JP3513688B2 - Interlock stitch machines with upper feed device - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a flat stitch sewing machine with an upper feed device, and more particularly, to a flat stitch sewing machine having an original lower feed tooth built in a sewing machine bed. The present invention relates to a flat stitch sewing machine with an upper feed device which is provided with an upper feed dog which operates synchronously with a lower feed dog and which feeds a sewing material in cooperation with the upper and lower feed dogs. 2. Description of the Related Art In a flat stitch sewing machine with an upper feed device of this type, an upper feed rod having an upper feed tooth attached to a lower end thereof slides up and down in a long hole formed in a bottom wall portion of a sewing machine arm. The lubricating oil supplied to the sewing machine arm to maintain the feed motion of the upper feed rod and the upper feed tooth smoothly is penetrated so as to be capable of swinging back and forth and projecting below the sewing machine arm. A link mechanism that swings the upper feed rod up and down and back and forth while leaking downward through the long hole, easily sewn the sewing cloth by the leaked oil, and running out of lubricating oil in the sewing machine arm. There is a problem that the operation of the rocking body that supports the intermediate portion of the above tends to become slippery. [0003] As means for preventing the leakage of lubricating oil which causes such a problem, there have conventionally been proposed (A), for example, Japanese Utility Model Publication No.
As disclosed in JP-A-14779 and JP-A-7-328258, a plate-like sealing member made of rubber or the like having a boot portion closely contacting the outer periphery of the upper feed rod and flexibly responding to the swing of the upper feed rod. And an oscillator that supports an intermediate portion of the upper feed rod, as shown in, for example, Japanese Utility Model Application Laid-Open No. 6-81471. Is rotatably held around a horizontal axis perpendicular to the cloth feeding direction in the thick portion of the bottom wall of the sewing machine arm, and the upper feed rod is inserted perpendicular to the horizontal axis. A bellows-shaped seal member is provided so as to surround the outer periphery of the upper feed rod portion between the bottom wall portion of the sewing machine arm and the outer peripheral surface portion of the upper feed rod above it at the upper position of the cylindrical bearing body. Along with
It is known that a plate-shaped seal member externally fitted to an upper feed rod is attached to a lower surface of a bottom wall portion of a sewing machine arm at a lower position of the cylindrical bearing body. [0004] However, in the conventional flat stitch sewing machine with the upper feed device employing the lubricating oil leakage prevention means having the structure as described in the above (A), it is formed on the bottom wall of the sewing machine arm. The elongated hole is closed by a plate-shaped sealing member abutting on the lower surface of the bottom wall portion,
Since the outer periphery of the feed rod is sealed by the flexible boot part, it is possible to sufficiently prevent dust such as lint generated during sewing from entering the sewing machine arm, but supply the dust to the sewing machine arm. Since the lubricating oil flowing down always flows down to the upper surface of the plate-like seal at the lower part of the long hole, the outer peripheral surface of the upper feed rod and the boot portion are caused by the complicated swinging motion of the upper feed rod. If a slight gap is formed therebetween, it is inevitable that the lubricating oil leaks downward along the outer peripheral surface of the upper feed rod through the gap. In a conventional flat stitch sewing machine with an upper feed device adopting the above-mentioned configuration (a), a bellows-shaped seal member is a cylindrical bearing member as an oscillating body that supports an intermediate portion of the upper feed rod. Although it has the function of properly supplying lubricating oil to the cylindrical bearing, it prevents the appropriate amount of lubricating oil supplied to the cylindrical bearing from leaking to the lower part of the sewing machine arm through the upper feed rod. , Which depends only on the plate-shaped sealing member mounted in contact with the lower surface of the bottom wall of the sewing machine arm. It is inevitable that the lubricating oil leaks downward along the outer peripheral surface of the upper feed rod through a small gap formed between the outer peripheral surface of the upper feed rod and the boot portion due to the swinging motion. Further, in any of the above configurations (A) and (A), the flexible boot portion is connected to the upper feed rod so that no gap is formed between the plate-shaped sealing member and the outer peripheral surface of the upper feed rod. If the strong contact force is brought into close contact with the outer peripheral surface of the upper feed rod, the strong contact force may cause resistance of the upper feed rod in vertical sliding and forward / backward swinging motions, which may hinder speeding up of the sewing machine. Therefore, the present invention has been made in view of the above circumstances, and can appropriately supply lubricating oil to each portion provided in a sewing machine arm for a feed motion of an upper feed dog. While not hindering the speeding up of the sewing machine, it is possible to reliably prevent both the leakage of lubricating oil and the intrusion of dust inside , and to promote the speeding up of the sewing machine.
It is a purpose to provide an upper feed device with flat stitch sewing machine is Ru can. [0008] To achieve the above object, resolving means for the problems], device with flat stitch sewing machine feed on Ru engaged to the invention,
A oscillating body disposed in the sewing machine arm and swingably provided about a horizontal axis orthogonal to the cloth feeding direction, and an intermediate portion thereof supported by the oscillating body, formed on a bottom wall of the sewing machine arm; The upper feed rod protruding downward from the bottom wall of the sewing machine arm and the lower feed dog built in the sewing machine bed are pierced through the elongated hole slidably up and down and swingable back and forth. An upper feed dog attached to a lower end of the upper feed bar, and an upper feed tooth provided in the sewing machine arm, and connected to an upper portion of the upper feed bar so as to make the upper feed tooth perform an elliptical motion along a fabric feeding direction. In a flat stitch sewing machine provided with an upper feed device comprising a front-rear swing mechanism and a vertical swing mechanism, the swing body is provided at a side of the upper feed rod.
A fulcrum ring that can swing around the horizontal axis provided in the
At the tip of this fulcrum link
The intervening portion is connected and supported , and the upper surface of the bottom wall of the sewing machine arm and the upper portion thereof and the fulcrum ring are supported.
A first sealing member on the feed bellows which is provided so as to surround the outer periphery of the rod portion between the outer peripheral surface of the lower portion of the upper feed rod than the support portion of the upper feed rod by click, the slots A plate-shaped second seal member having a size to be closed, and being provided only to slide back and forth along the lower surface of the bottom wall of the sewing machine arm in conjunction with the forward and backward swing of the upper feed rod; It is characterized by having. According to inventions having the above configuration, by the actuation of the sewing machine, the front and rear while sliding upper feed rod in the vertical direction via the longitudinal rocking mechanism and the vertical swinging mechanism provided in the sewing machine arm The swinging body supporting the intermediate portion of the upper feed rod swings about a horizontal axis perpendicular to the cloth feeding direction, and the lower end of the upper feed rod is made synergistically by these swing operations. The upper feed dog attached to the portion performs an elliptical motion along the horizontal cloth feed direction, and cooperates with the lower feed dog opposed thereto to feed the cloth in a predetermined direction. Here, a bellows-shaped first seal is provided above the elongated hole formed in the bottom wall portion of the sewing machine arm so that the upper feed rod penetrates, and below the supporting portion of the upper feed rod by the oscillator. Since the member and the plate-shaped second seal member are provided at the lower part of the long hole, for the above-mentioned front-rear swing mechanism, vertical swing mechanism, and swing body incorporated in the sewing machine arm, The lubricating oil supplied into the sewing machine arm is supplied appropriately and sufficiently to keep the above-mentioned upper feed operation smoothly, and at the same time, the lubricating oil leaks to the lower portion of the sewing machine arm through the long hole. The heavy sealing member can reliably prevent the dust generated below the bottom wall of the sewing machine arm from entering the sewing machine arm through the long hole by the second sealing member. be able to. Further, the as oscillator, using a swingable fulcrum link to the horizontal axis around which is provided in the sewing machine arm side of the upper feed rod, above the tip of the fulcrum link (oscillator) A configuration is adopted in which the intermediate part of the upper feed rod is connected and supported.
Since the use, for Lash during vertical sliding and longitudinal rocking of the upper feed rod resistance is eliminated, it is possible to promote <br/> the speed of the sewing machine. Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a partially cutaway front view of a sewing machine arm showing a main part of a flat stitch sewing machine with an upper feed device according to the present invention. FIG. 2 is a side view of FIG. A needle bar 3 having a sewing needle 2 at a portion thereof is supported so as to be able to move up and down.
It is driven by an upper shaft crank (not shown) which is horizontally suspended in the inside. Behind the needle bar 3, a presser shaft 5 having a presser 4 attached to its lower end is provided.
The cloth on the needle plate 6 attached to the sewing machine bed is pressed from above by a built-in spring (not shown). Since these configurations are the same as known flat stitch sewing machines,
Detailed description is omitted. 1 and 2, reference numeral 7 denotes an upper feed rod.
The lower part 7A is vertically connected to a long hole 9 formed in the bottom wall part 8A of the extended sewing machine arm part 8 which is fixedly connected to the front part of the bottom wall part 1A of the sewing machine arm 1 and locally extends downward. It penetrates so as to be slidable and swingable back and forth and protrudes below the extended sewing machine arm 8. The inside of the extended sewing machine arm portion 8 communicates with the inside of the upper sewing machine arm 1,
A guide pin 11 provided on the rear side of the upper feed rod 7 in the extended sewing machine arm portion 8 can swing around a horizontal axis a.
The intermediate portion of the upper feed rod 7 is connected and supported at the tip of a fulcrum link 12 serving as an oscillating body via a link pin 13.
An upper feed dog 14 is fixed to a lower end portion of the upper feed rod 7. The upper feed tooth 14 is opposed to the upper feed tooth 14 and is built in the sewing machine bed and protrudes above the needle plate 6 so as to be elliptical in the front-rear direction. The moving lower feed dog 15 is used to feed the cloth in a predetermined direction by sandwiching the cloth from above and below. In the sewing machine arm 1, the upper feed rod 7 is vertically moved via an upper feed vertical shaft and an upper feed front / rear shaft which are supported in parallel with each other in conjunction with the upper shaft crank (not shown). An up-down swing mechanism and a back-and-forth swing mechanism for swinging in the front-rear direction while sliding on the upper feed rod 7 are provided. Fulcrum link 1 supporting the middle part of
The upper feed dog 14 is made to move in an elliptical manner along the cloth feed direction by synergistic with the swing around the horizontal axis a of the lower feed dog 1.
5, the fabric is fed in a predetermined direction. Note that the upper feed vertical shaft, the upper feed front-rear shaft, the vertical swing mechanism, and the front-rear swing mechanism are not shown because they are well known. In the above-structured flat stitch sewing machine with an upper feed device, the lower wall 7A of the upper feed rod 7 is projected below the extended sewing arm 8 so that the bottom wall of the extended sewing arm 8 is formed. A first seal member 16 and a second seal member 17 as described below are provided above and below the long hole 9 formed in the portion 8A. That is, as shown in FIGS. 3 and 4, an annular seal support 18 surrounding the upper feed rod 7 is fixed to the upper surface of the bottom wall 8A of the extended sewing machine arm 8, An annular groove 18a formed on the outer peripheral surface of the seal support 18 and an upper portion thereof are formed on the outer peripheral surface of the upper feed bar 7 below the connection support portion of the upper feed bar 7 by the fulcrum link 12. By fitting the upper and lower ends thereof into the annular concave groove 7a, a first seal member 16 made of a rubber bellows-like cover surrounding the outer periphery of the feed rod 7 is formed. On the lower surface of the bottom wall portion 8A of the extended sewing machine arm portion 8, a plate-like shape having a size larger than the elongated hole 9 in both lateral width and front-rear length so as to close the elongated hole 9 is provided. The second seal member 17 is in contact. This plate-shaped second
The seal member 17 is a plate-shaped seal support 20 fixed to the bottom wall 8A of the extended sewing machine arm 8 together with the seal support 18 for the first seal member 16 via a bolt 19 in contact with the lower surface thereof. The position is regulated by a pair of left and right spacers 21 and 21 which are arranged on the left and right sides thereof and are fixedly held between the plate-shaped seal support 20 and the bottom wall 8A of the extended sewing machine arm 8. Interlocking with the forward and backward swing of the feed rod 7, the extension sewing machine arm 8 is configured such that it can only slide back and forth along the lower surface of the bottom wall 8A. Next, the operation of the above-structured flat stitch sewing machine with an upper feed device will be briefly described. With the operation of the sewing machine, the upper feed rod 7 swings in the front-rear direction while sliding in the vertical direction via the front-rear swing mechanism and the vertical swing mechanism provided in the sewing machine arm 1. The fulcrum link 12 supporting the intermediate portion of the rod 7 swings around the horizontal axis a of the guide pin 11, and the upper feed dog attached to the lower end of the upper feed rod 7 by a synergistic operation of these swing operations. 14
Moves in an elliptical manner along the dough feeding direction, and cooperates with the lower feed dog 15 to feed the dough in a predetermined direction. In the flat stitch sewing machine with an upper feed device for performing the above-described cloth feeding operation, an elongated hole 9 formed in the bottom wall portion 8A of the extending sewing machine arm portion 8 so that the upper feed rod 7 penetrates. Above and below, the first seal member 16 made of a rubber bellows-like cover and the upper and lower feed rods 7 move back and forth along the lower surface of the bottom wall 8A of the extending sewing machine arm 8 in conjunction with the forward and backward swinging movement. Is provided with a plate-shaped second seal member 17 which slides on the sewing machine arm 1 so that the front-rear swing mechanism and the vertical swing mechanism incorporated in the sewing machine arm 1 and the extension communicating with the sewing machine arm 1 are further provided. The lubricating oil supplied in the sewing machine arm 1 is adequately and sufficiently supplied to the guide pins 11 constituting the swinging horizontal axis a of the fulcrum link 12 incorporated in the sewing machine arm portion 8 and the cloth While always keeping the feed operation smooth, The upper and lower double seal members 16 and 17 can reliably prevent the lubricating oil from leaking to the lower portion of the extending sewing machine arm portion 8 through the elongated hole 9 and contaminating the sewn cloth. It is ensured by the second seal member 17 that dust such as lint generated under the bottom wall portion 8A of the extending sewing machine arm 8 sometimes enters the extending sewing machine arm 8 through the elongated hole 9. Can be prevented. [0018] Also, as the oscillator for supporting the middle portion of the upper feed rod 7, the fulcrum link 12 to swing in the horizontal axis a about a guide pin 11 provided on the rear side of the upper feed rod 7
Because it uses a for Lash during vertical sliding and longitudinal rocking of the upper feed rod 7 resistance is eliminated, it is possible to accelerate the speed of the sewing machine I cooperation with the holding of the above-mentioned lubrication properties . As described above, according to the present invention, the outer periphery of the upper feed rod is positioned vertically above and below the long hole formed in the bottom wall of the sewing machine arm so that the upper feed rod penetrates. Is provided with a bellows-shaped first seal member surrounding the first seal member and a plate-shaped second seal member that can only slide back and forth along the lower surface of the bottom wall of the sewing machine arm. The back and forth swing mechanism, the up and down swing mechanism, and the fulcrum link for supporting the intermediate portion incorporated in the sewing machine arm so as to make the upper feed rod move in an elliptical manner along the fabric feeding direction are provided in the sewing machine arm. Supplying the lubricating oil being supplied properly and sufficiently to keep the up-feed operation smooth, and at the same time, the lubricating oil leaks to the lower portion of the sewing machine arm through the long hole to contaminate the cloth; and Dust generated below the bottom wall of the Thus, it is possible to reliably prevent the intrusion into the sewing machine arm. Further, a bellows-shaped first seal member for preventing oil leakage and a plate-shaped second seal member for preventing dust intrusion are separately provided, and both seal members are formed in a bellows-like shape and a sliding plate shape. As a form suitable for oil and dust proofing and without resistance to the movement of the upper feed rod, it is easy to cope with speeding-up of the sewing machine in conjunction with maintaining the lubrication performance of each operating part. as possible out is possible to reliably achieve the performance and dust-proof performance. Further, as an oscillating body, a side end of the upper feed rod is
A support that can swing around the horizontal axis provided in the thin arm.
Using a point link, connect the middle of the upper feed rod
The upper feed dog keeps the axis of the elliptical motion trajectory horizontal, improving the efficiency of fabric feeding, and eliminating the drag when the upper feed rod slides up and down and swings back and forth. This has the effect that the speeding up can be further promoted.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a partially cutaway front view of a sewing machine arm showing a configuration of a main part of a flat stitch sewing machine with an upper feed device according to the present invention. FIG. 2 is a side view of FIG. FIG. 3 is an enlarged side view of a main part. FIG. 4 is an enlarged vertical sectional front view of a main part corresponding to FIG. 3 ; [EXPLANATION OF SYMBOLS] 1 machine arm 1A machine arm of the bottom wall portion 7 on the feed rod 8 extending machine arm portions 8A extended machine arm portion of the bottom wall portion 9 slot 12 the fulcrum link (swinging member) 14 upper feed dog 15 Lower feed dog 16 Bellows-shaped first seal member 17 Plate-shaped second seal member a Horizontal axis

Claims (1)

(57) [Claims 1] An oscillating body disposed in a sewing machine arm and swingably provided around a horizontal axis perpendicular to a cloth feeding direction, and an intermediate portion between the oscillating body and the oscillating body. And an upper feed rod whose lower part projects downwardly and slidably through a long hole formed in the bottom wall of the sewing machine arm so as to be able to swing back and forth. An upper feed dog attached to a lower end of the upper feed rod facing a lower feed dog built in the sewing machine bed; and an upper feed dog provided in the sewing machine arm, and the upper feed tooth is elliptical along the cloth feed direction. in upper feed device with flat stitch sewing machine comprising a the upper longitudinal swinging mechanism coupled to the top of the feed rod and the vertical swing mechanism so as to exercise, the swinging
The moving body is provided in the sewing machine arm on the side of the upper feed rod.
Fulcrum links that can swing about the horizontal axis
The middle part of the upper feed rod is connected and supported at the tip of the fulcrum link
And at the top of the bottom wall of the sewing machine arm and above it,
And a bellows-shaped first seal member provided so as to surround the outer periphery of the upper feed rod portion between the support portion of the upper feed rod and the outer peripheral surface portion of the upper feed rod below the fulcrum link ; A plate-shaped second member having a size to close the long hole, and provided only slidably back and forth along the lower surface of the bottom wall of the sewing machine arm in conjunction with forward and backward swinging of the upper feed rod. A flat stitch sewing machine with an upper feed device, comprising a sealing member .