JPH06358U - Sewing machine cloth presser - Google Patents

Abstract

(57) [Abstract] [Object] An object of the present invention is to provide a presser foot lifting device capable of raising a cloth presser member without generating noise. [Structure] The invention is to fix a cloth pressing member to a lower end of a pressing rod slidably supported on a sewing machine arm in a vertical direction,
In the cloth presser device in which the presser bar is urged by the presser spring to press the cloth, and the presser bar can be raised against the presser spring, the presser foot lifting lever is operated. The linking means 12 to 15 are provided in conjunction with each other, and a pressure contact plate 20 that constantly elastically presses against a predetermined movable portion of the linking means, for example, the pull-up link 14 is provided.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 According to this invention, a cloth pressing member which is urged by a spring is pressed near the needle drop position of the cloth placed on the needle plate, and the cloth pressing member can be appropriately raised against the spring. The present invention relates to a cloth pressing device.

[0002]

[Prior art]

 Conventionally, a sewing machine is provided with a cloth pressing device as shown in FIG. In the figure, reference numeral 1 denotes a presser bar which is held by a presser bar metal Ma provided at the tip of the sewing machine arm M1 so as to be able to move up and down. The cloth pressing member 2 that is pressed near the position is fixed. Further, 3 is a presser spring. The presser spring 3 is interposed between a presser bar adjusting screw 4 provided at the upper end of the sewing machine arm M1 and the presser bar 1, and the spring 3 urges the presser bar 1 downward to cover the cloth presser member 2 with a cloth. By pressing the cloth in the vicinity of the needle drop position, the cloth is engaged with the feed dog to convey the cloth, and the cloth is prevented from fluttering when the sewing needle moves up and down.

In addition, a cloth pressing device of this type is usually provided with a presser lifting mechanism having the following configuration, whereby the cloth pressing member 2 can be appropriately raised when setting or taking out the cloth. It is like this. In FIG. 4, reference numeral 5 denotes a knee support lever (presser lifting operation lever) provided on the bottom surface of the sewing machine bed, and a worker presses the knee support portion 5a with the knee so that the knee support portion 5a is moved laterally via the mounting arm 6. The shaft 7 rotates, and the rotating arm 8 rotates upward with the rotation. When the knee rest lever 5 is released, the horizontal shaft 7 is returned to the initial position by the winding spring 9, and the knee rest lever 5 and the rotating arm 8 are also returned to the initial position accordingly. Further, the lower end of the push-up rod 10 inserted in the oil pan M O arranged below the sewing machine table T is in contact with the upper surface of the rotating arm 8 and moves up and down as the rotating arm 8 moves up and down. It is like this.

On the other hand, an L-shaped turning link 12 is rotatably supported by a support shaft 12a in the base of the sewing machine arm M1, and the lid 10a of the push-up rod 10 is provided at one end thereof. Is connected to the connecting shaft 11. Then, when the push-up bar 10 is moved up and down and the connecting shaft 11 is moved up and down, the rotating link 12 is rotated around the support shaft 12a.

An L-shaped pull-up link 14 is rotatably attached to the front part of the sewing machine arm M1 by a fulcrum shaft 14a. One end of the pull-up link 14 is connected to the other end of the rotary link 12 by a horizontal bar 13 so that the pull-up link 14 can be rotated in conjunction with the rotary link 12. Furthermore, a lifting plate 15 is pivotally attached to the other end of the lifting link 14. The pull-up plate 15 has an abutting portion 15a facing the lower surface of a presser bar hanger (locking member) 1a provided at the upper end of the presser bar 1, and the pull-up link 14 has an arrow A. By rotating in the direction, the contact portion 15a contacts the lower surface of the presser bar holder 1a and pushes it up, and the presser bar 1 is raised against the presser spring 3.

As described above, in the above-described presser foot lifting mechanism, by pushing and releasing the knee support portion 5a of the knee support lever 5, the push-up bar 10 and the connecting shaft 11 are moved up and down, and the linkage mechanism 12 to 15 operates. Then, the presser bar 1 is moved up and down. Further, in addition to the above-described presser foot lifting operation of the knee support lever 5 with the knee contact portion 5a, the presser foot lifting mechanism shown in FIG. 4 can also perform the presser foot lift operation with the manual lever (presser lift operation lever) 16. Has become. That is, the manual lever 16 is rotatably supported to the outside of the sewing machine arm M1 by the rotary shaft 17, and by rotating the lever 16 in the C direction, the rotary shaft 17 is rotated. The fixed presser lifting cam 18 rotates in the same direction to press the end face of the pull-up link 14, and the link 14 rotates in the A direction to raise the pull-up plate 15.

[0007]

[Problems to be solved by the device]

 As described above, in the above-described presser foot device, the presser bar 1 can be lifted from the lowered position by the knee support portion 5a of the knee support lever 5 and the manual lever 16, but the presser bar 1 is raised. In this case, there is a problem that a sliding noise is generated between the presser bar 1 and the presser bar metal Ma, and a chattering noise is generated in the linking means, which gives an operator discomfort. This noise is due to (a) the clearance formed between the presser bar 1 and the presser bar metal Ma and the moment generated in the presser bar causes non-uniform contact between the two members, and the presser bar 1 and the presser bar metal when ascending. The sliding frictional resistance generated with Ma becomes unstable and the presser bar does not rise smoothly, which causes minute vibrations. (B) In the connecting portion of a plurality of members forming the linking means, Since a minute gap is set and the interlocking path in the linking means is long, it is easy for each member to be excited easily.

Therefore, if a large amount of lubricant or the like is applied to the presser bar 1 or the presser bar metal Ma to reduce the sliding frictional resistance between the presser bar 1 and the presser bar metal Ma, the sliding noise as described above will be produced. It is possible to prevent the occurrence of noise and reduce noise, but since the presser bar 1 is exposed from the sewing machine arm M1 and is very close to the cloth, apply a large amount of lubricant to such parts. In that case, there is a risk that the cloth may be contaminated by the lubricant, and it was virtually impossible to reduce the noise by using the lubricant.

The present invention has been made in view of the above problems, and an object thereof is to provide a presser foot lifting device capable of raising a cloth presser member without generating friction noise.

[0010]

[Means for Solving the Problems]

 This invention has a presser bar, which is slidably supported in the vertical direction on a sewing machine arm and presses a cloth to be sewn at its lower end, and is always kept in a lowered position by the elastic force of a presser spring. A connecting shaft having a free end abutting on the upper surface of a push-up rod supported in an oil pan arranged below the table so as to be movable up and down; Linking means for connecting the presser bar and the connecting shaft for moving the presser bar from the lowered position to the upper side in conjunction with the action of the presser foot lifting lever, and a pressure contact for constantly elastically contacting a predetermined movable part of the linking means. It is provided with a board.

[0011]

[Action]

 In this invention, since the pressure contact plate is constantly elastically pressed against the movable part of the linking means for moving up and down the presser bar holder (locking member), the presser bar and the presser bar are interlocked with the action of the presser foot lifting lever. Even if a minute vibration generated in the contact portion of the rod metal is transmitted to the linking means, the vibration is suppressed by the constant light pressure contact force of the pressure contact plate, and the vibration noise in the linking means is reduced. In addition, as a result of the reduction in vibration in the linking means, the vibration generated between the presser bar and the presser bar metal interlocking with the linking means is also reduced, and the sliding friction noise generated here is also greatly reduced, so that the operator Does not make you feel uncomfortable.

[0012]

【Example】

 An embodiment of the present invention will be described below with reference to FIG. It should be noted that the same or corresponding parts as those of the above-mentioned conventional technique are designated by the same reference numerals, and the detailed description thereof will be omitted. In FIG. 1, reference numeral 20 denotes a pressure contact plate rotatably supported in the sewing machine arm by a fulcrum shaft 21, and one surface of the pressure contact plate can contact the upper end portion of the pull-up link 14. Numeral 22 is a coil spring inserted through the fulcrum shaft 21, one end of which is locked to the machine frame and the other end of which is locked to the press contact plate 20. It is designed to give a biasing force (counterclockwise). Therefore, one surface of the pressure contact plate 20 is elastically and constantly in pressure contact with the upper end portion of the pull-up link 14. The rest of the configuration is the same as that shown in the above-mentioned prior art, and a duplicate description will be omitted.

As described above, in this embodiment, since the pressure contact plate 20 is constantly in pressure contact with the pull-up link 14 (for example, about 50 to 100 g is particularly good), the knee contact portion 5a of the knee contact lever 5 or the like presses the presser bar. Even when the pressure is raised, the frictional sliding noise generated between the presser bar and the presser bar metal and the vibration noise generated in the linking means can be significantly reduced.

That is, also in this embodiment, non-uniformity of the sliding frictional force is generated between the presser bar 1 and the presser bar metal Ma due to the clearance between both members and the moment generated in the presser bar. There is a minute gap set in each connecting portion, and slight vibration is applied to the lever 5 or 16 regardless of how smooth the operator operates the lever. This is the same as the conventional one. However, in this embodiment, since the press contact plate 20 elastically abuts the pulling link 14 which is one movable member of the linking means, and the elastic force prevents the pulling link 14 from slightly vibrating. The vibrations of the other members (the pull-up plate 15, the knee-raising lateral rod 13, and the rotary link 12) connected to the are also suppressed, and the chattering noise of the vibration is not generated from the linking means.

Further, since the vibration of the linking means is suppressed, the vibration of the presser bar 1 interlocked with this is also suppressed via the linking means, and between the presser bar 1 and the presser bar metal Ma. Sliding friction noise generated is also significantly reduced. As a result, in the actual work, the presser foot can be lifted with almost no sound, and the worker can comfortably perform the presser foot lifter work without being bothered by unpleasant noise.

In the above embodiment, the case where the pressure contact plate 20 is brought into contact with the upper end portion of the pull-up link 14 has been described as an example, but the pressure contact plate 20 is brought into contact with the portion other than the upper end portion. Also, as a member to be brought into contact, it may be brought into contact with other members (pull-up plate 15, knee-raising lateral bar 13, pivotal link 12) or the like constituting the linking means. Is not particularly limited to one.

In addition to the above embodiment, the cam body 23 may be fixed to the pull-up link 14 as shown in FIG. 2, and the press plate 20 may be pressed against the cam body 23, or as shown in FIG. The same effect can be obtained even if the pressure contact plate 20 is pressed against the protrusions 24 by punching out on the raising link 14 with a press or by implanting a pin.

Further, a coil spring, a leaf spring, or the like can be used as a member for urging the pressure contact plate 20, and a member having elasticity is used for the pressure contact plate itself, and the cantilever spring is used. However, the invention is not limited to the above-described embodiment.

[0019]

[Effect of device]

 As described above, in the presser foot device according to the present invention, the pressurizing plate is elastically pressed against the movable part of the linking means for raising the presser bar, so that the noise when the presser bar is raised can be greatly reduced. The work clamp work can be performed comfortably.

[Brief description of drawings]

FIG. 1 is an enlarged front view of an essential part showing an embodiment of the present invention.

FIG. 2 is an enlarged front view of essential parts showing another embodiment of the present invention.

FIG. 3 is an enlarged front view of an essential part showing still another embodiment of the present invention.

FIG. 4 is a perspective view showing a conventional presser foot device.

[Explanation of symbols]

 M1 sewing machine arm M2 sewing machine bed 1 presser bar 2 cloth presser member 3 presser spring 5 knee support lever (presser lift operation lever) 12 rotation link 13 knee lift horizontal bar 14 lift link 15 lift plate 16 manual lever (presser lift lever) 20 Pressure plate

Claims (1)

[Scope of utility model registration request] 1. A presser bar which is slidably supported in a vertical direction on a sewing machine arm, has a cloth pressing member for pressing a cloth to be sewn at its lower end, and is always in a lowered position by elastic force of a pressing spring, and a sewing machine. A connecting shaft having a free end in contact with an upper surface of a push-up rod supported in an oil pan arranged below the table so as to be vertically movable; a presser foot operating lever for connecting the lower end of the push-up bar to move the push-up bar up and down; Linking means for connecting the holding rod and the connecting shaft for moving the holding rod upward from the lowered position in interlock with the action of the holding-lifting operation lever, and a press-contact plate for constantly elastically pressing a predetermined movable part of the connecting means. And a presser foot device for a sewing machine.