JP2003038884A - Lock stitch sewing machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a lock stitch sewing machine that can be downsized and made inexpensive. SOLUTION: A worm 85 for driving an oil pump is integrally formed in a feed cam mechanism 60 arranged on the base end side BS of the main shaft 31 of a sewing machine, connecting the sewing machine's main shaft 31 and a feed driving shaft 61 and regulating the amount of driving of the driving shaft 61 with respect to the main shaft 31.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a lock sewing machine capable of performing double chain stitch and overlock stitch,
In particular, the present invention relates to a lock sewing machine that can be easily downsized.

[0002]

2. Description of the Related Art Conventionally, as a kind of industrial sewing machine,
A lock sewing machine that performs high-speed double chain stitching and overedging is known.

In such a lock sewing machine, a coupling mechanism for transmitting the driving force of the sewing machine main shaft to each drive shaft such as a needle drive shaft, a feed drive shaft, an upper looper drive shaft and a lower looper drive shaft, and from each drive shaft. At least one of the components represented by a needle mechanism that transmits the output driving force to the needle bar, a feed mechanism that transmits to the feed dog, an upper looper mechanism that transmits to the upper looper, etc. is made movable. Sliding parts that are supported so that one part is in contact with the other part are provided everywhere.

The sliding portion of such a conventional lock sewing machine generates abrasion powder due to abrasion of the sliding portion and sliding resistance (friction resistance) at the sliding portion due to high-speed operation of the sewing machine.
It is known that heat generation causes heat generation, and this heat generation causes seizure damage and the like.

Therefore, in order to prevent the generation of abrasion powder and the seizure damage due to the abrasion of the sliding portion, in the conventional lock sewing machine, an oil pan is provided under the sewing machine frame to obtain, for example, a kinematic viscosity. 5-25cSt
By storing lubricating oil with a low viscosity of a certain degree and forcibly supplying the stored lubricating oil to the sliding parts using an oil pump driven by the driving force of the sewing machine spindle, abrasion powder is generated and seizure damage is caused. A lubrication film was formed to prevent the occurrence of the above.

[0006]

By the way, in recent years, miniaturization and cost reduction have been demanded in various devices, and miniaturization and cost reduction have also been demanded in lock sewing machines.

The present invention has been made in view of this point, and an object of the present invention is to provide a lock sewing machine which can be reduced in size and cost.

[0008]

In order to achieve the above-mentioned object, the feature of the lock sewing machine of the present invention according to claim 1 is that the lock sewing machine is arranged on the base end side of the sewing machine spindle. It has a feed cam mechanism that connects the feed drive shaft and adjusts the drive amount of the feed drive shaft with respect to the sewing machine main shaft, and a worm that is integrally formed with the feed cam mechanism and that drives the oil pump. . Further, by adopting such a configuration, the worm is integrally formed with the feed cam mechanism, so that downsizing and cost reduction can be easily achieved.

A lock sewing machine according to a second aspect of the present invention is characterized in that, in the first aspect, the worm is provided at a portion of the feed cam mechanism that integrally rotates concentrically with the sewing machine main shaft. . By adopting such a configuration, the worm can be reliably integrated with the feed cam mechanism.

[0010]

DETAILED DESCRIPTION OF THE INVENTION The present invention will be described below with reference to the embodiments shown in the drawings.

As shown in FIGS. 1 and 2, in the lock sewing machine 1 of this embodiment, an oil pan 3 is arranged below a sewing machine frame 2. An upper portion of the oil pan 3 is opened, and a low-viscosity lubricating oil having a kinematic viscosity of about 5 to 25 cSt for oil lubrication of a sliding portion is stored in a lower portion inside the oil pan 3. And oil pan 3
An oil pump (not shown) for supplying lubricating oil to the sliding portion is provided on the right side of FIG. In this lock sewing machine 1, the diagonally lower right side in FIG. 1 is a front side FS which is an operating side facing an operator who performs various operations and works, and the diagonally upper left side in FIG. 1 is opposite to the front side FS. It is the rear side RS located. The right side of the lock sewing machine 1 when viewed from the front side FS is the base end side BS on which the drive mechanism of the lock sewing machine 1 is arranged.
The left side when viewed from the front side FS is a tip side TS on which a sewing product such as cloth is sewn.

The structure of the sewing machine frame 2 of this embodiment will be described in detail with reference to FIGS.

The sewing machine frame 2 of the lock sewing machine 1 according to the present embodiment has a base portion 2A arranged on the base end side BS on the right side when viewed from the front side FS, and extends from the lower left part of the base portion 2A toward the tip side TS. The taken out cloth base receiving portion 2B and the tip side TS from the upper left side of the base portion 2A in parallel with the cloth base receiving portion 2B.
It has a head portion 2C extending toward and is formed in a substantially inverted U-shape on the front as a whole. The sewing machine frame 2 is generally integrally formed by casting or the like. Further, the sewing machine frame 2 includes a front wall 2FW arranged on the front side FS, a rear wall 2RW arranged on the rear side RS, and a base wall 2BW arranged on the base side BS.
And an intermediate wall 2MW arranged at the boundary between the base 2A and the cloth receiving portion 2B, and a tip wall 2T arranged on the tip side TS.
Have W and.

The front wall 2FW has a high base front wall 2FWA arranged on the base 2A, and the cloth receiving portion 2
It is formed in a substantially inverted L shape when viewed from the front side FS by the cloth table receiving portion front wall 2FWB which is arranged at B and whose height is about half of the base front wall 2FWA. Further, the rear wall 2RW is similar to the front wall 2FW in that the base rear wall 2RWA having a high height arranged on the base 2A and the base rear wall 2RW arranged on the cloth bed receiving portion 2B have almost the same height as the base rear wall 2RWA. It is formed in a substantially inverted L shape when viewed from the front side FS, by the cloth receiving portion back wall 2RWB which is approximately half.
Furthermore, the base end wall 2BW and the intermediate wall 2MW are formed in a rectangular shape whose side faces are substantially vertically long, and the height of the tip end wall 2TW is about half the height of the base end wall 2BW and the intermediate wall 2MW. It is formed in a substantially horizontally long rectangular shape. Furthermore, the base front wall 2FWA, the base rear wall 2RWA,
The base end wall 2BW and the intermediate wall 2MW are formed to have the same height, and the cloth table receiving portion front wall 2FWB, the cloth table receiving portion rear wall 2RWB, and the tip wall 2TW are formed to have the same height. ing.

That is, the base 2A is the front wall 2FW of the base.
A, base rear wall 2RWA, base wall 2BW and intermediate wall 2
The four side surfaces are surrounded by the MW, and the inside thereof is formed into a substantially rectangular tube shape that penetrates in the vertical direction.
Is the front wall 2FB of the cloth receiving part, the rear wall 2R of the cloth receiving part
The four side surfaces are surrounded by the WB, the intermediate wall 2MW, and the front end wall 2TW, and the inside thereof is formed into a substantially rectangular tube shape that vertically penetrates. In addition, the upper surface of the base 2A, the base 2A
An upper frame cover 4 shown in FIGS. 1 and 2 is arranged so as to close the opening at the top of the frame.

At the center between the base wall 2BW and the intermediate wall 2MW, a substantially flat plate-shaped first support wall 2S extending parallel to the base wall 2BW and the intermediate wall 2MW, respectively.
Wa is arranged. The side surface of the first support wall 2SWa located on the front side FS is connected to the inner surface of the front wall 2FW, and the side surface of the first support wall 2SWa located on the back surface RS is connected to the inner surface of the back wall 2RW. . Also, the first
The support wall 2SWa, as shown in detail in FIG.
Seen from the lower left corner, that is, the first support wall 2SWa
The portion located on the rear surface side RS is approximately half the length in the front-rear direction, and is cut into a substantially rectangular side surface to a height position substantially the same as the height position of the cloth bed receiving portion 2B to form the communication hole 11 in the base portion. It is formed so that the internal space of the base portion 2A located on the left and right of the first support wall 2SWa is in communication with each other.

Further, the lower part of the intermediate wall 2MW has a tip side TS.
Seen from the lower right corner, that is, the front side FS of the intermediate wall 2MW
The portion located at is approximately half the length in the front-rear direction, and is cut into a substantially rectangular side surface to form a square communication hole 12 (FIG. 8) over a height that is approximately half the height of the cloth receiving portion 2B. On the surface of the square communication hole 12 located on the front side FS, a second plate-shaped second plate extending in the left-right direction is formed at a substantially central position between the front wall 2FW and the rear wall 2RW.
The support wall 2SWb is connected to a substantially central portion in the longitudinal direction.

The height of the portion of the second support wall 2SWb on the right side of the intermediate wall 2MW, that is, the portion located inside the base 2A is substantially the same as the height of the communication hole 11 in the base formed in the first support wall 2SWa. It is said that this second support wall 2
The right end surface of SWb is connected to the formation site of the intra-base communication hole 11 on the left side surface of the first support wall 2SWa. Also, the second
The height of the left side of the intermediate wall 2MW of the support wall 2SWb, that is, the position of the portion located inside the cloth base receiving portion 2B is about half the height of the cloth base receiving portion 2B.
The left end portion of SWb extends to a position that is approximately half the length of the cloth receiving portion 2B in the left-right direction. And the second
The left end portion of the support wall 2SWb is connected to the side surface located on the back side RS of the substantially flat plate-shaped third support wall 2SWc arranged in parallel with the tip wall 2TW.
The front side located on the front side FS of c is the cloth receiving part front wall 2
It is connected to the inner surface of the FWB.

As a result, on the front side FS of the second support wall 2SWb, the base portion 2A located on the right side of the intermediate wall 2MW.
The base internal space 2Aa and the cloth receiving part internal space 2Ba of the cloth receiving part 2B located on the left side of the intermediate wall 2MW are communicated with each other.

That is, the inner space 2Ba of the cloth table receiving portion is
Above the second support wall 2SWb and the third support wall 2SWc, a substantially rectangular shape in a plane in which four sides are surrounded by the cloth bed receiving portion front wall 2FWB, the cloth bed receiving portion rear wall 2RWB, the intermediate wall 2MW, and the tip wall 2TW. Formed on the second
In the formation portion of the support wall 2SWb and the third support wall 2SWc, the second support wall 2SWb and the third support wall 2SWc
It is divided into two at the border.

Further, the cloth receiving surface 2FWB of the cloth receiving portion 2B, the upper end of the third supporting wall 2SWc, the upper end of the second supporting wall 2SWb, and the intermediate wall 2MW are connected to form a rectangular plane shape. The partition plate 13 in the form of a flat plate is arranged such that the thickness direction thereof is the vertical direction, and the first cloth table receiving part internal space 2Baa located below the partition plate 13 in the cloth table receiving part internal space 2Ba. Only the base 2A is communicated with the base internal space 2Aa. That is, as shown in FIG. 8, the partition plate 13 includes the first cloth bed receiving portion internal space 2 that connects the cloth bed receiving portion internal space 2Ba of the cloth bed receiving portion 2B to the base portion 2A.
It has a function of a partition that divides into two, a Baa and a second cloth base receiving portion internal space 2Bab that is cut off from the base internal space 2Aa of the base portion 2A.

Furthermore, the cloth-board receiving portion front wall 2FWB, the front-end wall 2TW, and the cloth-bed receiving portion rear wall 2R of the cloth-bed receiving portion 2B.
A flat plate-shaped bottom plate 14 formed in a substantially inverted L shape so as to connect the lower ends of the WB, the intermediate wall 2MW, the second support wall 2SWb, and the third support wall 2SWc to each other vertically in the thickness direction. Are arranged. That is,
The second cloth receiving part internal space 2Bab of the cloth receiving part 2B located above the bottom plate 14 is cut off from the base internal space 2Aa of the base 2A by the partition plate 13, and is cut off from the internal space of the oil pan 3 by the bottom plate 14. It is supposed to be done.

The base internal space 2Aa of the base 2A and the first cloth tray receiving portion internal space 2Baa of the cloth tray receiving portion 2B which communicates with the base internal space 2Aa constitute the connecting mechanism accommodating portion 16 of this embodiment. The second fabric tray receiving portion internal space 2Bab of the fabric tray receiving portion 2B constitutes the feed mechanism housing portion 17 of the present embodiment.

Therefore, the partition plate 13 has a function of disconnecting the connection mechanism housing portion 16 and the feed mechanism housing portion 17 of the present embodiment.

On the upper part of the left side surface of the intermediate wall 2MW, a head frame-shaped wall 2CW for forming a head 2C is provided on the tip side T.
The head-shaped frame-shaped wall 2 is formed so as to extend toward S.
The head internal space 2Ca surrounded by the CW constitutes the needle mechanism accommodating portion 18 of the present embodiment. A head cover 19 shown in FIGS. 1 and 2 is provided on the head 2C so as to close the opening of the head frame-shaped wall 2CW.

As shown in FIG. 3, an upper looper projection wall 2FPW formed in a substantially frame shape extends toward the front side FS at the lower part of the center of the outer surface of the front wall 2FW in the left-right direction. It is formed and this upper looper protruding wall 2FP
The opening of W is covered by the right side portion of the looper lid 20a. And the protruding wall 2 for the upper looper
2FPW internal space for upper looper surrounded by FPW
The upper looper mechanism storage portion 21 of this embodiment is constituted by a. Further, a looper cover 20b is arranged on the front side of the looper lid 20a, and is configured so that it can be moved in the left-right direction and opened / closed.

On the left side of the outer wall of the front wall 2FW where the upper looper projection wall 2FPW is formed, an outer projection wall 2FOW is formed extending toward the front side FS.
The opening of the outer protruding wall 2FOW has the looper lid 20.
It is adapted to be covered by a cloth pedestal cover 22 arranged on the left side portion of a and the front end side TS of the cloth pedestal receiving portion 2B. The lower looper / double ring mechanism housing portion 23 is configured by the left side portion of the looper lid 20a on the outer surface of the front wall 2FW and the outer internal space 2FOWa covered by the cloth pedestal cover 22.

As shown in FIGS. 1 and 2, on the upper surface of the cloth receiving base cover 22 and the cloth receiving base 2B of the sewing machine frame 2 arranged at the left end of the cloth receiving base 2B, as shown in FIGS.
A cloth placing plate 24 is provided on which a sewing product such as cloth is placed when the sewing operation is performed.

Next, the structure of the essential parts of the lock sewing machine 1 of this embodiment will be described with reference to FIGS. 1 to 13.

On the front side FS inside the lower portion of the sewing machine frame 2 of the lock sewing machine 1 of the present embodiment, as shown in FIGS. 9 and 10, a sewing machine main shaft 31 extending in the horizontal direction is provided. This sewing machine main shaft 31 is used for the sewing machine frame 2
2A and cloth receiving part 2B, specifically, the base end wall 2B
W, first support wall 2SWa, intermediate wall 2MW, and tip wall 2
For the first spindle retained in the first spindle support hole 32A, the second spindle support hole 32B, the third spindle support hole 32C, and the fourth spindle support hole 32D, which are formed so as to pass through the TW coaxially. Bearing 33A, bearing 33B for the second main shaft,
It is rotatably supported by the third main shaft bearing 33C and the fourth main shaft bearing 33D. Note that the first main spindle bearing 33A, the second main spindle bearing 33B, and the fourth main spindle bearing 33A in the present embodiment.
A rolling bearing is used as the main shaft bearing 33D, and a C metal (sliding bearing) is used as the third main shaft bearing 33C. In addition, the first spindle bearing 33A
Is a flanged housing 3 as shown in detail in FIG.
It is mounted in the first main shaft support hole 32A via 4 and between the first main shaft bearing 33A and the flange-shaped housing 34 and between the flange-shaped housing 34 and the first main shaft support hole 32A. O-ring 35 as a sealing device
Are arranged respectively. By using the flange-shaped housing 34, the inner diameter of the first spindle support hole 32A formed in the base end wall 2BW is made larger than the maximum outer diameter of the sewing machine spindle 31, and the sewing machine spindle 31 is mounted inside the sewing machine frame 2. You can improve your sex.

As shown in detail in FIG. 11, a second bearing mounting portion 36B on which the second spindle bearing 33B of the sewing machine spindle 31 is mounted and a third bearing mounting portion 36C on which the third spindle bearing 33C is mounted. The portion located between and is a crankshaft on which four drum-shaped crankpins 37A, 37B, 37C, 37D are arranged, and as shown in FIG. 9, the crankpin 37A on the base end side BS. The upper looper drive connecting rod 41, the crank pin 37B a female drive connecting rod 42, the crank pin 37C a needle drive connecting rod 43, and the crank pin 37D a lower looper drive connecting rod 44. The ends are fitted. Then, as shown in FIG. 9, the upper looper drive connecting rod 4
The other end of the upper looper drive link 47, one end of which is connected to the upper looper drive shaft 46, is connected to the front end portion of 1.
Further, the other end of a knife driving link 49, one end of which is connected to the knife driving shaft 48, is connected to the tip of the knife driving connecting rod 42. Furthermore, the other end of a needle drive link 51, one end of which is connected to the needle drive shaft 50, is connected to the tip of the needle drive connecting rod 43. Furthermore, the other end of a lower looper drive link 53, one end of which is connected to the lower looper drive shaft 52, is connected to the tip portion of the lower looper drive connecting rod 44.

Bearing 33 for the first spindle of the sewing machine spindle 31
Between the first bearing mounting portion 36A on which A is mounted and the second bearing mounting portion 36B on which the second main shaft bearing 33B is mounted, there is a feed cam mechanism arrangement portion 56 that constitutes a part of the feed mechanism. The feed cam mechanism arranging portion 56 is provided with a feed cam mechanism 60 shown in FIG. The feed cam mechanism 60 is for connecting the sewing machine main shaft 31 and a feed drive shaft 61 extending parallel to the sewing machine main shaft 31 and adjusting the drive amount of the feed drive shaft 61 with respect to the sewing machine main shaft 31. As shown in FIG. 12, it has a ratchet gear 62 fixed to the base end side of the sewing machine main shaft 31 by two ratchet screws 62a and 62b.
A ratchet 65, which is pressed by a spring 64 and meshes with the ratchet gear 62, is provided on the left side of the ratchet gear 62 located on the tip side TS so as to be movable in a direction orthogonal to the longitudinal direction of the sewing machine main shaft 31. There is.

A feed adjusting cam 66 to be inserted into the sewing machine main shaft 31 is disposed on the left side of the ratchet 65, and the ratchet 6 is provided on the right end surface of the feed adjusting cam 66.
A pair of ratchet slide surfaces 66a with which the slide surface 65a of No. 5 is slidably engaged is formed. Also,
The feed adjusting cam 66 is formed with two pin through holes 66b into which a pair of stopper pins 67 are mounted, and a spring through hole 66c into which one end of the spring 64 is inserted.

An eccentric cam portion 66d is formed at the left end of the feed adjusting cam 66, and the eccentric cam portion 66d is formed.
A square piece 68 is externally attached to the. The inner peripheral surface of the feed cam 69 is engaged with the outer periphery of the square piece 68, and the pair of feed cam slide surfaces 68 a formed on the outer peripheral surface of the square piece 68 and the inner portion of the feed cam 69. A pair of corner piece slide surfaces 69a formed on the peripheral surface are slidably fitted along the axial direction of the sewing machine main shaft 31. Further, a pair of support base engaging portions 69b is formed at the left end of the feed cam 69, and the support base engaging portions 69b are fixed to the sewing machine main shaft 31 by two support base fixing screws 70. The engaged portion 71a of the support base 71 is engaged.

A cam portion 69 is provided at the right end of the feed cam 69.
c is formed, and the base end portion of the feed drive connecting rod 73 is attached to the cam portion 69c via the bearing 72. The inner diameter of the feed drive connecting rod 73 is formed to be larger than the maximum outer diameter of the sewing machine main shaft 31, and the feed drive connecting rod 7 is provided inside the sewing machine frame 2.
The sewing machine main shaft 31 can be inserted into the sewing machine frame 2 with the sewing machine 3 arranged, and the feed drive connecting rod 73 can be easily assembled to the sewing machine main shaft 31. Further, at the tip of the feed drive connecting rod 73,
A support pin 76, which is rotatably supported by a feed fork crank 75 fixed to the feed drive shaft 61 by a fork set screw 74, is fixed by a support pin set screw 77. Further, the feed cam mechanism 6 is provided on the outer periphery of the ratchet 65.
A concave portion 65b is formed in which the operating end 78a of the feed adjusting button 78 for adjusting the drive amount of the feed drive shaft 61 by 0 is contacted and separated. FIG. 13 shows the actual arrangement of parts of the main parts of the feed cam mechanism 60 as viewed from the base end side BS.

Therefore, the lock sewing machine 1 of this embodiment is
9, a coupling mechanism for transmitting the driving force of the sewing machine main shaft 31 to at least the needle drive shaft 50, the feed drive shaft 61, the upper looper drive shaft 46 and the lower looper drive shaft 52, specifically, the needle drive Connecting rod 43, needle drive link 51, upper looper drive connecting rod 41, upper looper drive link 47, lower looper drive connecting rod 44 and lower looper drive link 53, and a conventionally known main feed swing rod. 98, a feed cam mechanism 60 that constitutes a part of the feed mechanism 105 such as the auxiliary feed swing rod 99, etc. are housed inside the coupling mechanism housing portion 16 of the sewing machine frame 2.

As shown in FIGS. 1 and 2, the feed adjusting button 78 is arranged below the front side FS facing the operator of the sewing machine frame 2. For details, see Figure 1.
As shown in 0, the base front wall 2FW of the sewing machine frame 2
Between the base end wall 2BW of A and the first support wall 2SWa and at a position substantially at the same height as the shaft center of the sewing machine main shaft 31, its longitudinal direction is oriented in a direction orthogonal to the longitudinal direction of the sewing machine main shaft 31. The working end 78a, which is the tip of the feed adjusting button 78, can contact the recess 65b formed on the outer circumference of the ratchet 65.

The feed adjusting button 78 and the base front wall 2F
A sealing device, more specifically, an oil seal 80, is provided between the WA and the WA as a leak preventing unit that prevents the lubricating oil inside the coupling mechanism housing 16 from leaking to the outside. As a result, the operation portion 78b of the feed adjusting button 78 can be exposed to the outside of the sewing machine frame 2. Further, the feed adjusting button 78 has a large-diameter operating portion 78b.
And the retaining ring 81 regulate the maximum movement position along the thickness direction of the base front wall 2FWA, and the compression spring 8 arranged on the operating end 78a side of the feed adjusting button 78.
With the urging force of 2, the operating portion 78b, which is always exposed to the outside of the sewing machine frame 2, is urged in a direction away from the outer surface of the base front wall 2FWA, and the operating end 78a of the feed adjusting button 78 also moves to the ratchet 65. It is separated from the concave portion 65b formed on the outer periphery.

The feed cam mechanism 60 of this embodiment as described above.
According to the feed adjusting button 78, the feed adjusting button 7
When the operating end 78b of No. 8 is pushed by the operator, the operating end 78a of the feed adjusting button 78 comes into contact with the concave portion 65b formed on the outer periphery of the ratchet 65, and the ratchet 65 and the ratchet gear 62 are disengaged from each other. Here, the feed pitch can be changed by rotating the sewing machine main shaft 31 to change the eccentric amount of the feed cam 69. This time,
The feed adjusting cam 66 does not rotate because the ratchet 65 is located on the ratchet slide surface 66a. Also,
The support base 71 rotates together with the sewing machine main shaft 31. Here, since the support base engaging portion 69b of the feed cam 69 is engaged with the engaged portion 71a of the support base 71, the feed cam 69 rotates together with the sewing machine main shaft 31. Since the surface is engaged with the square piece 68, it cannot rotate concentrically with the sewing machine main shaft 31, and the cam portion 6 of the feed cam 69 is not able to rotate.
9c changes the amount of eccentricity with respect to the sewing machine main shaft 31. As a result, the drive amount of the feed drive shaft 61 with respect to the sewing machine main shaft 31 can be easily adjusted.

Support base 7 of the feed cam mechanism 60 of this embodiment
As shown in FIG. 10 and FIG. 13, the worm 1 has a trapezoidal screw 85a or the like formed on the outer periphery thereof to form a worm 85. That is, in the present embodiment, the worm 85, which is conventionally a separate component, is integrally formed on the outer periphery of the support base 71, which is a portion of the feed cam mechanism 60 that integrally rotates concentrically with the sewing machine main shaft 31. There is. The worm wheel 86 (FIG. 10) is meshed with the worm 85 as in the conventional case.
Is fixed to the upper end of a pump drive shaft (not shown) vertically supported inside the base 2A. The driving force of the sewing machine main shaft 31 drives an oil pump (not shown) disposed inside the oil pan 3 to pump up the lubricating oil stored in the bottom of the oil pan 3. . The worm 85 is provided on the support base 7.
The sewing machine main shaft 31 of the feed cam mechanism 60 is not limited to 1
A portion that rotates integrally with the feed adjusting cam 66.
May be provided on the outer periphery of the feed cam 69, but is preferably provided on the outer periphery of the support base 71 in the sense that interference between the worm wheel 86 and related parts of the feed cam mechanism 60 can be easily prevented.

Returning to FIG. 11, a lubricating oil supply passage 88, through which lubricating oil can flow, is formed between the right end inside the sewing machine main shaft 31 and the third bearing mounting portion 36C. The lubricating oil supply passage 88 has a lubricating oil supply port 88a used for supplying lubricating oil at the center of the third bearing mounting portion 36C, and has four crank pins 37A, 37B, 37C, 3
Lubricating oil discharge ports 88b for supplying lubricating oil to the sliding portions are provided at a total of 5 locations in the central portion of the 7D and feed cam mechanism 60, and are supplied from the lubricating oil feed opening 88a. As shown by the arrow O in FIG. 11, the lubricating oil is discharged from the respective lubricating oil discharge ports 88b so that each sliding portion, more specifically, the upper looper driving connecting rod 41 and the knife driving connecting rod 42 with respect to the sewing machine main shaft 31. The sliding portions such as the needle driving connecting rod 43, the lower looper driving connecting rod 44, and the feed cam 69 of the feed cam mechanism 60 are formed so that they can be lubricated with oil. The lubricating oil is supplied to the lubricating oil supply port 88a of the sewing machine main shaft 31 by pumping the lubricating oil stored in the lower portion of the oil pan 3 with an oil pump (not shown) driven by the driving force of the sewing machine main shaft 31. It is formed so that the lubricating oil pumped up in (3) can be supplied through an oil supply pipe (not shown) through an oil supply hole 33Ca formed in the third main shaft bearing 33C.

The third bearing mounting portion 36 of the sewing machine main shaft 31.
On the left side of C, a double ring drive connecting rod mounting portion 91 and a feed vertical corner piece connecting portion 92 which are eccentric cams are formed in this order. The base end of the double-ring driving connecting rod 94 shown in FIG. 9 is mounted on the double-ring driving connecting rod mounting portion 91, and the feed up-down angle piece connecting portion 92 is provided with the feed up-down angle piece 95. Is installed. In addition, the sewing machine spindle 3
A grease accommodating portion 97 capable of accommodating grease is formed between the tip portion TS inside 1 and the left side of the third bearing mounting portion 36C. As indicated by an arrow G, the double-ring drive connecting rod mounting portion 91 and the feed vertical corner piece connecting portion 92 are shown.
The two grease holes 97a formed in the respective central portions of the sewing machine frame 2 form the feed mechanism housing portion 17 of the sewing machine frame 2 by leaching out little by little to the outside as shown by an arrow G in FIG. 2 Sliding parts of the sewing machine main shaft 31 arranged in the inner space 2Bab of the cloth table receiving part, specifically, sliding parts of the sewing machine main shaft 31 such as the double ring drive connecting rod 94 and the feed vertical angle piece 95, are grease lubricated. It is made possible. Further, the grease discharge port 97a is formed along the radial direction of the sewing machine main shaft 31, so that the state of discharge of grease from the grease discharge port 97a accompanying the rotation of the sewing machine main shaft 31 can be made smoother. That is, the grease can be smoothly discharged from the grease discharge port 97a by the centrifugal force when the sewing machine main shaft 31 is rotationally driven. In addition, the feed vertical angle piece 95,
As shown in FIG. 9, a main feed swing rod 98 and a sub feed swing rod 99 are connected. Further, as the grease to be stored in the grease storage portion 97, a poly-α-orphin lithium-based grease is preferable. Such a grease storage unit 97
The grease discharge port 97a is provided on the main shaft 31 of the sewing machine.
It can be applied to various movable shafts such as driven shafts.

The base end portion of the sewing machine main shaft 31 located on the base end side BS extends to the outside of the sewing machine frame 2 as shown in FIG. 10, and the base end portion of the sewing machine main shaft 31 has As is well known in the art, a pulley 100 for transmitting the rotation of the sewing machine motor via a belt is fixed.

As shown in FIGS. 9 and 10, a feed drive shaft 61 extending in parallel with the sewing machine main shaft 31 is disposed on the rear side RS in the lower portion of the sewing machine frame 2. The feed drive shaft 61 includes a base portion 2A of the sewing machine frame 2 and a cloth base receiving portion 2B, specifically, a base end wall 2BW and an intermediate wall 2MW.
And the first feed shaft bearing 102 held in feed shaft support holes 101A, 101B, 101C (FIG. 6) formed so as to coaxially penetrate the tip wall 2TW.
A, a second feed shaft bearing 102B and a third feed shaft bearing 102C are rotatably supported. A bearing metal (sliding bearing) is used as the first feed shaft bearing 102A, the second feed shaft bearing 102B, and the third feed shaft bearing 102C in the present embodiment. Then, the feed drive shaft 61 is disposed in the connecting mechanism housing 16 of the sewing machine frame 2 with the second feed bearing mounting portion 103B as a boundary, and the feed mechanism housing 1 of the sewing machine frame 2.
7 is divided into parts to be arranged.

First feed shaft bearing 1 of the feed drive shaft 61
02A is mounted on the first feed bearing mounting portion 103A and the second
The feed bifurcated crank 75 of the feed cam mechanism 60 is connected to a portion located between the feed shaft bearing 102B and the second feed bearing mounting portion 103B. Also,
The second feed bearing mounting portion 103B on which the second feed shaft bearing 102B of the feed drive shaft 61 is mounted and the third feed shaft bearing 10
As shown in FIG. 9, a main feed arm 106 and a sub-feed which form part of a conventionally known feed mechanism 105 excluding the feed cam mechanism 60 are provided between the second feed bearing mounting portion 103C and the third feed bearing mounting portion 103C. The base end of the arm 107 is connected. The other end of the main feed link 108, one end of which is connected to the main feed swing rod 98, is connected to the tip of the main feed arm 106. Further, the tip of the sub-feed arm 107 is connected to the sub-feed swing rod 99 via the sub-feed pin square piece 109.
One end of the differential adjustment link 111 is connected via 0. The other end of the differential adjustment link 111 is held in a differential adjustment shaft support hole (not shown) provided in the tip wall 2TW of the sewing machine frame 2 and the differential adjustment shaft bearing 112 is held.
(FIG. 9) The differential adjustment shaft 113 is rotatably supported.
It is connected to the.

Further, one end of the feed drive shaft 61 is located at the tip of the double ring drive connecting rod 94 between the portions where the base ends of the main feed arm 106 and the sub feed arm 107 are connected. The other end of the double ring front and rear arms 114 connected,
The base end portion of the double ring front and rear arm 114 connected to the base end portion of the double ring drive shaft 115 located inside the second cloth receiving portion internal space 2Bab of the sewing machine frame 2 is connected. Note that the feed mechanism 105 that converts the driving force output from the feed drive shaft 61 into a predetermined up / down and forward / backward movement and transmits it to a feed dog (not shown) is a conventionally known configuration, and a detailed description thereof will be given. Is omitted.

Second feed shaft bearing 1 of the feed drive shaft 61
On the left side of the part where 02B is mounted, as shown in FIG.
7 is formed, and the grease storage portion 11 for the feed shaft is formed.
As shown in FIG. 10, the grease stored in No. 7 is gradually exuded to the outside from the four feed shaft grease holes 117a, so that the feed drive shaft 61 arranged in the feed mechanism storage unit 17 of the sewing machine frame 2 can be operated. Each sliding part, more specifically, a sliding part with respect to the feed drive shaft 61, such as the double ring front and rear arms 114 and the third feed shaft bearing 102C, is formed so that grease lubrication is possible. In addition, the grease storage part 11 for the feed shaft
As the grease to be stored in No. 7, a poly-α-orifice lithium-based grease is preferable.

The upper looper drive shaft 46 includes a front wall 2FW of the sewing machine frame 2 and a front side F of the second support wall 2SWb.
When viewed from S, the right side of the intermediate wall 2MW is provided with both walls 2FW and 2SW in a direction orthogonal to the longitudinal direction of the sewing machine main shaft 31.
b, the first upper looper shaft bearing 122A and the second upper looper shaft bearing 122B (FIG. 7) held respectively in upper looper shaft support holes 121A and 121B (FIG. 7) formed so as to penetrate coaxially with each other. It is rotatably supported by 9). The front end portion of the upper looper drive shaft 46 located on the front side FS is projected into the upper looper mechanism housing portion 21 formed outside the front wall 2FW. A not-shown conventionally known upper looper mechanism is connected to the tip of the upper looper drive shaft 46. It should be noted that the sewing machine main shaft 31 or the feed drive shaft 61 is attached to the tip side of the upper looper drive shaft 46.
By providing a grease storage portion capable of storing the same grease as in (3) above, the sliding portion of the upper looper mechanism disposed inside the upper looper mechanism storage portion 21 can be grease-lubricated with grease. If the grease storage portion is not provided, grease may be applied to the sliding portion of the upper looper mechanism. Further, the configuration of the upper looper mechanism that converts the driving force output from the upper looper drive shaft 46 into a swinging motion and transmits the swinging motion to the upper looper is conventionally known, and a detailed description thereof will be omitted.

As shown in FIG. 5, the knife drive shaft 48 is located above the portion of the base 2A of the sewing machine frame 2 where the sewing machine main shaft 31 is disposed, specifically, the height of the first support wall 2SWa and the intermediate wall 2MW. The first female shaft bearing 125 held in female shaft support holes 124A, 124B (FIG. 5) formed so as to coaxially pass through both walls 2SWa, 2MW at a substantially central position in the horizontal direction.
It is rotatably supported by A and the second female shaft bearing 125B. A tip end portion of the knife drive shaft 48 located on the tip end side TS is projected above the cloth base receiving portion 2B of the sewing machine frame 2, and the tip end portion of the knife drive shaft 48 is a conventionally known cloth not shown. A cutting mechanism is provided. As this cloth cutting mechanism, a conventionally known one is used, and its detailed description is omitted.

The needle drive shaft 50 is located above the base 2A of the sewing machine frame 2 where the sewing machine main shaft 31 is disposed, specifically, in the left-right direction above the first support wall 2SWa and the intermediate wall 2MW in the height direction. Needle shaft support hole 127 formed so as to coaxially penetrate both walls 2SWa, 2MW
It is rotatably supported by the first needle shaft bearing 128A and the second needle shaft bearing 128B which are respectively held by A and 127B (FIG. 5). The tip end portion of the needle drive shaft 50 located on the tip end side TS is formed by the head internal space 2Ca of the sewing machine frame 2 and the needle mechanism housing portion 18 is formed.
It is projected inside. The tip of the needle drive shaft 50 is connected to the needle bar 129 through a conventionally known needle bar drive mechanism, and the needle N (FIG. 1) attached to the lower end of the needle bar 129 is attached to the sewing machine main shaft. It can be moved up and down with a driving force of 31. The needle bar drive mechanism used heretofore is publicly known, and its detailed description is omitted.

The needle bar 129, like the conventional one, is a pair of upper and lower bearings disposed on the head portion 2C of the sewing machine frame 2 and is a needle bar upper metal 130A and a needle bar lower metal 130B.
It is reciprocally supported by (FIG. 9). It should be noted that by providing a grease storage portion, which can store the same grease as the sewing machine main shaft 31 or the feed drive shaft 61, on the tip end side of the needle drive shaft 50, the needle mechanism disposed inside the needle mechanism storage portion 18 can be The sliding portion can be grease lubricated with grease. If the grease storage portion is not provided, grease may be applied to the sliding portion of the needle mechanism. Further, the base end side BS of the needle drive shaft 50 is provided with a lubricating oil supply passage for lubricating oil similar to that of the sewing machine main shaft 31, or lubricating oil from an oil pump (not shown) is applied to the bearing portions (128A, 128B). By injecting, the needle drive shaft 5
The sliding portion arranged in the connection mechanism housing portion 0 of 0 can be oil-lubricated by the lubricating oil.

The lower looper drive shaft 52 has a front wall 2FW of the sewing machine frame 2 and an intermediate wall 2M between the second support wall 2SWb.
Lower looper shaft support holes 132A, 13 formed so as to coaxially penetrate both walls 2FW, 2SWb in the direction orthogonal to the longitudinal direction of the sewing machine main shaft 31 on the left side of W.
The first lower looper shaft bearing 133A and the second lower looper shaft bearing 133B which are respectively held by 2B (FIG. 7).
It is rotatably supported by (FIG. 9). The front end portion of the lower looper drive shaft 52 located on the front side FS is projected into the outer internal space 2FOWa forming the lower looper / double ring mechanism housing portion 23 formed outside the front wall 2FW. . A not-shown conventionally known lower looper mechanism is connected to the tip of the lower looper drive shaft 52. As the lower looper mechanism, a conventionally known one is used, and its detailed description is omitted.

The double ring drive shaft 115 is provided on the front side wall 2FW of the sewing machine frame 2 and the front end side TS of the second support wall 2SWb.
Are held in double ring shaft support holes 135A and 135B (FIG. 7) formed so as to coaxially penetrate both walls 2FW and 2SWb in a direction orthogonal to the longitudinal direction of the sewing machine main shaft 31. First double ring shaft bearing 13
6A and the second double ring shaft bearing 136B (FIG. 9) so as to be freely rotatable. This double ring drive shaft 115
The front end portion located on the front side FS of the above protrudes into the outer internal space 2FOWa forming the lower looper / double ring mechanism housing portion 23 formed outside the front wall 2FW. A not-shown conventionally-known double ring mechanism is connected to the tip of the double ring drive shaft 115. A conventionally known one is used as the two-forming heavy ring mechanism, and a detailed description thereof will be omitted.

The lower looper drive shaft 52 and the double ring drive shaft 115, as shown in FIG. 9, form a part of the connecting mechanism housing portion 16 of the sewing machine frame 2 in the inner space of the first cloth tray receiving portion. In 2Baa, they are connected so as to be synchronously driven by a coupling connection link 138.

Connecting mechanism housing 1 for the sewing machine frame 2
6 and the needle mechanism accommodating portion 1 adjacent to the connecting mechanism accommodating portion 16
8, a leakage preventing means (not shown) for preventing the leakage of the lubricating oil is provided at the boundary between the feeding mechanism housing 17, the upper looper mechanism housing 21, and the lower looper / double ring mechanism housing 23. There is.

That is, in the portion where the second needle shaft bearing 128B, which is the boundary between the connecting mechanism housing 16 of the sewing machine frame 2 and the needle mechanism housing 18 adjacent to the connecting mechanism housing 16, is disposed. Leakage preventing means for preventing the lubricating oil from leaking to the needle mechanism housing portion 18 (head internal space 2Ca) is provided. Then, the third spindle bearing 33C, which is the boundary portion between the coupling mechanism housing portion 16 of the sewing machine frame 2 and the feed mechanism housing portion 17 adjacent to this coupling mechanism housing portion 16,
Feed shaft bearing 102B, first lower looper shaft bearing 133
A, a leakage preventing means for preventing the lubricating oil from leaking to the feed mechanism housing portion 17 (the second cloth receiving portion internal space 2Bab) is provided in each of the disposing portions of the first double annular shaft bearing 136A. It is provided. Further, the first upper looper shaft bearing 122A, which is a boundary portion between the coupling mechanism housing portion 16 of the sewing machine frame 2 and the upper looper mechanism housing portion 21 adjacent to the coupling mechanism housing portion 16, is provided with lubrication. Leakage preventing means for preventing oil from leaking to the upper looper mechanism housing 21 (upper looper internal space 2FPWa) is provided. Further, the first spindle bearing 33A, the first feed shaft bearing 102A, and the second female shaft bearing, which are the boundary portions between the coupling mechanism housing portion 16 of the sewing machine frame 2 and the outside adjacent to the coupling mechanism housing portion 16. 125B, the second lower looper shaft bearing 133B, the second double annular shaft bearing 136B, the flange-shaped housing 34, the feed adjusting button 78, the frame upper cover 4 and the oil pan 3 are also provided with lubricating oil to the outside. Leakage prevention means is provided to prevent leakage.

As the leakage preventing means, a sealing device such as an O-ring, an oil seal, a packing, a gasket, or the like,
Peripheral sealing means to prevent leakage from the outer peripheral part of the bearing such as sealant, adhesive, adhesive, etc. If sintered metal is used for the bearing, it is used after sealing treatment, or sintered metal is not used for the bearing Depending on the need such as the structure and design concept of the leakage prevention part, it can be selected from bearing sealing means for preventing leakage of lubricating oil from the bearing itself, such as a structure or using a bearing with a seal.

By providing such leakage prevention means, the lock sewing machine 1 of the present embodiment seals the connecting mechanism housing portion 16 of the sewing machine frame 2 and slides the connecting mechanism arranged inside thereof. Can be oil-lubricated with lubricating oil. Also, sewing machine frame 2
Of the needle mechanism accommodating portion 18, the feed mechanism accommodating portion 17, and the upper looper mechanism accommodating portion 21 so that the mechanism sliding portion disposed inside the accommodating portion can be grease lubricated with grease. Has become.

Next, the operation of this embodiment having the above-mentioned structure will be described.

According to the lock sewing machine 1 of this embodiment, it is arranged on the base end side BS of the sewing machine main shaft 31, connects the sewing machine main shaft 31 and the feed drive shaft 61, and connects the sewing machine main shaft 31 with the feed drive shaft 61. Since the feed cam mechanism 60 that adjusts the drive amount and the worm 85 that is integrally formed with the feed cam mechanism 60 and that drives the oil pump are included,
Unlike the conventional case, the worm 85 and the feed cam mechanism 60 can be arranged at one place of the sewing machine main shaft 31.

That is, according to the lock sewing machine 1 of this embodiment, by integrating the worm 85 and the feed cam mechanism 60, which are conventionally separate components, the space is saved and the size is reduced, and the number of components is increased. It is possible to easily and surely reduce the cost by reducing the cost. By forming the worm 85 on the support base 71 of the feed cam mechanism, it is possible to reduce the labor required for management such as inventory management of parts. Further, in the conventional lock sewing machine, an individual feed cam mechanism is arranged on the tip side TS of the sewing machine main shaft 31, and a worm formed individually is arranged on the base end side BS of the sewing machine main shaft.

Further, according to the lock sewing machine 1 of the present embodiment, the worm 85 is provided on the support base 71 which is a portion of the feed cam mechanism 60 that integrally rotates concentrically with the sewing machine main shaft 31. 85 feed cam mechanism 60
Can be surely integrated.

The present invention is not limited to the above embodiment, but various modifications can be made as necessary. For example, the feed cam mechanism in which the worm of the present embodiment is integrally formed can be arranged in the sewing machine frame of an existing lock sewing machine.

[0064]

As described above, according to the lock sewing machine of the present invention according to the first aspect, it is possible to achieve an extremely excellent effect such that the size and cost can be easily reduced.

According to the lock sewing machine of the second aspect of the present invention, the worm can be surely integrated with the feed cam mechanism, which is extremely advantageous.

[Brief description of drawings]

FIG. 1 is an external perspective view showing a main part of an embodiment of a lock sewing machine according to the present invention.

2 is a front view of FIG.

FIG. 3 is an exploded perspective view of the sewing machine frame of FIG. 1 and a main part in the vicinity thereof.

FIG. 4 is a left side view showing the sewing machine frame of FIG. 1 in a simplified manner.

FIG. 5 is a sectional view taken along line 5-5 of FIG.

6 is a sectional view taken along line 6-6 of FIG.

7 is a bottom view of FIG.

FIG. 8 is a perspective view showing a simplified main part of the sewing machine frame of FIG.

FIG. 9 is a mechanism diagram schematically showing a main part of an embodiment of a lock sewing machine according to the present invention.

FIG. 10 is a bottom view showing the vicinity of the main shaft and the feed drive shaft of the lock sewing machine according to the embodiment of the present invention.

FIG. 11 is a front view showing the structure of the sewing machine spindle of the lock sewing machine according to the embodiment of the present invention.

FIG. 12 is an exploded perspective view showing a configuration of a main part of a feed cam mechanism of an embodiment of a lock sewing machine according to the present invention.

FIG. 13 is a development view showing a state of an actual part arrangement of a main part of the feed cam mechanism of the lock sewing machine according to the embodiment of the present invention as viewed from the base end side.

[Explanation of symbols]

1 lock sewing machine 2 sewing machine frame 3 oil pan 31 sewing machine spindle 43 Needle drive connecting rod 50 needle drive shaft 51 Needle drive link 60 feed cam mechanism 61 Feed drive shaft 63 ratchet gear 64 spring 65 ratchet 66 Feed adjustment cam 68 Square pieces 69 feed cam 71 Support 72 bearing 73 Feed drive connecting rod 75 feed bifurcated crank 78 Feed adjustment button 85 Worm Wheel 86 worms 105 feed mechanism 129 needle bar FS front side RS back side BS proximal side TS tip side N needle

   ─────────────────────────────────────────────────── ─── Continued front page    F term (reference) 3B150 AA08 CE01 CE04 CE25 DE06                       DE23 DE29 DE33 GA01 GA27                       GB01 GB05 GB06 GB09 JA20                       JA28 JA32 JA36

Claims (2)

[Claims] 1. A feed cam mechanism which is disposed on a base end side of a sewing machine spindle, which connects the sewing machine spindle and the feed drive shaft, and which adjusts a drive amount of the feed drive shaft with respect to the sewing machine spindle, and the feed cam. A lock sewing machine, which is integrally formed with the mechanism and has a worm for driving an oil pump. 2. The lock sewing machine according to claim 1, wherein the worm is provided in a portion of the feed cam mechanism that integrally rotates concentrically with the sewing machine main shaft.