JPH0359720B2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention is useful when sewing the instep and sole of shoes or cloth shoes (particularly the instep periphery and sole periphery where the toes of the foot are inserted), or when pleating the sewn product. The present invention relates to a differential feed sewing machine used for sewing, and particularly to a presser device for a sub-feed dog of a differential feed sewing machine.

(Prior Art) As a conventional presser device for a sub-feed tooth of a differential feed sewing machine, there is one disclosed, for example, in Japanese Utility Model Publication No. 54-35804.

However, as seen in the conventional presser device for the sub-feed dog mentioned above, when the main feed dog and the sub-feed dog are not differentially moved, the presser part of the presser member of the presser device must be moved from the sub-feed dog to a predetermined position in the horizontal direction. When the main feed dog and the sub-feed dog are moved apart and retracted, the presser part of the presser member is positioned opposite to the sub-feed dog from the separated and retracted part, and the presser member is immobilized at that position. However, since the device must be configured to do so, there is a problem that the device inevitably becomes complicated and large.

(Object of the invention) The present invention has been made in view of the above circumstances, and its purpose is to reduce the complexity of devices,
An object of the present invention is to provide a presser device for an auxiliary feed dog of a differential feed sewing machine which can eliminate the problem of increasing the size of the sewing machine.

(Structure of the invention) In order to achieve the above object, in the first invention,
A fixed base formed at a predetermined height is mounted on the bed, and has a tongue piece at the tip that is positioned opposite to the sub-feed dog, and an operating piece that protrudes upward to the rear side from the tongue piece. An arm member having an abutting part that slopes downward in the distal direction is held in a state in which the tongue protrudes outward from the fixing base and the lower surface of the abutting part utilizes the elasticity of the material of the arm member. It is horizontally rotatably mounted on the fixed base in a state in which it is in elastic contact with the upper peripheral edge of the fixed base, and the upper peripheral edge of the fixed base is attached to the abutment portion as the tongue piece of the arm member approaches the sub-feed dog. The radius of curvature is gradually increased so that the lower surface comes into stronger elastic contact with the upper periphery of the fixed base, and the rotation of the arm member is restricted when the tongue piece of the arm member is positioned opposite to the sub-feed dog. This is a regulatory measure.

Further, in the second invention, in addition to achieving the above object, the configuration of the first invention is provided for the purpose of making it possible to properly perform differential movement between the main feed dog and the sub feed dog without error when necessary. In addition, a micro switch is provided that comes into contact with the arm member and turns on the differential between the sub feed dog and the main feed dog when the tongue piece of the arm member is positioned opposite to the sub feed dog. It is something.

(Function) According to this configuration, when the main feed dog and the sub feed dog are not to be differentially moved, the operating piece is pinched with fingers and the arm member is rotated in the direction in which the tongue piece moves away from the sub feed dog. , it is sufficient to keep the tongue piece apart from the sub-feed dog.

In order to differentially move the main feed dog and the sub feed dog, it is sufficient to pinch the operation piece with fingers and rotate the arm member until it comes into contact with the regulating means. Then, the tongue piece of the arm member is positioned opposite to the sub-feed dog, and
The contact lower surface of the arm member is more strongly contacted with the upper peripheral edge of the fixed base than when the tongue piece is separated from the sub-feed dog, so the arm member is is ensured in an immobile state.

As described above, the present invention brings the contact lower surface of the arm member into elastic contact with the upper peripheral edge of the fixing table by utilizing the elasticity of the material of the arm member, and also brings the tongue piece of the arm member closer to the sub-feed dog. Since the elastic contact force is strengthened the further the arm is moved, the tongue piece is positioned opposite to the auxiliary feed dog, which not only allows for easy and smooth rotation of the arm member, but also prevents the device from becoming complicated and large. It is.

(Embodiment) An embodiment of the present invention will be described below with reference to the drawings of FIGS. 1 to 6.

Furthermore, most of the sewing of shoes and cloth shoes is carried out using a lockstitch configuration, but seams tend to break during the press process after sewing. A double chainstitch construction is becoming the most suitable sewing construction for such shoes and cloth shoes. Therefore, in this embodiment, a case where the present invention is applied to a double chainstitch differential feed sewing machine will be described.

FIG. 1 is a perspective view showing the main body of a double chainstitch differential feed sewing machine.

In the figure, 1 is a bed, 2 is an arm integrally formed on the bed 1, 3 is a throat plate, 4 is a presser foot, and 5 is a sewing machine needle attached to the tip of an iron bar 6.

Note that a looper (not shown) corresponding to the sewing machine needle 5 is provided at the bottom of the throat plate 3.

FIG. 2 is a side view showing the sub-feed dog 7 and the main feed dog 8 which are divided into the front and back, and the main feed dog 8 is attached to the presser foot 4.
The sub-feed dog 7 is disposed on the front side (operator side) of the main feed dog 8.

FIG. 3 is a perspective view showing the holding device 9 for the sub-feed dog 7. As shown in FIG. The holding device 9 mainly includes a fixing base 91 and an arm member 92 formed at a predetermined height, and the fixing base 91 is mounted on the bed 1. The arm member 92 is made of an elastic material such as a metal plate, and has a tongue piece 92a formed at its tip to face the sub-feed dog 7, and can be operated to protrude upward from one side on the rear side of the tongue piece 92a. A piece 92b is formed, and an abutting portion 92c that slopes downward in the distal direction is further formed in the intermediate portion. Then, in a state in which the tongue piece 92a protrudes outward from the fixed base 91 and a lower surface of the contact portion 92c is in elastic contact with the upper peripheral edge 91a of the fixed base 91 using the elasticity of the material of the arm member 92. The base of the arm member 92 is attached to the fixed base 91 with screws 93 or the like so as to be horizontally rotatable.

The upper peripheral edge 91a of the fixed base 91 has a radius of curvature r that gradually increases from the front side toward the rear side, so that the tongue piece 92 of the arm member 92
The closer a is to the sub-feed dog 7, the more strongly the lower surface of the contact portion 92c of the arm member 92 is brought into elastic contact with the upper peripheral edge 91a of the fixed base 91, so that the tongue piece 92a of the arm member 92 is placed on the sub-feed dog 7. The arm members 92, especially the tongue pieces 92a, are kept immobile so that they do not move involuntarily when they are placed in opposing positions.

Further, in order to restrict the rotation of the arm member 92 when the tongue piece 92a of the arm member 92 is positioned opposite to the sub-feed dog 7, a restriction means consisting of a positioning pin 94 is provided on the fixed base 91. .

Next, the operation of this embodiment will be explained by taking as an example the case where the upper 41 and the sole 42 of a cloth shoe 40 are sewn together as shown in FIGS. 4 and 5.

Here, as shown in FIG. 4, the setting location around the tip of the cloth shoe 40 must be sewn so that the upper part 41 is raised against the sole 42.

Therefore, when sewing from position A to position B in FIG. Pinch the operating piece 92b with your fingers and move the arm member 92 to the solid line position in FIG.
Rotate the tongue piece 92a clockwise until it contacts the positioning pin 94, and as shown in FIG.
Insert between the bottom 42 and the upper 41. As a result, the tongue piece 92a of the arm member 92 is positioned opposite to the sub-feed dog 7, and the upper 41 is pressed against the sub-feed dog 7, and the lower surface of the abutting portion 92c of the arm member 92 The strong elastic contact with the upper peripheral edge 91a ensures that the arm member 92 remains immobile, and prevents the arm member 92 from moving involuntarily.

Next, the auxiliary feed dog 7 is moved differentially with respect to the main feed dog 8, and while forming a shrinkage only in the fabric of the upper 41, it is sewn together with the fabric of the bottom 42.
1 should be raised so that it surrounds the toes of the foot.

When the sewing around the tip l is finished, pinch the operation piece 92b with your fingers and rotate the arm member 92 forward to remove the tongue piece 92a from between the bottom 42 and the instep 41, and then the arm member 92 is sewn. It is separated from the auxiliary feed dog 7 so as not to get in the way. and,
By releasing the differential movement of the auxiliary feed dog 7 with respect to the main feed dog 8 and sewing to position B, it is possible to complete the sewing of the upper 41 and the bottom 42 as shown in FIG. 5.

Next, an embodiment according to the second invention will be described with reference to the drawing of FIG.

In addition to the configuration of the embodiment according to the first invention, this embodiment has the advantage that when the tongue piece 92a of the arm member 92 is positioned opposite to the sub-feeding tooth 7, it comes into contact with the arm member 92 to cause differential feed. The structure is such that a micro switch 50 is provided on the bed 1, and the micro switch 50 is in the ON state to start the movement, and the micro switch 50 is in the OFF state to stop the differential feed when the contact of the arm member 92 is released.
By doing so, differential feeding can be properly started and canceled, and differential feeding can be automatically started and canceled.

In the above embodiment, the present invention is applied to a double chainstitch differential feed sewing machine, but the present invention may also be applied to a lockstitch differential feed sewing machine.

(Effects) As explained above, the presser foot device for the sub-feed dog of the differential feed sewing machine of the present invention can perform the same functions as the conventional presser foot device, but has a significantly larger structure than the conventional presser foot device. can be simplified, and the increase in size of the device can also be effectively avoided.

Furthermore, if a micro switch is provided as in the second invention, it becomes possible to properly start and cancel differential feed without error, and it becomes possible to start and cancel differential feed automatically. Become.

[Brief explanation of drawings]

1 to 6 show an embodiment of the first invention, FIG. 1 is an external perspective view of a double chainstitch differential feed sewing machine, and FIG. 2 is a side view showing the main feed dog and sub feed dog. 3 is a perspective view showing the presser device for the sub-feed dog, FIG. 4 is a plan view of the sewing product, FIG. 5 is a perspective view of the sewing product, and FIG. 6 is a perspective view showing the sewing state. 7th
The figure is a perspective view showing an embodiment of the second invention. 1...Bed, 7...Sub feed dog, 9...Press device for sub feed dog, 50...Micro switch, 9
1... Fixed base, 91a... Upper periphery, 92... Arm member, 92a... Tongue piece, 92b... Operation piece, 9
2c...Abutment part.

Claims (1)

[Scope of Claims] 1. A fixed base formed at a predetermined height is mounted on the bed, and has a tongue piece at the tip to be positioned opposite to the sub-feed dog, and protrudes upwardly and backwardly from the tongue piece. The arm member has an operating piece that is tilted downward in the distal direction at the intermediate portion thereof, and the arm member is arranged such that the tongue protrudes outward from the fixing base and the lower surface of the abutting portion is attached to the arm member. It is horizontally rotatably mounted on the fixed base in a state in which it is in elastic contact with the upper periphery of the fixed base using the elasticity of the material, and the upper periphery of the fixed base connects the tongue piece of the arm member to the sub feed dog. The radius of curvature is gradually increased so that the lower surface of the contact portion comes into stronger elastic contact with the upper peripheral edge of the fixed base as the arm approaches the upper peripheral edge of the fixed base, and the tongue piece of the arm member faces the sub-feed dog. 1. A presser device for a sub-feed dog of a differential feed sewing machine, comprising a regulating means for regulating rotation of an arm member when the arm member is positioned. 2 A fixed base formed at a predetermined height is mounted on the bed, and has a tongue piece at the tip that is positioned opposite to the sub-feed dog, and an operating piece that protrudes upward from the tongue piece to the rear side. An arm member having an abutment part inclined downward in the distal direction at the intermediate part is arranged such that the tongue protrudes outward from the fixing base, and the lower surface of the abutment part takes advantage of the elasticity of the material of the arm member. The arm member is horizontally rotatably mounted on the fixed base in a state in which it is in elastic contact with the upper peripheral edge of the fixed base, and the upper peripheral edge of the fixed base is adapted to bring the tongue piece of the arm member closer to the sub-feed dog. The radius of curvature is gradually increased so that the lower surface of the abutment part comes into stronger elastic contact with the upper peripheral edge of the fixed base, and when the tongue piece of the arm member is positioned opposite to the sub-feed dog, A sub-type of a differential feed sewing machine characterized by being provided with a micro switch that contacts an arm member to turn on the differential between the sub-feed dog and the main feed dog, and a regulating means that regulates rotation of the arm member. Feed dog holding device.