JP3656854B2 - Multi-head sewing machine - Google Patents

Description

[0001]
[Industrial application fields]
The present invention relates to a multi-head sewing machine in which a plurality of sewing heads are arranged side by side and sewing is performed by moving a balance in conjunction with the sewing heads.
[0002]
[Prior art]
A plurality of sewing heads each provided with a balance that can be moved up and down are provided side by side, and a rotatable main shaft is passed through each of the sewing heads. In each sewing head, the balance is moved up and down with respect to the main shaft. For this purpose, a cam is attached so that the main shaft penetrates the cam (see, for example, JP-A-61-167072).
[0003]
[Problems to be solved by the invention]
In this conventional multi-head sewing machine, when the cam is damaged in one of the sewing machines or when the cam is replaced to make it different in shape, the following troublesome work is required. was there. That is, in all of the plurality of sewing machines, all the cams attached to the main shaft are loosened from the main shaft, and then the main shaft is pulled out to the cam of the corresponding head. Next, a replacement cam is prepared at the corresponding head, and then the spindle is inserted through all the cams from which the spindle has been pulled out, including the replacement cam of the sewing machine. Pass through. Finally, all the loosened cams are fixed to the main shaft. As described above, there is a problem that requires a very laborious work.
[0004]
The present invention was made to solve the above-described problems (technical problems) of the prior art, and the cam can be attached and detached from the radial direction side of the main shaft so that any one of a plurality of sewing heads is used. The purpose of the present invention is to provide a multi-head sewing machine in which the replacement work can be extremely facilitated by replacing only the corresponding sewing machine head with a cam when the cam needs to be replaced.
[0005]
[Means for Solving the Problems]
In the multi-head sewing machine according to the present invention, a plurality of sewing heads each provided with a balance that can be moved up and down are provided side by side, and a rotatable main shaft 3 is passed through each of the sewing heads. On the other hand, in the multi-head sewing machine in which the cam 14 for moving the balance up and down is attached so that the main shaft 3 penetrates the cam 14.
The cam 14 in each of the sewing heads has a large cam element 25 having a cut 27 formed larger than the diameter of the main shaft 3 so that the main shaft 3 can pass through, and a small shape corresponding to the cut 27. In the state where the small cam element 26 is positioned at the cut 27 in the large cam element 25, the cam element 26 on the side is configured to be integrally connected so as to be separable from each other.
In addition, one surface of the cam 14 composed of the large cam element 25 and the small cam element 26 is fixed to the cam base 8 fixed to the main shaft 3. Both the cam element 25 and the small cam element 26 are fixed to the cam base 8 with the fixture 19, respectively.
Both sides of the cut 27 in the large cam element 25 are configured to be pressed against the cam base 8 by the overhang portions 29 provided on both sides of the small cam element 26.
[0006]
[Action]
When removing the cam from the main shaft, the cam can be removed from the main shaft by separating a plurality of cam elements in the radial direction of the main shaft. When the cam is mounted on the main shaft, it is mounted by the operation opposite to the above.
[0007]
【Example】
Hereinafter, drawings showing examples of the present application will be described. In FIG. 1 showing a multi-head sewing machine, 1 is a table, 2 is a sewing head disposed above the table, and a plurality of, for example, 2 to 24 heads are arranged in parallel. Reference numeral 3 denotes a main shaft provided so as to pass through each of the sewing heads 2. Each sewing head 2 has a structure equivalent to that disclosed in the above-mentioned Japanese Patent Laid-Open Nos. 61-167072 and 3-242195, and 4 is a needle bar which can be moved up and down, and a sewing needle at the lower end. 5 is provided. 6 is a balance which can be moved up and down. Although not shown, the sewing head 2 is provided with a needle bar driving mechanism for moving the needle bar 4 up and down by the rotation of the main shaft 3 and a balance driving mechanism for moving the balance 6 up and down by the rotation of the main shaft 3. Yes.
[0008]
Next, FIGS. 2 to 4 showing the balance driving cam and the related structure in the balance driving mechanism will be described. A cam base 8 is formed of a metal material and is fixed to the main shaft 3 as is well known. For example, an eccentric wheel of a crank mechanism in the needle bar drive mechanism is fixed to the main shaft 3, and the cam base 8 is screwed to the eccentric wheel. Reference numerals 9 and 10 denote screw holes for cam mounting provided on the base 8, and 11 denotes a pin hole for cam positioning. Next, reference numeral 14 denotes a cam for driving the balance, which is made of a synthetic resin material such as nylon resin and is attached to the cam base 8. Hereinafter, the structure of the cam 14 will be described. 15 is a spindle through hole, which is formed to be slightly larger than the diameter of the spindle 3. Reference numeral 16 denotes a cam groove, and reference numerals 17 and 18 denote attachment portions, both of which are formed as arc-shaped long holes with the center of the main shaft through hole 15 as the center. Reference numeral 19 denotes a mounting tool, for example, a hexagon socket head bolt is used for mounting the cam 14 to the cam base 8 via the mounting portions 17 and 18. The mounting portion 18 will be further described with reference to FIG. 4 (the mounting portion 17 has the same structure). Reference numeral 20 denotes a shaft through portion, which is formed wider than the diameter of the shaft portion 19a of the fixture 19 and narrower than the diameter of the head portion 19b. Reference numeral 21 denotes a head accommodating portion which is formed in a size sufficient to accommodate the head 19b of the fixture 19 in an embedded state. Reference numeral 22 denotes a washer, and the cam 14 is made of a synthetic resin material as described above, so that the low strength of the cam 14 is compensated. The metal material has a length corresponding to the bottom portion of the head receiving portion 21. It is formed in a circle. Reference numerals 23 shown in FIGS. 2 and 3 are positioning holes.
[0009]
Next, the cam 14 is constructed by integrally joining two mutually connectable and separable cam elements 25 and 26. 27 is a cut that separates both cam elements 25 and 26, and is provided so as to pass through the main shaft through hole 15. Next, the structure of the cut portions of the cam elements 25 and 26 will be described with reference to FIGS. 28 is an overhanging portion provided on the side of the attachment surface with respect to the base 8 in the cam element 25, and 29 is an overhanging portion provided on the edge of the other cam element 26 on the side opposite to the attachment surface. It is configured to overlap with the overhanging portion 28 of the element 25. Reference numeral 30 denotes a positioning pin hole drilled in the overhanging portion 28, and reference numeral 31 denotes a positioning pin attached to the overhanging portion 29, which is made of a metal material. The pin hole 30 and the pin 31 are provided at positions corresponding to each other. When the both are fitted, the cam elements 25 and 26 are positioned relative to each other, and the side wall of the cam groove 16 in these elements is smooth. It is supposed to be continuous. Reference numeral 34 shown in FIG. 2 is a balance driving lever in the balance driving mechanism, and a pivotal attachment portion 35 is pivotally attached to a shaft pin 36 screwed to the frame of the sewing machine. Reference numeral 37 denotes a driven lever integrated with the lever 34, and a follower 38 provided at the tip is positioned in the cam groove 16.
[0010]
In such a case, the cam 14 of each sewing head 2 rotates in conjunction with the rotation of the main shaft 3. As a result, in each sewing head, the follower 38 is displaced according to the cam groove 16, and the lever 34 moves in the direction of the arrow through the lever 37. As a result, the balance 6 moves up and down.
[0011]
Next, the operation when the cam 14 is damaged in any one of the multi-head sewing machines having the above-described configuration, or when the cam 14 is replaced with another having a different cam groove 16 shape will be described. In the corresponding sewing machine head 2, first, the attachments 19 of the attachment portions 17 and 18 are removed. Next, the cam element 26 is separated from the cam element 25 at the cut 27 and removed in the radial direction of the main shaft 3. Next, the cam element 25 is turned so that the follower 38 is taken out from the cam groove 16 to the place where the cam element 26 is removed, and the cam element 25 is removed in the radial direction of the main shaft 3. Next, when the new cam 14 is mounted, as shown in FIG. 5A, the cam element 25 is applied to the main shaft 3 from the side so that the main shaft 3 is positioned in the main shaft through hole 15. Next, the cam element 25 is turned along the base 8 while rotating so that the follower 38 enters the cam groove 16. Next, the other cam element 26 is integrally connected to the cam element 25 as shown in FIG. 5B using the pin hole 30 and the pin 31 for positioning. Next, a cam positioning pin carried by the operator in advance is fitted into the pin hole 11 through the positioning hole 23 to position the cam 14 with respect to the main shaft 3, that is, in the rotational direction. In this state, the cam 14 is fixed to the cam base 8 by the fixture 19, and the cam positioning pin is removed. This completes the cam 14 replacement. The above replacement may be performed with the balance driving lever removed.
[0012]
In the state where the cam 14 is attached to the cam base 8 by the mounting tool 19 as described above, the overhanging portion 29 of the small cam element 26 is replaced with the overhanging portion 28 of the large cam element 25 as shown in FIG. 8 is pressed. Therefore, even if the larger cam element 25 is attached to the cam base 8 at one place of the attachment portion 17, the portion remote from the attachment portion 17 is pressed against the cam base 8 by the overhanging portion 29 of the cam element 26, The element 25 is prevented from being lifted from the base 8 not only in the portion close to the mounting portion 17 but also in the portion far from the mounting portion 17.
[0013]
【The invention's effect】
As described above, in the present invention, when sewing is performed with a plurality of sewing heads 2, all the cams of each sewing head 2 are turned by turning the main shaft 3 penetrating all the cams 14 in each sewing head 2. Needless to say, 14 can be rotated and all the scales 6 of each sewing machine head 2 can be interlocked and moved up and down to sew.
[0014]
Even if the main shaft 3 passes through all the cams 14 of the plurality of sewing heads 2 as described above,
A large cam element 25 having a cut 27 formed so as to be larger than the diameter of the main shaft 3 to allow passage of the main shaft 3 and a small cam element 26 having a shape corresponding to the cut 27 described above Since the small cam element 26 is positioned at the cut 27 in the side cam element 25, the cam elements 26 are integrally connected to each other. The cam 14 can be removed and mounted from the radial direction side of the main shaft 3, and only a small amount of labor is required to replace only the cam 14 from the main shaft 3 penetrating the plurality of sewing heads 2 only in the corresponding head. There is an effect on the replacement work.
[0015]
In addition, in the present invention, the larger cam element 25 having the cut 27 that is formed larger than the diameter of the main shaft 3 to allow passage of the main shaft, and the smaller side corresponding to the cut 27 described above. The large cam element 25 is integrally connected to the large cam element 25 in a state where the small cam element 26 is positioned at the cut 27 in the large cam element 25, and the small cam element 25 is small. One side of the above-mentioned cam composed of the side cam element 26 is fixed to the cam base 8 fixed to the main shaft, and the fixed structure is such that both the large side cam element 25 and the small side cam element 26 are attached. It is fixed to the cam base 8 with the tool 19, and both sides of the cut 27 in the large cam element 25 are pressed against the cam base 8 by overhangs 29 provided on both sides of the small cam element 26. Because Both sides of the cut 27 in the large cam element 25 can be securely integrated by pressing the overhangs 29 provided on both sides of the small cam element 26, and the cam surface is smooth. There is an excellent effect that can be continued.
[Brief description of the drawings]
FIG. 1 is a front view schematically showing a multi-head sewing machine.
FIG. 2 is a view showing a relationship between a cam for driving a balance and a lever for driving the balance;
FIG. 3 is an exploded perspective view of a balance driving cam.
4 is a sectional view taken along line IV-IV in FIG.
FIGS. 5A and 5B are diagrams showing an assembling procedure of a balance driving cam with respect to a main shaft; FIGS.
[Explanation of symbols]
2 Sewing head 3 Spindle 6 Balance
14 Cam for driving the balance
16 Cam groove
25, 26 Cam element
27 breaks

Claims (1)

A plurality of sewing heads each provided with a balance that can be moved up and down are provided side by side, and a rotatable main shaft is passed through each of the sewing heads. In each sewing head, the balance is moved up and down with respect to the main shaft. In the multi-head sewing machine in which the cam for attaching the main shaft passes through the cam,
The cam in each of the sewing heads includes a large cam element having a cut formed so as to be larger than the diameter of the main shaft to allow passage of the main shaft, and a small cam element having a shape corresponding to the cut. In the state where the small side cam element is located at the cut in the large side cam element, it is configured to be integrally connected so as to be separable from each other,
In addition, one surface of the above-mentioned cam composed of the large-side cam element and the small-side cam element is fixed to the cam base fixed to the main shaft, and the fixing structure is small even for the large-side cam element. The cam elements on the side are also fixed to the cam base with fixtures,
A multi-head sewing machine characterized in that both sides of the cut in the large cam element are pressed against the cam base by overhang portions provided on both sides of the small cam element.

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