JPS596792Y2 - Oil leakage prevention device for sewing machines - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a sealing device of a compound motion mechanism that slides and performs sliding motion in a cloth feeding device of a sewing machine or the like.

Sewing machines (sewing machines) are equipped with various complex movement mechanisms that slide and slide in addition to rotational movement, and these movement mechanisms need to be sufficiently lubricated in order to move smoothly.

Particularly in industrial sewing machines that operate at high speeds, even more complete lubrication is required. Therefore, a part of the movement mechanism is placed in an oil tank provided within the machine frame, and the lubricating oil in the oil tank is supplied by the operation of the movement mechanism. The oil is supplied to each moving part in the form of droplets to ensure sufficient lubrication.

However, sewing machines handle cloth as a workpiece, and contamination of the cloth with oil or the like is something that must be avoided as this will reduce the quality of the product.

In other words, there is a contradiction in that it is desirable to supply a sufficient amount of lubricating oil to the movement mechanism, and that even the slightest amount of lubricating oil must not adhere to the workpiece.

Therefore, a sealing material is used to prevent oil leakage so that lubricating oil does not seep into the portion of the movement mechanism that comes into contact with the workpiece.

However, if the moving member is one that performs a simple rotational motion or sliding motion, sealing is easy, but in the case of a feed table that requires multiple motions, it is not easy to prevent oil leakage.

In other words, the feed dog in a sewing machine must move in a loop-like trajectory, moving the sewing material horizontally in a predetermined direction, then descending, then horizontally moving in the opposite direction, and then rising. A compound movement consisting of a sliding movement and a rocking movement for vertical movement is performed, so the sealing method is extremely difficult, and the sealing condition of this part often causes oil leakage and stains the sewing material.

Various proposals have been made to prevent this drawback, but
Simply apply a sealant to the sewing machine body (machine frame),
Alternatively, it is not possible to obtain a sufficient oil leak prevention effect simply by making the sealing material movable, and if the sealing material is not installed properly, the sealing material may be squeezed due to sliding and rocking motion. It has the disadvantage that its durability deteriorates when it is exposed to stress or pressure.

In order to solve the above-mentioned drawbacks, the present invention essentially investigated the compound movement of sliding and rocking of the feed table, and as a result, the present invention is adapted to each movement by a method of sealing each movement, and the load on the sealing material can be easily reduced. It is an object of the present invention to provide an oil leakage device which reduces the amount of oil leakage and can be easily assembled and repaired.

The embodiments of the present invention will be explained below with reference to the drawings. Fig. 1 shows a side cross-section of the compound movement mechanism of the cloth feeding mechanism of the overlock sewing machine according to the present invention, and only the main parts of the machine frame 1 are shown. It is shaped like a box and lubricating oil can be stored at the bottom, and the cover plate 2 forms the floor of the machine.

The machine frame 1 rises from the side of the cover plate 2 to form an arm portion (not shown), and a needle bar mechanism and the like are disposed in the arm portion.

Reference numeral 3 denotes a compound movement member that constitutes a feed table, and is arranged in a box-shaped portion of the machine frame 1 and is driven by a drive shaft (not shown) located near the bottom via a crank machine frame or the like. It has become.

That is, a forked portion 31 is installed horizontally from the inside of the machine frame 1 to the outside of the machine frame 1', and has a forked portion 31 opened laterally at the lower side of one end as shown in the figure. 3
The end fork 31 is slidably fitted into a square piece 12 pivoted to a fixed shaft 11 at the rear inside the machine frame, and the lower fork 32 is connected from the drive shaft to the middle. A square piece 14 is fitted on an eccentric crankshaft 13 which is rotated through a mechanism, and horizontal movement ( The eccentric crankshaft 13 provides vertical movement (swinging).

The compound motion body 3 may be a single body, or may have a main and a sub-2 body.
There is also one that is arranged in parallel and fitted into the square piece 12 at the end to allow the main and sub horizontal movement speeds to be different.

In this embodiment, for convenience of explanation, it will be explained as an independent example.

Reference numeral 4 denotes a guide body made of sheet metal or the like in the shape shown in FIG.
1 is provided with a round hole 40 for pivoting, and the other end is provided with a guide port 41 for the compound movement body 3 bent and formed on the front side.
By inserting a stepped pin (not shown) into the fixed shaft 11 and fixing it to the fixed shaft 11, the center of motion is aligned with the part 3, and then the part 3 is inserted into the guide hole 41 to form the compound movement part 3. and the guide body 4 are pivoted together.

In addition, a presser foot 42 is provided at the upper part near the guide port 41 and protrudes inward.
A support piece 43 bent downward from the side surface is fixed to the side surface, and the support piece 43 and the presser foot 42 support the member 3 from above and below. ,
A clamping member 44, which has a protrusion on the right side and is made of Japanese oak or the like, is fitted between the guide body 4 and the member 3 by loosely fitting the protrusion into the groove of the guide member. The body 3 is configured to slide smoothly within the guide body 4 in the longitudinal direction.

The guide body 4 also serves as a cover to protect the compound motion unit body 3 from oil splashed within the machine frame. The lubricating oil is introduced to the moving member body 3 as a lubricant.

Reference numeral 5 denotes a seal holder, as shown in FIGS. 3 and 4, which is made of a material that is easy to mold, such as plastic, and has a square hole 50 in the center through which the composite part passes, and which facilitates assembly. A planar recess 51' is provided on the surface facing the inside of the frame to form a cavity 51 for fitting a sealing material when aligned with the surface of the fixing plate 6 described later, and a narrow groove 52 is cut with a constant width on the entire outer periphery. are provided, and protrusions 53. are provided from both sides in the direction of the recess 51' to hold the fixing plate 6 together and integrate it. 54 are provided.

The fixing plate 6 is formed of sheet metal, has a square window 60 in the center, has folding claws 61, 62 at the lower part for connecting to the guide hole 41 of the guide body 4, and has folding claws 61, 62 on both sides for connecting to the protrusions 53, 54. Notch 63. 64 are provided, and the claws 61 and 62 connect to the guide opening 41 of the guide body 4 as shown in the first figure.
It is integrated with the guide body 4 by being fitted into the lower part of the guide body 4.

Then, the holding body 5 is attached to the fixed plate 6 which is integrated with the guide body.
The protrusions 53 and 54 are cut out 63. 64, the hollow chamber 51 is formed in the recess 51', and the sliding direction sealing material 7 is fitted into the hollow chamber.

The sealing material 7 has a hole 70 in the center thereof through which the member 3 passes, and the hole 70 is tightly fitted to the outer periphery of the member 3 so as not to leak lubricating oil to the outside.

In this way, the guide body 4, the seal holder 5, and the fixing plate 6 are integrated, and the guide body 4 is attached to the seal holder 5 and the sealing material 7.
It is swayed with .

Numeral 8 is a sealing material for the swinging direction, which is made of a rubber material that is flexible and can withstand bending, etc., and has a square hole 80 in the center and mounting holes 81 in the four corners as shown in the third figure. ,
The square hole 80 is fitted into the outer circumferential groove 52 of the seal holder 5 with an appropriate clearance 52' in the vertical direction, as shown in the first figure, while applying a tensile force using its contractility. Even when the body 5 is swung and moves up and down, an unreasonable load is not applied to the sealing material 8, and a holding plate 9 as shown in FIG. Outside 1
’ is designed to be fixed with a screw.

A feed dog 30 is attached to the tip of the compound movement member 3 (feed stand) that protrudes outside through the seal holder 5.

The present invention is structured as described above, and the compound movement body 3 is supported within the machine frame 1 by the forks 31 and 32, and when the link 15 is moved by the drive mechanism, it slides in the horizontal direction,
When the crankshaft 13 rotates, it swings in the vertical direction,
It swings along with the guide body 4 and slides within the guide body 4.

As a result of the combined compound movements, the compound movement unit 3 gives the feed dog 30 a continuous loop movement of horizontal movement and vertical movement, as is well known, and conveys the sewing material placed on the feed dog 30.

Now, as described above, when the compound motion part body 3 moves, the sealing material disposed at the boundary between the inside and outside of the machine frame is subjected to a load due to sliding and rocking, causing the sealing material to be squeezed, compressed, or pulled. However, according to the present invention, the two sealing materials 7 and 8 separated according to purpose as described above are used and are properly attached to the holder 5, that is, the empty space 51 integrated with the guide body 4 is used. Oil leakage in the sliding direction is properly sealed without any rocking motion being applied to the sealing material 7 attached to the , and the seal 8 is smartly fixed from the outside by the mounting plate 9 against rocking motion. Since the seal holder 5 is fitted with enough room to move up and down, the holder 5 can be moved as shown in the first figure.
The inside and outside of the machine frame are completely partitioned by a seal 8 and a seal 8, and the movement of the compound movement member 3 is absorbed by the slack 52' of the groove 52 and the deflection of the sealing material 8, and the sealing in the swinging direction is also completely performed. It will be done.

As described above, according to the present invention, it rotates at high speed like an industrial sewing machine, and it is possible to completely seal no matter how much lubricating oil is scattered within the machine frame, and the sealing material can last a long time because the sealing method is easy. It is possible to provide a robust oil leakage prevention device, and the assembly work is simple because the two sealing materials tailored for different purposes are attached to the holder and assembled.
Therefore, it can be easily removed and repaired, and has extremely high functional and practical effects.

[Brief explanation of the drawing]

Figure 1 is an assembled sectional view of the oil leak prevention device of the present invention, Figures 2 and 3 are exploded perspective views of the main parts of the present invention, and Figure 4 is the
It is an elevational view taken in the direction of arrow C in the figure. 1 is the machine frame, 3 is the compound movement body (feeding stand), 4 is the guide body,
5 is a seal holder, and 7 is a first sealing material.

Claims (1)

[Scope of utility model registration request] In a sewing machine that is provided with a complex movement member that slides and swings while protruding from the inside of the machine to the outside, a seal holder 5 is provided for inserting the complex movement member into an internal square hole at an opening of the machine frame. A sealing material having a square hole shape, which is smartly fixed at the opening of the machine frame and has a clearance for vertical movement in the outer circumferential groove of the seal holder, is fitted coaxially with the compound movement member. A guide member is provided which is pivotally connected to the guide member and allows the compound movement member to be inserted into the guide port of the bent end portion, and the upper and lower parts are arranged in a cavity formed between the bending surface of the guide member and the seal holder. In a sewing machine, the sewing machine is provided with another sealing material which is movable and which is closely attached to the outer periphery of the compound movement part and is fitted and sewable so that the compound movement part can slide in the longitudinal direction. Oil leak prevention device.