CA1264989A - Overlock machine - Google Patents
Overlock machineInfo
- Publication number
- CA1264989A CA1264989A CA000508414A CA508414A CA1264989A CA 1264989 A CA1264989 A CA 1264989A CA 000508414 A CA000508414 A CA 000508414A CA 508414 A CA508414 A CA 508414A CA 1264989 A CA1264989 A CA 1264989A
- Authority
- CA
- Canada
- Prior art keywords
- knife
- movable
- bed frame
- movable portion
- thread
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
Landscapes
- Sewing Machines And Sewing (AREA)
Abstract
Abstract An improved overlock machine is proposed which is easier to set a thread through a looper. The members which would obstruct the access to the looper are mounted on a movable portion of a bed frame. By swinging open the movable portion, the obstructing members are moved to their inoperative position. A fixed knife only, or both the fixed knife and the movable knife are mounted on the movable portion.
Description
Considerable difficulty has been experienced in setting the thread on the lower looper of the known overlock machines. This difficulty results from the difficulty encountered in attempting to obtain access to the path along which the thread must pass in attempting to set the thread through the lower looper.
In addition, the known fixed knife structure and the parts used for securing the fixed knife to the bed frame of the machine, together with the throat plate which is mounted on the bed portion, obstruct the operator's view of the lower looper and also present obstructions which make the manual manipulation of a thread around the thread path to be very difficult and time-consuming.
In accordance with one aspect of the present invention, there is provided an overlock machine comprising a bed frame, a fixed knife, a movable knife cooperating with said fixed knife to cut the edge of a cloth, a support member adapted to be coupled to a moving part of the machine for supporting said movable knife, and a lower looper provided rearwardly of said fixed knife and said movable knife, characterized in that said bed frame has a movable portion adapted to be moved to an inoperative position so as not to obstruct the vie~ing of and the access to said lower looper for the placement of a thread through said lower looper, at least one of said knife means being mounted on said movable portion of said bed frame, said movable portion being provided with engagement means for releasable engagement with a body portion of said bed frame.
- ~269MC20 ~ 8~
The invention will be more clearly understood with reference to the following detailed specification read in conjunction wlth the drawings wherein:
Fig. 1 is a perspective view of a first embodiment with the movable portion of the bed frame in its closed position;
Fig. 2 is a perspective view thereof with the movable portion in an open position;
Fig. 3 is a partially sectional rear view of the movable portion of the first embodiment;
Fig. 4 is a side view showing the driving mechanism for the movable knife in the first embodiment Fig. 5 is a perspective view of the second embodiment with the movable portion of the bed frame in its closed position;
Fig. 6is a perspective view thereof with the movable portion in an open position;
Figs. 7 and 8 are enlarged plan views showing the manner in which the movable shaft is mounted;
Figs. 9 and 10 are perspective views of the two prior art overlock machines; and Fig. 11 is a partially cutaway front view of the lower looper.
Figs. 9 and 10 show two prior art overlock machines. These prior machines each have a bed frame 1 and a bed 2. (Fig. 9) The bed is formed with an opening 4 which is covered by a throat plate 3 which can be opened~ A fixed ~- A : -- 4269MC20 ~ ~6~
knife 5 is mounted on a left side wall 6 of the bed frame 1. A
rod 8 is slidably mounted on guides 9 and 10 so that it can be elevated as required in use. A movable knife 11 is fixed to the top end of the rod 8. A blade 12 which is located on the fixed knife 5 cooperates with a blade 13 of the movable knife 11 to cut the edge of a cloth and serves to form an even cut.' The guides 9, 10 have shafts 14, 15, respectively, which are mounted on the left side wall 6 of the bed frame 1 so as to be retractable. The guide 9 is biassed leftwardly by a spring to press the movable knife 11 against the right hand side of the fixed knife 5. A roller 17 is coupled to a block 16 which is fixedly mounted on the rod 8. A forked lever 18 is coupled to a moving part of the machine and engages the roller 17, so that the rod 8 will move up and down as the machine is operated.
In another prior art overlock machine shown in Fig.
10, the fixed knife 5 is fixed to a fitting 20 which is located under the bed 2. The movable knife 11 is fixed to one end of a shaft 24 which is rotatably and slidably mounted in a boss 23 which is provided at a front end of a lever arm 22 which has its rear end portion mounted on a machine body which which is locaated on the bed 2. As shown in Figs. 7 and 8, a spring 25 which is located in the boss 23 urges the movable knife 11 to the left of the position in which it is shown and serves to press it against the right-hand side face of the fixed knife 5.
The shaft 24 has a pin 28 extending radially therefrom and the boss 23 is formed with a notch 29 to receive the pin 28. When the pin 28 is received in the notch 29 as ~' ' ' ' 38~
- ~269MC20 -shown in Fig. 7, the movable kniEe 11 extends downwardly and is pressed by the resilience of the spring 25 against the fixed knife 5. ~hen a knob 30 at the right hand end of the shaft 24 is operated to pull the sha~t 24 to the right of the position shown in Fig. 7, to disengage the pin 28 from the notch 29 and the knob is then rotated, the movablle knife 11 will extend forwardly with the pin 28 bearing against the right hand side of the boss 23, as shown in Fig. ~.
In either of the two prior art overlock machines, a lower looper 32 is fixed to the top of a level 34 which is pivotably mounted on a shaft 33 which projects from the bed frame 1. As shown in Fig. 11, the lower looper 32 is formed with a thread hole 35 at its left hand end viewing from the operator side. The thread is passed through the passage 35, in and along a thread groove 36, and into a thread passage 37 at the other end of the looper 32.
As shown by the dotted lines in Figs. 9 and 10, the left hand end of the bed frame 1 has an auxiliary bed 40 which can be moved to an open position. In order to pass a thread through the lower looper 32, a front cover (not shown~ is firstly opened and the auxiliary bed 40 is then opened. The thread from a bobbin (not shown) is passed through a thread tension adjusting assembly and a thread guide (both not shown~, through a thread guide 41, under the fixed knife 5 and the throat plate 3, or through an opening 42 in the left side wall 6 of the bed frame 1, and pulled out from the rear of the lower looper 32. The thread is then passed through the hole 35 of A ~ ~
~2~
the lower looper 32, guided in the groove 36, and passed through the hole 37 at the tip of the lower looper.
As described above, the setting of a thread through the lower looper 32 is very difficult. In addition, the fixed knife 5, the parts for securing the fixed knife, the bed frame for supporting it, and the bed portion supporting the throat plate 3 and extending forwardly obst:ruct the operator's view of the lower looper 32 and restrict finger access. This makes the thread setting on the lower looper very difficult and time-consuming.
The first embodiment shown in Figs. 1 - 4 provides an improvement of the prior art overlock machine shown in Fig.
9. Both the fixed knife 5 and the movable knife 11 are mounted on a movable portion 45 of a bed frame 1. The movable portion is mounted so as to pivot on a shaft 46 as shown in Fig. 3. A
fixed knife 5 is bolted to a mounting surface 44 of the movable portion 45.
A movable knife 11 is mounted on a rod 8 (Fig. 3) which is mounted to reciprocate vertically. A shaft 14 of a guide 9 which is mounted on the rod 8 is retractably mounted in a mounting portion 48 which is carried by the movable portion 45. The shaft 14 is biassed by a spring 49 mounted thereon in a passage formed in the rear end of the shaft and supported by a spring support 50 which is secured to the rear end of the shaft 140 The spring is operable to normally urge the movable knife 11 to bear against the fixed knife 5.
A forked lever 18 has its middle portion supported - ''.
98~
~ 4269MC20 -by a shaft 51 and its rear end coupled to a link 53 whlch is moved up and down by a lower shaft 52 of the machine through an eccentric (Fig. 4). The forked lever 18 has its front portion biforkated to receive a roller 17 disposed in the movable portion 45.
A hook 55 ~Figs. 2 - 4) is secured to the inner end of a transverse shaft 57 which is rotatably mounted in the movable portion 45. A knob 58 is secured to the outer end of the transverse shaft 57. The hook 55 is adapted to engage an engagement piece 60 fixed in the bed frame l (Fig. 2). When the movable portion ~5 is closed, the hook 55 engages the engagement piece 60 by the action of a spring. By operating the knob 58, the hook 55 can be disengaged from the engagement piece 60.
In the first embodiment, with the movable portion 45 closed, the hook 55 engages the engagement piece 60 and the forked lever 18 engages the roller 17 on the rod 8. Thus, as the machine operates, the forked lever 18 will pivot up and down, so that the rod 8 and thus the movable knife ll will reciprocate up and down.
When passing a thread through the lower looper 32, the knob 58 is operated to disengage the hook 55 from the engagement piece 60. Thereafter, the movable portion 45 can be swung to its inoperative position as shown in Figure 2. This allows a clear view of and easy finger access to the lower looper 32. Setting a thread on the looper 32 is now very easy.
The second embodiment shown in Figs. 5 and 6 A
~1 ~G~98~
provides an improvement of the prior art overlock machine shown in Fig. 10. The movable knife 11 is supported in the same manner as in the prior art overlock machine, as shown in Figs.
7 and 8 and described before. In this embodiment only the fixed knife 5 is secured to a mounting plate 47 which, in turn, is secured to the movable portion 45. As in the first embodiment, a hook 55 and a knob 58 are fixedly mounted on a transverse shaft 57 which is rotatably mounted on the movable portion 45. The hook 55 is adapted to engage an engagement piece 60 which is secured to the bed frame 1.
As in the first embodiment, with the movable portion 45 closed, the hook 55 engages the retainer piece 60. With the movable knife 11 extending downwardly and the pin 28 engaged in the notch 29 in the boss 23 as shown in Fig. 7, the movable knife 11 is pressed against the fixed knife 5, as shown in Fig.
5, and moves up and down, as the machine operates, to cut the cloth edge evenly.
In order to set a thread through the lower looper 32, the knob 30 is pulled to displace to shaft 2~ and compress the spring 25 to disengage the pin 28 from the notch 29. The knob 30 is then rotated to the position shown in Fig. 8 where the movable knife 11 extends forwardly.
When the lower knob 58 is operated to disengage the hook from the retainer piece 60 and the movable portion 45 is moved to its open inoperative position as shown in Fig. 6, an unobstructed view of and unobstructed finger access is provided to the lower looper 32~ as in the first embodiment. It is now A
8:~3 - ~269MC20 -possible to thread the lower looper with ease.
Although in the preferred embodiments the movable portion ~5 is adapted to be pivoted sidewise, it may be adapted to be pivoted downwardly, to be pulled out, or to be moved to its inoperative position in any other way.
Although in the embodiments a forked lever 18 is coupled to the machine body ancl the roller 17 is used to move the movable knife up and down, a roller may be used instead of the forked lever and a forked :Lever may be used instead of the roller.
A :
In addition, the known fixed knife structure and the parts used for securing the fixed knife to the bed frame of the machine, together with the throat plate which is mounted on the bed portion, obstruct the operator's view of the lower looper and also present obstructions which make the manual manipulation of a thread around the thread path to be very difficult and time-consuming.
In accordance with one aspect of the present invention, there is provided an overlock machine comprising a bed frame, a fixed knife, a movable knife cooperating with said fixed knife to cut the edge of a cloth, a support member adapted to be coupled to a moving part of the machine for supporting said movable knife, and a lower looper provided rearwardly of said fixed knife and said movable knife, characterized in that said bed frame has a movable portion adapted to be moved to an inoperative position so as not to obstruct the vie~ing of and the access to said lower looper for the placement of a thread through said lower looper, at least one of said knife means being mounted on said movable portion of said bed frame, said movable portion being provided with engagement means for releasable engagement with a body portion of said bed frame.
- ~269MC20 ~ 8~
The invention will be more clearly understood with reference to the following detailed specification read in conjunction wlth the drawings wherein:
Fig. 1 is a perspective view of a first embodiment with the movable portion of the bed frame in its closed position;
Fig. 2 is a perspective view thereof with the movable portion in an open position;
Fig. 3 is a partially sectional rear view of the movable portion of the first embodiment;
Fig. 4 is a side view showing the driving mechanism for the movable knife in the first embodiment Fig. 5 is a perspective view of the second embodiment with the movable portion of the bed frame in its closed position;
Fig. 6is a perspective view thereof with the movable portion in an open position;
Figs. 7 and 8 are enlarged plan views showing the manner in which the movable shaft is mounted;
Figs. 9 and 10 are perspective views of the two prior art overlock machines; and Fig. 11 is a partially cutaway front view of the lower looper.
Figs. 9 and 10 show two prior art overlock machines. These prior machines each have a bed frame 1 and a bed 2. (Fig. 9) The bed is formed with an opening 4 which is covered by a throat plate 3 which can be opened~ A fixed ~- A : -- 4269MC20 ~ ~6~
knife 5 is mounted on a left side wall 6 of the bed frame 1. A
rod 8 is slidably mounted on guides 9 and 10 so that it can be elevated as required in use. A movable knife 11 is fixed to the top end of the rod 8. A blade 12 which is located on the fixed knife 5 cooperates with a blade 13 of the movable knife 11 to cut the edge of a cloth and serves to form an even cut.' The guides 9, 10 have shafts 14, 15, respectively, which are mounted on the left side wall 6 of the bed frame 1 so as to be retractable. The guide 9 is biassed leftwardly by a spring to press the movable knife 11 against the right hand side of the fixed knife 5. A roller 17 is coupled to a block 16 which is fixedly mounted on the rod 8. A forked lever 18 is coupled to a moving part of the machine and engages the roller 17, so that the rod 8 will move up and down as the machine is operated.
In another prior art overlock machine shown in Fig.
10, the fixed knife 5 is fixed to a fitting 20 which is located under the bed 2. The movable knife 11 is fixed to one end of a shaft 24 which is rotatably and slidably mounted in a boss 23 which is provided at a front end of a lever arm 22 which has its rear end portion mounted on a machine body which which is locaated on the bed 2. As shown in Figs. 7 and 8, a spring 25 which is located in the boss 23 urges the movable knife 11 to the left of the position in which it is shown and serves to press it against the right-hand side face of the fixed knife 5.
The shaft 24 has a pin 28 extending radially therefrom and the boss 23 is formed with a notch 29 to receive the pin 28. When the pin 28 is received in the notch 29 as ~' ' ' ' 38~
- ~269MC20 -shown in Fig. 7, the movable kniEe 11 extends downwardly and is pressed by the resilience of the spring 25 against the fixed knife 5. ~hen a knob 30 at the right hand end of the shaft 24 is operated to pull the sha~t 24 to the right of the position shown in Fig. 7, to disengage the pin 28 from the notch 29 and the knob is then rotated, the movablle knife 11 will extend forwardly with the pin 28 bearing against the right hand side of the boss 23, as shown in Fig. ~.
In either of the two prior art overlock machines, a lower looper 32 is fixed to the top of a level 34 which is pivotably mounted on a shaft 33 which projects from the bed frame 1. As shown in Fig. 11, the lower looper 32 is formed with a thread hole 35 at its left hand end viewing from the operator side. The thread is passed through the passage 35, in and along a thread groove 36, and into a thread passage 37 at the other end of the looper 32.
As shown by the dotted lines in Figs. 9 and 10, the left hand end of the bed frame 1 has an auxiliary bed 40 which can be moved to an open position. In order to pass a thread through the lower looper 32, a front cover (not shown~ is firstly opened and the auxiliary bed 40 is then opened. The thread from a bobbin (not shown) is passed through a thread tension adjusting assembly and a thread guide (both not shown~, through a thread guide 41, under the fixed knife 5 and the throat plate 3, or through an opening 42 in the left side wall 6 of the bed frame 1, and pulled out from the rear of the lower looper 32. The thread is then passed through the hole 35 of A ~ ~
~2~
the lower looper 32, guided in the groove 36, and passed through the hole 37 at the tip of the lower looper.
As described above, the setting of a thread through the lower looper 32 is very difficult. In addition, the fixed knife 5, the parts for securing the fixed knife, the bed frame for supporting it, and the bed portion supporting the throat plate 3 and extending forwardly obst:ruct the operator's view of the lower looper 32 and restrict finger access. This makes the thread setting on the lower looper very difficult and time-consuming.
The first embodiment shown in Figs. 1 - 4 provides an improvement of the prior art overlock machine shown in Fig.
9. Both the fixed knife 5 and the movable knife 11 are mounted on a movable portion 45 of a bed frame 1. The movable portion is mounted so as to pivot on a shaft 46 as shown in Fig. 3. A
fixed knife 5 is bolted to a mounting surface 44 of the movable portion 45.
A movable knife 11 is mounted on a rod 8 (Fig. 3) which is mounted to reciprocate vertically. A shaft 14 of a guide 9 which is mounted on the rod 8 is retractably mounted in a mounting portion 48 which is carried by the movable portion 45. The shaft 14 is biassed by a spring 49 mounted thereon in a passage formed in the rear end of the shaft and supported by a spring support 50 which is secured to the rear end of the shaft 140 The spring is operable to normally urge the movable knife 11 to bear against the fixed knife 5.
A forked lever 18 has its middle portion supported - ''.
98~
~ 4269MC20 -by a shaft 51 and its rear end coupled to a link 53 whlch is moved up and down by a lower shaft 52 of the machine through an eccentric (Fig. 4). The forked lever 18 has its front portion biforkated to receive a roller 17 disposed in the movable portion 45.
A hook 55 ~Figs. 2 - 4) is secured to the inner end of a transverse shaft 57 which is rotatably mounted in the movable portion 45. A knob 58 is secured to the outer end of the transverse shaft 57. The hook 55 is adapted to engage an engagement piece 60 fixed in the bed frame l (Fig. 2). When the movable portion ~5 is closed, the hook 55 engages the engagement piece 60 by the action of a spring. By operating the knob 58, the hook 55 can be disengaged from the engagement piece 60.
In the first embodiment, with the movable portion 45 closed, the hook 55 engages the engagement piece 60 and the forked lever 18 engages the roller 17 on the rod 8. Thus, as the machine operates, the forked lever 18 will pivot up and down, so that the rod 8 and thus the movable knife ll will reciprocate up and down.
When passing a thread through the lower looper 32, the knob 58 is operated to disengage the hook 55 from the engagement piece 60. Thereafter, the movable portion 45 can be swung to its inoperative position as shown in Figure 2. This allows a clear view of and easy finger access to the lower looper 32. Setting a thread on the looper 32 is now very easy.
The second embodiment shown in Figs. 5 and 6 A
~1 ~G~98~
provides an improvement of the prior art overlock machine shown in Fig. 10. The movable knife 11 is supported in the same manner as in the prior art overlock machine, as shown in Figs.
7 and 8 and described before. In this embodiment only the fixed knife 5 is secured to a mounting plate 47 which, in turn, is secured to the movable portion 45. As in the first embodiment, a hook 55 and a knob 58 are fixedly mounted on a transverse shaft 57 which is rotatably mounted on the movable portion 45. The hook 55 is adapted to engage an engagement piece 60 which is secured to the bed frame 1.
As in the first embodiment, with the movable portion 45 closed, the hook 55 engages the retainer piece 60. With the movable knife 11 extending downwardly and the pin 28 engaged in the notch 29 in the boss 23 as shown in Fig. 7, the movable knife 11 is pressed against the fixed knife 5, as shown in Fig.
5, and moves up and down, as the machine operates, to cut the cloth edge evenly.
In order to set a thread through the lower looper 32, the knob 30 is pulled to displace to shaft 2~ and compress the spring 25 to disengage the pin 28 from the notch 29. The knob 30 is then rotated to the position shown in Fig. 8 where the movable knife 11 extends forwardly.
When the lower knob 58 is operated to disengage the hook from the retainer piece 60 and the movable portion 45 is moved to its open inoperative position as shown in Fig. 6, an unobstructed view of and unobstructed finger access is provided to the lower looper 32~ as in the first embodiment. It is now A
8:~3 - ~269MC20 -possible to thread the lower looper with ease.
Although in the preferred embodiments the movable portion ~5 is adapted to be pivoted sidewise, it may be adapted to be pivoted downwardly, to be pulled out, or to be moved to its inoperative position in any other way.
Although in the embodiments a forked lever 18 is coupled to the machine body ancl the roller 17 is used to move the movable knife up and down, a roller may be used instead of the forked lever and a forked :Lever may be used instead of the roller.
A :
Claims (3)
OR PRIVILEGE IS CLAIMED ARE DEFINED AS FOLLOWS:
1. An overlock machine comprising a bed frame, a fixed knife, a movable knife cooperating with said fixed knife to cut the edge of a cloth, a support member adapted to be coupled to a moving part of the machine for supporting said movable knife, and a lower looper provided rearwardly of said fixed knife and said movable knife, characterized in that said bed frame has a movable portion adapted to be moved to an inoperative position so as not to obstruct the viewing of and the access to said lower looper for the placement of a thread through said lower looper, at least one of said knife means being mounted on said movable portion of said bed frame, said movable portion being provided with engagement means for releasable engagement with a body portion of said bed frame.
2. An overlock machine as claimed in claim 1, wherein said fixed knife is mounted on said movable portion of the bed frame
3 An overlock machine as claimed in claim 2, wherein said movable knife and said support member for said movable knife are mounted on said movable portion of the bed frame.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA000508414A CA1264989A (en) | 1986-05-05 | 1986-05-05 | Overlock machine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA000508414A CA1264989A (en) | 1986-05-05 | 1986-05-05 | Overlock machine |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1264989A true CA1264989A (en) | 1990-01-30 |
Family
ID=4133060
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000508414A Expired - Fee Related CA1264989A (en) | 1986-05-05 | 1986-05-05 | Overlock machine |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA1264989A (en) |
-
1986
- 1986-05-05 CA CA000508414A patent/CA1264989A/en not_active Expired - Fee Related
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MKLA | Lapsed |