lowered so as to follow the plungers 6 and 7. When the descending of the presser portions 2a and 3a of the cloth pressers 2 and 3 are closely observed, the cloth N is pressed against the presser portion 3a (2a) of one cloth presser 3 (2) by the plunger 7 (6). In a predetermined state, the vertical position of the pressing portion 2a (3a) of the other cloth pressing member 2 (3) is not constant and changes vertically depending on the occasion.

The above-described change in the vertical position is caused by the contact between the two presser foots 2 and 3 whose strengths (hands) of the springs 12 and 13, the rake sewing speed, the thickness of the cloth N, and the vertical movements are opposite to each other. It is considered that the relationship and the like slightly change each time the needle 16 is sewn, but in any case, the presser portions 2a and 3a of the cloth pressers 2 and 3 which are rotated downward by the springs 12 and 13 are As a result, the condition of the cloth N is not stable and the finish of the rake stitch is adversely affected.

An object of the present invention is to provide a cloth presser device for a rake stitch sewing machine capable of performing rake sewing while keeping cloth portions related to two cloth pressers in a predetermined state.

[0009]

[Means for Solving the Problems]

 In order to achieve the above-mentioned object, the present invention corresponds to a cloth pressed by two plungers which are moved alternately, respectively corresponding to the two plungers, and a pressing direction of the cloth by the plunger with a pivot as a fulcrum. In a presser foot device for a rake stitch sewing machine that presses with a presser foot that is swingably attached to a sewing machine, the above two presser foot are fastened so that the relative position of the presser foot in the swing direction can be adjusted. The structure is such that they are mutually integrated by means.

[0010]

[Action]

 Adjust so that the presser foot section of the presser foot that presses the thick cloth section is slightly lower than the presser foot section of the cloth presser that presses the thin cloth section, and unite both cloth pressers with the fastening means. To conclude. Since the thick cloth part is pushed up by the plunger and compressed by the cloth presser with a stronger force, it slightly bulges upward at the sewn position, which is slightly away from the presser foot of the cloth presser (around 1 mm). ..

The needle sews the bulged portion just like a thin, barely bulged upper fabric portion. The two work clamps rotate up and down with the pivot as a fulcrum following the pressing motion of the two plungers that are performed alternately, but since they are fastened together by the fastening means, When the cloth is pressed against the presser foot by the plunger, the vertical position of the presser foot of the other cloth presser is kept constant without changing. For this reason, the cloth condition is stable with respect to the rake stitch, and the rake stitch is favorably performed.

[0012]

【Example】

 1 to 3 show an embodiment of a presser foot device for a rake stitch sewing machine according to the present invention. In these figures, the same members and the like as those in FIGS. 4 to 6 are designated by the same reference numerals, and detailed description thereof will be omitted.

A screw hole 2b is formed in the central portion of one cloth presser 2. A through hole 3b having a diameter larger than that of the screw hole 2b is formed in the central portion of the other cloth presser 3. A guide plate 20 having a guide portion 20a at its tip is provided between the two cloth pressers 2 and 3. The guide plate 20 has its guide portion 20a disposed between the presser portions 2a and 3a, and is pivotally attached to the pivot shaft 1 in the same manner as the presser foots 2 and 3 in such a manner that the guide plate 20 is rotatable up and down. A large diameter through hole 20b is formed.

The cloth pressers 2 and 3 and the guide plate 20 are tightening bolts (fastening means) 21 screwed from the cloth presser 3 side to the screw holes 2 b of other cloth pressers 2 through the through holes 3 b and 20 b. Are fastened together by The diameter of the fastening bolt 21 is sufficiently smaller than that of the through holes 3b and 20b. Therefore, the presser foot 3 and the guide plate 20 can adjust the relative position in the vertical direction with respect to the presser foot 2.

The stopper bolt 9 is screwed to the member 22 on the side of the needle plate 11, and the projection 3 c provided on the cloth presser 3 is brought into contact with the stopper bolt 9 to move the cloth pressers 2 and 3 and the guide plate 20 upward. Prevent excessive movement. The pivot 1 is fixed to the member 22 by a fixing screw 23.

Next, the operation of the presser foot device for the rake stitch sewing machine according to the present invention constructed as described above will be described. Normally, the presser foot part 3a of the presser foot 3 that presses the thick cloth part where the three cloths N overlap is slightly lower than the presser foot part 2a of the presser foot 2 that presses only one thin cloth part. In addition, the guide portion 20a of the guide plate 20 is adjusted to be slightly lower than the presser portions 2a and 3a, and the fastening bolts 21 are tightened to integrally fasten the presser foots 2, 3 and the guide plate 20. To do.

During the operation of scooping, the thick cloth portion is pushed up by the plunger 7 and compressed by the cloth presser 3 with a stronger force. Therefore, at the rake position where the cloth presser foot 3 is slightly distant from the outside, the cloth bulges slightly upward. Since this bulging of the thick cloth portion is adjusted to be at the same level as the thin cloth N portion which is pushed up by the other plunger 6 and is pressed by the cloth presser 2, the needle 16 has the thick portion and the thin portion as well. Similarly, sew properly. The guide plate 20 guides the folded portion of the edge Na of the cloth N by the guide portion 20a.

The two presser foots 2 and 3 and the guide plate 20 follow the pressing movements of the two plungers 6 and 7 that are alternately performed, and rotate vertically with the pivot 1 as a fulcrum. Since the cloth pressers 2 and 3 and the guide plate 20 are integrally connected to each other by the fastening bolts 21, the cloth N is pressed by the plunger 7 (6) to the pressing portion 3a (2a) of one cloth presser 3 (2). In the raised state, the vertical position of the presser portion 2a (3a) of the other cloth presser 2 (3) does not change and is always held constant. In other words, the work clamps 2 and 3 corresponding to the descending plungers 6 and 7 will not run wild. Therefore, the state of the cloth N is always stable with respect to the rake sewing.

The protrusions 3c may be provided on the presser foot 2 or the guide plate 20, or the stopper bolt 9 may be screwed to the presser foot side as shown in FIG. Further, the spring 12 is provided on the side of the presser foot 2, but it may be provided on another portion. A screw hole may be provided in the presser foot 3 and the fastening bolt 21 may be screwed into the screw hole. Needless to say, at this time, the screw hole of the presser foot 2 becomes a through hole. The means for integrally fastening the presser foots 2, 3 and the guide plate 20 is not limited to that shown in the figure.

[0020]

[Effect of the device]

 As described above, in the cloth presser device for a rake sewing machine according to the present invention, the cloth pressed by the two plungers that are alternately moved correspond to the two plungers individually, and the pivot is used as the fulcrum. In the presser foot device of the rake stitch sewing machine, in which the presser foot that is swingably provided in the pressing direction of the cloth by the plunger is used to perform the rake sewing, the two presser feet are oscillated. Since the structure is such that the relative positions in the two directions are adjustable and the parts are fastened to each other integrally by fastening means, the presser foot corresponding to the plunger on the descending side does not go wild, and the cloths related to the two presser foot It is possible to sew well by keeping the part in a predetermined state at all times.

Further, since the guide plate can be vertically provided between the two cloth retainers, the cloth can be accurately fed along the guide plate, and also in this respect, the rake sewing is good. Become. In addition, since only one stopper bolt or the like, which has conventionally required two, is required, there is an advantage that the structure is simplified as a whole.

[Brief description of drawings]

FIG. 1 is a partially cutaway plan view showing an embodiment of a cloth pressing device for a rake stitch sewing machine according to the present invention.

FIG. 2 is a sectional view of a main portion taken along the line II-II in FIG.

FIG. 3 is a side view of a partially-broken presser foot and a guide plate.

FIG. 4 is a plan view of a conventional presser foot device for a rake stitch sewing machine.

FIG. 5 is a side view showing a relationship between a cloth presser and a plunger or the like of a conventional cloth presser device.

FIG. 6 is a cross-sectional view showing a relationship between a conventional presser foot and a plunger or the like.

[Explanation of symbols]

 1 Axis 2,3 Cloth presser 2a, 3a Presser part 6,7 Plunger 21 Fastening bolt (fastening means) N Cloth

Claims (1)

[Scope of utility model registration request] 1. A cloth which is pressed by two plungers which are alternately moved is provided so as to individually correspond to the two plungers and which is swingable in a pressing direction of the cloth by the plunger with a pivot as a fulcrum. In a cloth presser device for a rake stitch sewing machine that presses a cloth presser foot to perform rake sewing, the two cloth pressers are integrally fastened together by fastening means so that the relative position of the cloth presser in the swinging direction can be adjusted. This is a presser foot device for a sewn sewing machine.