JPH0780170A - Lockstitch sewing machine with back hole button - Google Patents

Abstract

PURPOSE:To allow sawing in zigzag astride a button circular leg section by reciprocating a needle bar by a prescribed distance in the horizontal direction via the action of a cam mechanism when fitting a button having a button hole on the circular leg section protruded on the back face of the button. CONSTITUTION:When a back-hole button 40 is to be fitted, the button 40 is held by the bent arm section 52 of a button holder 50, a fabric pressing bar 28 is lowered, and part of the button 40 is inserted into a button inserting hole 36 formed on a throat plate 26. A circular arm section 41 provided on the back face of the button 40 is mounted on a pedestal 32 to cover the needle hole 34 of the pedestal 32. A handle is rotated to cause the side swing motion of the needle bar 10 by a prescribed distance via a cam driven arm interlocked with a cam, the needle bar 10 is moved to the right and left astride the circular arm section 41, a needle 8 fitted to the needle bar 10 is vertically moved, and stitches are formed with a needle thread 24 passing through the needle hole 22 of the needle 8 and a bobbin thread delivered from a shuttle provided in a base.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a lockstitch sewing machine with a back hole button. The back hole button is composed of an annular leg portion provided such that the button hole projects on the back surface of the button.

[0002]

2. Description of the Related Art Conventionally, a button of this kind has been mainly sewn to clothes by manual work. Therefore, it is inefficient and requires skill to improve work efficiency, which is a bottleneck for mass-producing clothes using back hole buttons. Therefore, the present invention has an object to eliminate such a neck, and provides a button-attached lockstitch sewing machine particularly improved for this purpose.

[0003]

[Means for Solving the Problems] Means for solving the problems will be described below. A pair of leg portions (52) and (54) for sandwiching the back hole button (40) are provided, and a cloth pressing rod (28) is provided.
And a needle plate (26) having a hole (36) into which the end of the back hole button (40) can be inserted, and a needle hole (26) provided on the needle plate (26). The hole (3
When the back hole button (40) is inserted into and lowered from the back hole button (6), the ring leg (41) protruding from the back hole button (40) can be placed on the pedestal (32) and the sewing machine main body (1). A bevel gear mechanism (13) provided on an upper shaft (12) that is movably supported.
By sliding on the cam (60) which is rotated by means of the cam, the needle bar (10) with the sewing needle (8) attached is leveled in the zigzag needle hole (34) provided in the pedestal (32). A lockstitch sewing machine with a back hole button, which is provided with a cam driven arm (42) which is movable in a predetermined direction.

[0004]

Operation: When the lockstitch sewing machine is operated with the annular leg of the button placed on the upper surface of the fabric placed on the pedestal, the needle bar reciprocates in the horizontal direction for a predetermined distance by the operation of the cam mechanism, and the button annular leg Form a zigzag stitch across the parts and sew the annular leg of the back hole button to the fabric.

[0005]

Embodiments of the present invention will be described below with reference to the accompanying drawings. FIG. 1 is a schematic diagram of a sewing machine used in the present invention. An outline of the structure and operation of a general lockstitch sewing machine that is now common will be described. An upper shaft 12 and a lower shaft (not shown) of a driving device for the sewing machine are housed in a head 2 of the sewing machine main body 1, and the upper shaft 12 and the lower shaft (not shown).
Are belt-connected. When the manual wheel balance 4 connected to the upper shaft 12 is rotated by the handle 6, the needle bar crank 16 connected to the upper shaft 12 having the crank 14 is operated, and the needle bar 10 having the sewing needle 8 attached thereto moves up and down. The needle hole 22 through the thread guides 20a to 20e.
The upper thread 24 pulled out from the sewing machine and the lower thread 25 fed from a hook (not shown) attached below the sewing machine bed 3 are intertwined with each other, and the cloth is placed on the needle plate 26 below the sewing needle 8. Form a lock stitch. Reference numeral 28 (FIG. 2) is a cloth pressing rod, which has a cloth pressing member (not shown) detachably attached to the lower end thereof. The cloth pressing rod 28 is lifted by the pressing rod lifting lever 29 against the elasticity of the coil spring 30. In the lowered state, it cooperates with a feed dog (not shown) provided on the needle plate 26 to push out the cloth while pushing it out. The feed dog makes four movements (vertical and forward / backward) by a lower shaft (not shown) connected to the upper shaft 12 by a belt, and serves to smoothly feed the cloth forward. In order to make the above-mentioned lock stitch into a zigzag stitch, a laminated cam and a follower arm which are connected to the upper shaft 12 via a bevel gear 13 which is externally fitted and fixed are employed, and the needle bar 10 is laterally swung to have various shapes. Forming zigzag seams.

Next, the structure of the present invention will be described. The main construction of the present invention comprises a pedestal 32 provided on the needle plate 26, a back hole button clamp 50, and a cam 60 for forming a specific number of zigzag stitches. As shown in FIGS. 1, 2, and 3, the pedestal 32 is fixed on the needle plate 26 by screw holes 33, and needle holes 34 for zigzag sewing are formed. Further, a button accommodating hole 36 that can accommodate a part of the back hole button 40 is provided near the needle hole 34 side of the pedestal 32 and the needle plate 2
6 to form. Next, the back hole button gripping tool 50 includes the end portion of the gripping tool body 50 and the front leg 52 and the rear leg 54 as shown in FIGS. 1, 2, 7, 8, 9, and 10. Forming a curved portion. In this embodiment, the front leg 52 is shorter than the rear leg 54, and the length of the front leg 52 is substantially equal to the radius of the back hole button 40. Back button 4 with this button clamp 50
In the state in which 0 is clamped back and forth, the button clamp 50 is attached to the cloth presser bar 28 with the screw 57 through the attachment hole 56 (FIG. 2). The short front leg 52 clamps the surface of the back hole button 40 having the annular leg portion 41, and the long rear leg 54 pushes down the lifting lever 29 with the back hole button 40 on the opposite side clamped. The back hole button 40 is inserted into the button receiving hole 36, and the annular leg portion 41 of the back hole button 40 is placed so as to cover the needle hole 34 of the pedestal 32. The cam 60 of the present invention is rotatably attached to a shaft 61 installed on the sewing machine main body 1 and is mounted on the upper shaft 12 of the bevel gear 1.
The cam 60 rotates together with the shaft 61 due to the engagement between the cam gear 3 and the cam gear attached to the shaft 61. In this embodiment, as shown in FIG. 6, the cam 60 is formed of four peaks 62, three valleys 63 and an arcuate portion 64. A cam follower arm 42 is slidably provided on the cam 60, and the follower arm 42 alternately makes horizontal motion in the direction of the arrow in accordance with the rotation of the cam 60, and the follower arm 42 moves in response to this motion. The elastic body bending portion 44, together with the auxiliary arm presser 46, elastically presses the bush 11 of the needle bar 10 at the end portion 43 thereof, while horizontally moving the needle bar 10 in the arrow direction (the left-right direction toward FIG. 5). Move it.

Next, the operation of the embodiment of the present invention will be described. First, the back hole button 40 is clamped by the button clamp 50 as already described, and the cloth pressing rod 28 is moved down by operating the elevating lever 29.
6, and the annular arm 41 is placed on the pedestal 32 so as to cover the needle hole 34 of the pedestal 32 (FIG. 2). At this time, cloth W
Is inserted under the annular arm portion 41 of the back hole button 40 and is located on the pedestal 32. Next, set the handle 6 to the manual wheel balance 4
When this is operated and rotated, the upper shaft 12 is rotated, and the cam 60 is rotated together with the cam shaft 61 via the bevel gear 13. As the cam 60 rotates, the cam follower arm 42 horizontally moves in the arrow direction while sliding on the peaks 62, the valleys 63, and the arcuate portion 64 of the cam 60. This horizontal motion causes the needle bar 10 to swing laterally for a predetermined distance via the elastic follower arm bending portion 44, the needle bar bush 11, and the like. The needle bar 10 moves left and right over the annular leg portion 41 of the back hole button 40 and passes through the needle hole 22 of the needle 8 attached to the needle bar 10 and the upper thread 24.
And the bobbin thread 2 which is fed out from the hook below the sewing machine bed 3.
Forming a lock stitch seam on the cloth W in cooperation with 5. In this embodiment, the cam 60 is provided with four peaks, three troughs, and one arcuate portion, so that it is possible to form eight stitches of zigzag stitch and four stitches of stop stitch. Needless to say, it is possible to configure the desired stitch by changing the shape of the cam.Instead of the single cam, a laminated cam is adopted, and the desired stitch can be immediately realized without changing the cam each time. It is also possible to configure. After finishing sewing, 2 cloth holding rods
When the button clamp 50 is removed from 8 and the button 40 is separated from the clamp 50, the annular leg portion 41 of the button 40 is sewn to the cloth W. This state is shown in FIG.

[0008]

As described above, according to the present invention, by improving the above-mentioned lock stitch sewing machine, the sewing of the back hole button sewing machine can be efficiently performed, and the work efficiency is greatly improved as compared with the conventional manual sewing machine. You can do it.

[Brief description of drawings]

FIG. 1 is a schematic diagram of a sewing machine head used in the present invention.

FIG. 2 is a partially enlarged perspective view in which a button and a button holding tool are attached to FIG.

FIG. 3 is a plan view of a needle plate.

FIG. 4 is a plan view showing the internal structure of the sewing machine excluding the top cover.

FIG. 5 is a perspective view showing the internal structure of the head of the sewing machine from which the cloth presser bar is removed.

FIG. 6 is a plan view of an embodiment of a cam according to the present invention.

FIG. 7 is a side view of a button gripping tool according to the present invention in which a button is clamped.

FIG. 8 is a front view of FIG.

FIG. 9 is a side view of a button gripping tool.

FIG. 10 is a rear view of FIG.

FIG. 11 is a perspective view of a button sewn on a cloth.

[Explanation of symbols]

 W Cloth 8 Sewing needle 10 Needle bar 11 Needle bar bush 12 Upper shaft 13 Bevel gear 16 Needle crank 22 Needle hole 24 Upper thread 25 Lower thread 26 Needle plate 28 Cloth holding bar 32 Pedestal 34 Needle hole 36 Button accommodating hole 40 Back hole button 41 annular leg 42 cam follower arm 44 follower arm bending part 50 button holding tool 52 front leg of bending part 54 rear leg of bending part 56 mounting hole 60 cam 61 cam shaft 62 mountain 63 valley 64 arcuate part

Claims (4)

[Claims] 1. A needle plate having a pair of legs for sandwiching a back-hole button, a back-hole button holder that is detachable from a cloth pressing rod, and a hole into which an end portion of the back-hole button can be inserted. And a pedestal that is provided on the throat plate, on which the back hole button is inserted into the hole, and when the lower leg button protruding from the back hole button can be placed, a rotatably rotatable shaft within the main body of the sewing machine. By rotating the cam that rotates by the bevel gear mechanism provided on the supported upper shaft and sliding on the cam, the needle bar with the sewing needle attached can be horizontally moved within the zigzag needle hole provided on the base for a predetermined distance. A lockstitch sewing machine with a back hole button and a cam follower arm. 2. The back hole button attaching book according to claim 1, wherein the length of one leg of the pair of leg portions of the back hole button clamp is formed to be substantially the same as the back hole button radius. Sewing machine. 3. The back hole button attachment according to claim 1 or 2, wherein the annular leg portion of the back hole button is attached to the cloth pressing rod so that the annular leg portion is positioned on the zigzag needle hole formed in the pedestal. Lockstitch sewing machine. 4. The lockstitch sewing machine with a back hole button, according to claim 1, 2 or 3, comprising a cam follower arm capable of pressing the curved portion against the bush of the needle bar to reciprocate the needle bar in the horizontal direction. .