CN102002824B - Sewing device with an upper thread tension adjustment device - Google Patents

Sewing device with an upper thread tension adjustment device Download PDF

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Publication number
CN102002824B
CN102002824B CN 201010266744 CN201010266744A CN102002824B CN 102002824 B CN102002824 B CN 102002824B CN 201010266744 CN201010266744 CN 201010266744 CN 201010266744 A CN201010266744 A CN 201010266744A CN 102002824 B CN102002824 B CN 102002824B
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China
Prior art keywords
tension force
tension
spring
clamp
dial
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CN 201010266744
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CN102002824A (en
Inventor
河合泰典
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Aisin Corp
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Aisin Seiki Co Ltd
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Abstract

The invention provides a sewing device with an upper thread tension adjustment device. When operating a thread-gripping dial (dial), the operation quantity of the thread-gripping dial is more than one ring, the torsional moment change of the dial operation is smooth, the cost is also low and during the assembly process, the position in the upper thread tension adjustment range is easily finely tuned. A tension representation part (17) is arranged on a tension setting nut (16) screwed with an external thread part (11a) of an axle 911) and a change-over mechanism (8) for changing the rotation of the thread-gripping dial (19) into the screwed movement is formed by the tension setting nut (16) and the thread-gripping dial (19). A thread-gripping slice (12) at another end of the axle (11) and another thread-gripping slice (13) are used for gripping the upper thread (4) and the upper thread tension adjustment device (10) with a thread-gripping spring (15) and an operation stable spring (18) is fixed on a device foundation (2) and an indication groove (3a) is arranged on a shell (3) of the sewing device.

Description

Sewing machines with upper thread tension adjustment device
Technical field
The present invention relates to have the Sewing machines of the upper thread tension adjustment device of the tension force of reaching the standard grade for adjustment.
Background technology
As the Sewing machines with existing upper thread tension adjustment device, as shown in figure 14, disclose following Sewing machines 100 (partial graph of Sewing machines): it is fixed with tension disk 110 (upper thread tension adjustment device) by screw 103 on sewing machine base 101, so that the part of the operation dial 117 of tension disk 110 is provided with shell 102 (with reference to patent documentation 1) from the outstanding mode of the peristome 102a of outer cover 102.
Figure 15 is the key diagram of existing tension disk 110.As shown in figure 15, tension disk 110 has been fixed an end of the clamp axle 112 that is provided with the 112a of leading screw section at clamp 111.Be inserted with in order spring bearer plate 115, holddown spring 116 and the operation dial 117 that clamping is reached the standard grade and given a pair of thread tension disc 113,113, clamp spring 114 of tension force, fastens with the 112a of leading screw section from the other end of clamp axle 112.In order when assembling Sewing machines, to stop operation dial 117 to be provided with brake 118 from 112 disengagings of clamp axle.Clamp spring 114 is given a pair of thread tension disc 113,113 elastic force (below, be called spring load), and holddown spring 116 gives the operation dial 117 spring loads.Operation dial 117 has two cylinder parts of arranged coaxial, is provided with the groove 117a parallel with clamp axle 112 in the cylindrical portion of center side, fastens the periphery fore-end 115a that spring bearer plate 115 is arranged in groove 117a.Outer peripheral face in the outside that operates dial 117 records other numerical value of thread tension setting level in the expression, and the user rotates the operation dial in one encloses with interior scope.So spring bearer plate 115 is in the same manner rotation with it, and relatively operates dial 117 endwisely slipping along clamp axle 112.Thus, the distance that thread tension disc 113 and spring bearer plate are 115 changes, thereby the press load of thread tension disc 113 changes, and the tension force of reaching the standard grade is adjusted.
And, Sewing machines 100 with this tension disk can endwisely slip owing to operating dial 117 relative axles, therefore when the installation of outer cover 102, need not special anchor clamps, well-trained staff, prudent operation, the correction processing of Sewing machines support etc., thereby improved productivity ratio.Outer cover 102 is installed under the state of sewing machine base 101, the part of operation dial 117 is outstanding from the peristome 102a of outer cover 102, and its right end face 102b butt of the peristome 102a of its right end face 117b of Figure 14 of operation dial 117 and outer cover 102.
And, the device for adjusting tension of yarn of known Sewing machines as described below, it comprises: a pair of thread tension disc, clamping was reached the standard grade when it can be inserted into the clamp axle movably; The clamp gear, the external thread spiro fastening of itself and clamp axle; The clamp spring, it is located between thread tension disc and the clamp adjusting gear, gives thread tension disc and clamp gear clamp pressure; The clamp handle, it can be supported up or down along the guide portion that is formed on the sewing hood; The clamp driven wheel, it is fixed on the clamp pulley that rotates linkedly with the clamp handle in coaxial mode; Idler gear, it is located between clamp driven wheel and the clamp adjusting gear, with clamp driven wheel and the engagement of clamp adjusting gear; And Timing Belt, it is converted to moving up and down of clamp handle the rotation (with reference to patent documentation 2) of clamp pulley.
Patent documentation 1: Japanese kokai publication hei 08-309062 communique
Patent documentation 2: TOHKEMY 2000-210489 communique
But according to patent documentation 1, owing to the outer peripheral face of upper other numeric representation of thread tension setting level of expression at operation dial 117, therefore upward thread tension setting is limited in operating in the circle of dial 117.Thus, the amount of movement of the spring bearer plate 115 of clamp spring deflection also is limited, thereby is difficult to set extremely meticulously upper line tension.
And, owing to reason same as described above, under the state of the upper line tension maximum of guaranteeing to be scheduled to and minimum of a value, the operational ton (rotation amount) that upper line tension operates dial 117 relatively occurs sharply to change, and the lead angle of the 112a of leading screw section increases, thereby the rotation torque of operation dial 117 increases.As a result, be difficult to adjust to the desirable upper line tension of user.
And, the end face 102b butt of the end face 117b of operation dial 117 and the peristome 102a of outer cover 102.Therefore, the frictional force between end face 117b and the end face 102b causes that the rotation torque of operation dial 117 reduces, and significantly reduces so the spring load of holddown spring 116 is compared the spring load of clamp spring 114.Thereby the clamp spring 114 that causes acting on the spring bearer plate 115 is affected by the spring load of clamp spring 114 with the spring load that acts on the holddown spring 116.Therefore, more to the direction rotation operation dial 117 of strengthening upper line tension, clamp spring 114 is more compressed for the user, thereby the spring load that causes acting on the clamp spring 114 on the spring bearer plate 115 increases.Thereby when spring bearer plate 115 rotation, the spring load of opposing clamp spring 114 and increasing along power and the frictional force between external screw thread and the internal thread that the 112a of leading screw section moves sharply uprises thereby be used for torsional spring pressing plate 115 required torque values.Its result, the rotation torque of operation dial 117 that relatively operates the rotation amount of dial 117 change to increase.And, the rotation torque of the operation dial 117 when upper line tension is minimum is compared line tension step-down significantly when maximum, so in the rotating range of operation dial 117, the centre position (median of rotation torque) that relatively operates dial 117 becomes uneven.Owing to above reason, when the user operates operation dial 117, tension force setting operation difficult.
And, in order to eliminate the user in operational sense of discomfort, when the spring constant of holddown spring 116 was made as the spring constant degree of clamp spring 114, the rotation torque of the operation dial 117 of line tension became roughly consistent with the rotation torque of the operation dial 117 of minimum upper line tension on the maximum.But the frictional force of end face 117b increases, and has the noise of abnormal and causes that the user produces the problem of sense of discomfort.
And there is deviation in the size of the natural length of clamp spring 114, spring constant or spring bearer plate 115 in making.Therefore, when assembling in factory, the fine setting of the position of the tension adjustment scope that need to determine to reach the standard grade.But Sewing machines 100 does not possess this fine adjustment function, the fine setting difficult of the position of tension adjustment scope so decision is reached the standard grade.
And, according to patent documentation 2, owing to must possess the high parts of cost such as clamp driven wheel, clamp adjusting gear, idler gear and Timing Belt, and structure is also complicated, so the problem that exists the cost of device for adjusting tension of yarn to uprise.
Summary of the invention
The present invention makes in view of the above problems, its purpose is to provide a kind of Sewing machines with upper thread tension adjustment device, it is when operation clamp dial (operation dial), the operational ton of clamp dial can be more than a circle, and the change in torque of dial operation is mild, and rotation torque also reduces during operation, balance might as well, the adjustment of extremely careful upper line tension becomes easily, and cost is also low, easily the position of the tension adjustment scope of reaching the standard grade is finely tuned during assembling.
In order to solve above-mentioned problem, technical scheme 1 described invention is the Sewing machines with upper thread tension adjustment device, and wherein, this upper thread tension adjustment device comprises: the axle that is provided with external thread part; Drawer at movable side tensiometer indicating note, it is located at and screws togather with external thread part and can screw togather on the mobile tension force setting operating member; The clamp dial, it is installed in the distolateral of axle revolvably, has rotation is converted to the mobile switching mechanism that screws togather that tension force is set operating member; The fixation side thread tension disc, it is distolateral that it is located at another of axle; The drawer at movable side thread tension disc, it is inserted on the axle, reaches the standard grade with the clamping of fixation side thread tension disc; The clamp spring, it is located at the drawer at movable side thread tension disc and tension force is set between the operating member, and drawer at movable side thread tension disc and tension force setting operating member are applied respectively rightabout elastic force; The stable operation spring, it is located at the clamp dial and tension force is set between the operating member, and clamp dial and tension force setting operating member are applied respectively rightabout elastic force; And fixation side tensiometer indicating note, it is located on the fixed part of Sewing machines, by the rotation of clamp dial, makes tension force set operating member and screws togather movement, thereby determine the position of drawer at movable side tensiometer indicating note.
And, in technical scheme 2 described inventions, tension force is set operating member and is comprised the tension force expressed portion that is provided with drawer at movable side tensiometer indicating note, be located at setting side joint portion and the expression side joint portion snapping that is located on the tension force expressed portion on the tension force setting operating member, and press the tension force expressed portion by the elastic force of stable operation spring, and press compression and tension via expression side joint portion and setting side joint portion and set operating member, set the side joint portion and represent that the either party is provided with a plurality of vertically in the side joint portion on same circumference, the opposing party is provided with the number of lacking than a plurality of vertically on circumference, in the combination in a plurality of combinations of setting side joint portion and expression side joint portion snapping more than at least two groups, the distance that the tension force that the elastic force by the clamp spring is pressed is set between the face of the tension force expressed portion that the face of operating member and the elastic force by the stable operation spring is pressed is different.
And, in technical scheme 3 described inventions, tension force is set operating member and is comprised the tension force expressed portion that is provided with drawer at movable side tensiometer indicating note, be located at setting side joint portion and the expression side joint portion snapping that is located on the tension force expressed portion on the tension force setting operating member, and press the tension force expressed portion by the elastic force of clamp spring, and press compression and tension via expression side joint portion and setting side joint portion and set operating member, set the side joint portion and represent that the either party is provided with a plurality of vertically in the side joint portion on same circumference, the opposing party is provided with the number of lacking than a plurality of vertically on circumference, in the combination in a plurality of combinations of setting side joint portion and expression side joint portion snapping more than at least two groups, the distance that the tension force that the face of the tension force expressed portion that the elastic force by the clamp spring is pressed and the elastic force by the stable operation spring are pressed is set between the face of operating member is different.
And, in technical scheme 4 described inventions, the elastic force of the stable operation spring the when elastic force of the clamp spring the when tension force of reaching the standard grade is maximum rating and the tension force of reaching the standard grade are minimum state equates, the elastic force of the clamp spring the when elastic force of the stable operation spring the when tension force of reaching the standard grade is maximum rating and the tension force of reaching the standard grade are minimum state equates, and the spring constant of the spring constant of clamp spring and stable operation spring equates.
In the invention of technical scheme 1 record, when making the rotation of clamp dial, by switching mechanism, the rotation of clamp dial is converted to tension force that the external thread part with axle screws togather sets the rotation of operating member and axial movement (after, be called screw togather movement).Set moving axially of operating member by tension force, change the deflection to the clamp spring of the drawer at movable side thread tension disc application of force, thereby change the elastic force to the clamp spring of the drawer at movable side thread tension disc application of force.Thus, change with fixation side thread tension disc and the clamping of drawer at movable side thread tension disc reach the standard grade and each thread tension disc between frictional force, thereby the tension force that change is reached the standard grade.Because scoring, drawer at movable side tensiometer indicating note and the indicating of fixation side tensiometer be not located on the fixed part of tension force setting operating member and Sewing machines, therefore tension force is set the rotation of operating member by the clamp dial and is screwed togather movement, in the time of the rotation of expression groove to moving axially.Therefore, though the rotary manipulation amount of clamp dial because of rotation more than a circle, also can represent exactly the upper line tension of groove, therefore the Sewing machines of the upper thread tension adjustment device that rotary manipulation amount with clamp dial can be more than a circle can be provided.
In this situation, because the clamp dial can revolve and turn around abovely, so setting the shaft orientation moving range of operating member, tension force increases.Therefore, in the identical scope of the peak to peak of upper line tension, can set more meticulously the tension value of reaching the standard grade compared to existing technology.
And, because the clamp dial can revolve and turn around abovely, so the variable quantity of the rotary manipulation amount (rotation amount) of the upper relative clamp dial of line tension becomes mild characteristic, thereby can be desirable value with the tension adjustment of reaching the standard grade easily.
And, according to above-mentioned reason, under the identical state of the variable quantity of the rotary manipulation amount of the relative clamp dial of upper line tension, can increase compared to existing technology the maximum of upper line tension, the tension adjustment scope broadens, and can easily make thick cloth.
And then, since clamp dial and tension force set operating member can revolve turn around above, therefore in the scope of the peak to peak of upper line tension situation same as the prior art, the spring bearer plate in compared to existing technology can reduce the lead angle that tension force is set the external thread part of operating member.Thus, the variable quantity of the rotary manipulation amount of the relative clamp dial of upper line tension becomes mild, and the maximum of upper line tension is guaranteed to be predetermined value, and can reduce than prior art making tension force setting operating member screw togather mobile revolving force, reduce so have the rotation torque of its clamp dial of Sewing machines of upper thread tension adjustment device of the present invention.
As mentioned above, can provide the variable quantity rotation torque mild and the clamp dial of line tension to reduce, the extremely careful adjustment of upper line tension is easy, and the maximum of tension adjustment wide ranges and upper line tension is large, can easily make the Sewing machines with upper thread tension adjustment device of thick cloth.
And wire tension adjustment arrangement of the prior art must possess the high parts of cost such as clamp driven wheel, clamp adjusting gear, idler gear and Timing Belt, and mechanism is also complicated.But upper thread tension adjustment device of the present invention does not use the high parts of above-mentioned cost, and structure is also simple, therefore has the cost of the Sewing machines of upper thread tension adjustment device of the present invention.
And, in the invention of technical scheme 2 records, tension force is set operating member and is comprised the tension force expressed portion that is provided with drawer at movable side tensiometer indicating note, be located at setting side joint portion and the expression side joint portion snapping that is located on the tension force expressed portion on the tension force setting operating member, and press the tension force expressed portion by the elastic force of stable operation spring, and come to set operating member by compression and tension via expression side joint portion and setting side joint portion.Thus, set the side joint portion and represent that the side joint portion is combined.Therefore, press the elastic force of the stable operation spring of tension force expressed portion by opposing, and apply larger power by this elastic force to the tension force expressed portion, so the expression side joint portion of being combined with setting side joint portion can break away from from setting the side joint portion.
When assembling, be in and represent that the side joint portion is made as the state that breaks away from from setting the side joint portion.Under the state of line tension in the setting, in order to aim at fixation side tensiometer indicating note and the indicating of drawer at movable side tensiometer note, with to the tension force of should reaching the standard grade, select the combination of the combination of setting side joint portion and expression side joint portion, thereby make expression side joint portion and setting side joint portion snapping.Owing to having adjusted the distance between the face of the tension force pressed by the elastic force of clamp the spring face of setting operating member and the tension force expressed portion of pressing by the elastic force of stable operation spring, therefore can carry out natural length, spring length, tension force to the clamp spring and set operating member, fixation side thread tension disc and the movably fine setting that absorbs of the dimensional discrepancy in the making of thread tension disc.Its result can provide the Sewing machines of the upper thread tension adjustment device of the fine adjustment function with the position that possesses the tension adjustment scope of reaching the standard grade required when determining to assemble in factory.
And, in the invention of technical scheme 3 records, tension force is set operating member and is comprised the tension force expressed portion that is provided with drawer at movable side tensiometer indicating note, be located at setting side joint portion and the expression side joint portion snapping that is located on the tension force expressed portion on the tension force setting operating member, and press the tension force expressed portion by the elastic force of clamp spring, and come to set operating member by compression and tension via expression side joint portion and setting joint portion.Thus, set the side joint portion and represent that the side joint portion is combined.Therefore, press the elastic force of the clamp spring of tension force expressed portion by opposing, and apply larger power by this elastic force to the tension force expressed portion, the expression side joint portion of being combined with setting side joint portion can break away from from setting the side joint portion.
When assembling, be in and represent that the side joint portion is made as the state that breaks away from from setting the side joint portion.Under the state of line tension in the setting, in order to aim at the position of fixation side tensiometer indicating note and the indicating of drawer at movable side tensiometer note, with corresponding its load, select the combination of the combination of expression side joint portion and setting side joint portion, make the expression side joint portion of tension force expressed portion and the setting side joint portion snapping that tension force is set operating member.Because the face of having adjusted the tension force expressed portion of pressing by the elastic force of clamp spring and the tension force of pressing by the elastic force of stable operation spring are set the distance between the face of operating member, natural length, spring constant, tension force expressed portion, the tension force that therefore can carry out the clamp spring are set the fine setting that operating member, fixation side thread tension disc and the drawer at movable side thread tension disc dimensional discrepancy in making absorbs.Its result can provide the Sewing machines of the upper thread tension adjustment device of the fine adjustment function with the position that possesses the tension adjustment scope of reaching the standard grade required when determining to assemble in factory.
And, in the invention of technical scheme 4 records, the elastic force of the stable operation spring the when elastic force of the clamp spring when upper line tension is maximum rating is minimum state with upper line tension equates, be Fmax, the elastic force of the clamp spring the when elastic force of the stable operation spring when upper line tension is maximum rating is minimum state with upper line tension equates, be Fmin, and the spring constant of the spring constant of clamp spring and stable operation spring equates.Set the elastic force F that the operating member effect has the clamp spring at tension force 1With relative elastic force F 1The elastic force F of rightabout stable operation spring 2The F=(F that makes a concerted effort 1-F 2).Therefore, under the maximum rating and minimum state of upper line tension, the absolute value of the F that makes a concerted effort becomes (Fmax-Fmin).Under the intermediateness of the maximum rating of upper line tension and minimum state, the F that makes a concerted effort becomes 0.Namely, the absolute value of the F that makes a concerted effort of the rotation amount of relative clamp dial, become when the anglec of rotation of the clamp dial corresponding with the maximum rating of upper line tension and minimum state (Fmax-Fmin), (intermediateness of upper line tension) becomes 0 during the median of the rotation angle range of clamp dial.Therefore, the relative absolute value of the F that makes a concerted effort of the rotation amount of the clamp dial shape that is in the shape of the letter V, the median of the rotation angle range of clamp dial keeps balance relatively.Make the power of clamp dial rotation, have the opposing F that makes a concerted effort to make tension force set operating member to screw togather mobile required revolving force and set the frictional force F of operating member (comprising the tension force expressed portion) and the deadweight generation of clamp dial by tension force along the external thread part of axle 0Frictional force F by the deadweight generation 0Be certain value, so the absolute value of the rotation torque T of relative clamp dial, F is the same with making a concerted effort, the shape that is in the shape of the letter V, and the median of the rotation angle range of clamp dial keeps balance relatively.Its result, during line tension, the user can cosily adjust the tension force of reaching the standard grade to the Sewing machines with upper thread tension adjustment device of the present invention on adjusting.
Description of drawings
Fig. 1 is near the perspective view that has the clamp dial of Sewing machines of upper thread tension adjustment device of the embodiment of the invention.
Fig. 2 is the decomposition diagram of the upper thread tension adjustment device of Fig. 1.
Fig. 3 is the cutaway view of the upper thread tension adjustment device of Fig. 2.
Fig. 4 is the key diagram that the tension force of Fig. 3 is set the joint portion between nut and tension force expressed portion.
Fig. 5 is the part expanded view that the tension force of Fig. 4 is set the cylindrical portion outer peripheral face of nut.
Fig. 6 is the perspective view that the tension force of Fig. 3 is set the installation instructions of nut and clamp dial.
Fig. 7 is the A-A line cutaway view of Fig. 3.
Fig. 8 is the part expanded view of cylindrical portion outer peripheral face of the tension force expressed portion of Fig. 3.
Fig. 9 is the key diagram of the upper thread tension setting expressed portion of Fig. 3.
Figure 10 is the figure of the rotation torque of the spring load of clamp spring, stable operation spring of the upper thread tension adjustment device of presentation graphs 3 and clamp dial.
Figure 11 is the figure of the rotation torque of the spring load of clamp spring, the holddown spring of the tension disk of expression prior art and operation clamp dial.
Figure 12 is the cutaway view of the upper thread tension adjustment device of modified embodiment of the present invention.
Figure 13 is the key diagram that the tension force of Figure 12 is set the joint portion between nut and tension force expressed portion.
Figure 14 be prior art with near the key diagram the tension disk of the Sewing machines of tension disk.
Figure 15 is the cutaway view of the tension disk of Figure 14.
Label declaration:
1,9 Sewing machiness
3 Sewing machines shells (fixed part)
3a indicates groove (fixation side tensiometer indicating note)
4 reach the standard grade
5,40 upper thread tension adjustment devices
8,44 switching mechanisms
11 axles
The 11a external thread part
11b end face (other end)
11c end face (end)
12 thread tension discs (fixation side thread tension disc)
13 thread tension discs (drawer at movable side thread tension disc)
15 clamp springs
16,41 tension force are set nut (tension force setting operating member)
16ba, 17ba, 42ba face
16e, 41e breach recess (setting the side joint portion)
17,42 tension force expressed portions
17c, 42c breach protuberance (expression side joint portion)
17d, 42d represent groove (drawer at movable side tensiometer indicating note)
18 stable operation springs
19 clamp dials
41 ca end faces (face)
The specific embodiment
Below, with reference to accompanying drawing, embodiments of the invention are elaborated.
Fig. 1 represents to have near the perspective view the clamp dial of Sewing machines of upper thread tension adjustment device of the present embodiment, and Fig. 2 represents the decomposition diagram of upper thread tension adjustment device shown in Figure 1.As shown in Figure 1, the Sewing machines 1 of the present embodiment has upper thread tension adjustment device 5, and an end of the axle 11 of upper thread tension adjustment device 5 (Fig. 2, Fig. 3) is fixed on the support 2 of Sewing machines 1.The clamp dial 19 that makes upper thread tension adjustment device 5 is during to the upper direction of Fig. 1 or lower direction rotation, the tension force expressed portion 17 of upper thread tension adjustment device 5 moves to left side or the right side of Fig. 1 pro rata with the anglec of rotation of clamp dial 19, and the tension force of reaching the standard grade is adjusted.The upper expression of the top 3b of the opening portion of Sewing machines shell 3 (fixed part) and bottom 3c has indication groove 3a (fixation side tensiometer indicating note), in tension force expressed portion 17 expression expression groove 17d (drawer at movable side tensiometer indicating note) is arranged, the tension force of reaching the standard grade that sets with the expression groove 17d formation of the location matches of indication groove 3a.
As shown in Figure 2, upper thread tension adjustment device 5 comprises: tension adjustment section 10, and it is adjusted by the tension force of thread tension disc 12 (fixation side thread tension disc) and thread tension disc 13 (drawer at movable side thread tension disc) clamping reach the standard grade 4 (Fig. 3); And loose ends section 30, make the relative thread tension discs 12 of thread tension disc 13 separate to come and 4 install and remove reaching the standard grade.
Loose ends section 30 has loose ends action plate 31 and braked wheel 32, and the hole 31a of loose ends action plate 31 inserts the axle 2a on the support 2 that is located at Sewing machines 1, at axle 2a braked wheel 32 is installed, and breaks away from from axle 2a to stop loose ends action plate 31.Configuration also relies on the fore-end (not shown) of the bar of front end than the front end of pressing lever 6 (Fig. 1) in the groove 31b of loose ends action plate 31.Thus, when pressing lever 6 is moved upward, also rely on the fore-end of bar of front end and the claw 31b butt of loose ends action plate 31 than the front end of pressing lever 6, thereby loose ends action plate 31 is that pivot rotates with axle 2a.When loose ends action plate 31 rotates, the application point 31d of loose ends action plate 31 and the service portion 13a butt of giving prominence to from the outer circumferential side of thread tension disc 13, thus between thread tension disc 13 and thread tension disc 12, produce the gap.Thus, can install and remove and reach the standard grade 4.When making pressing lever 6 return-to-home position, thread tension disc 13 return-to-home positions.
Fig. 3 represents the cutaway view of upper thread tension adjustment device shown in Figure 25, the maximum set condition of line tension in Fig. 3 (a) expression, the minimum set condition of line tension in Fig. 3 (b) expression.As shown in Figures 2 and 3, tension adjustment section 10 comprise that axle 11, thread tension disc 12, thread tension disc 13, spring support 14, clamp spring 15, tension force set that nut 16, tension force are set tension force expressed portion 17, stable operation spring 18, clamp dial 19 that nut 16 possesses, the plain washer 20 on the cylindrical portion 19c two ends that are located at clamp dial 19,20 and be installed in braked wheel 21 on the groove 11d of end 11c (end) side of axle 11.
The end 11b (other end) that the axle 11 of thread tension disc 12 has been installed is fixed on the support 2, and thread tension disc 12 is clamped by support 2 and axle 11 thus.Middle body at axle 11 is provided with external thread part 11a, and the tension force that screws togather of external thread part 11a sets on the axle 11 between nut 16 and the thread tension disc 12, is inserted with successively thread tension disc 13, spring support 14 and clamp spring 15.Under this state, the face 14a of the two ends of clamp spring 15 and spring support 14 and tension force are set the face 16ba butt of nut 16, and thread tension disc 13 is endowed the elastic force (after, be called spring load) of clamp spring 15 via spring support 14.Thus, thread tension disc 13 and thread tension disc 12 butts reach the standard grade 4 by thread tension disc 12 and thread tension disc 13 clampings.When tension force is set nut 16 rotation, distance L 1 between face 14a and the face 16ba changes, thereby the spring load of pressing the clamp spring 15 of thread tension disc 13 also changes, reach the standard grade 4 and thread tension disc 12,13 between frictional force change, thereby 4 the tension force of reaching the standard grade changes.That is, during the frictional force increase and decrease, the tension force increase and decrease.
Fig. 4 is the key diagram that tension force is set the joint portion of nut 16 and tension force expressed portion 17, has wherein omitted axle 11.Among the figure, the B-B line section of Fig. 4 (b) presentation graphs 4 (a), the root of the fine rule of Fig. 4 (b) * mark indication notch recess 16e (setting the side joint portion).In addition, the root with the breach recess 16e of breach protuberance 17c (the expression side joint portion) engagement of hereinafter explanation is to have deleted * mark.Shown in Fig. 4 (a), tension force set nut 16 by cylindrical portion 16a, have at the boss portion 16b of the internal thread 16d of the inboard coaxial setting of cylindrical portion 16 and connect the 16c of plectane section of cylindrical portion 16a and boss portion 16b and form, and have with cylindrical portion 16a in the tension force expressed portion 17 that connects.The face 16ba of the sunk part of boss portion 16b and the end face butt of clamp spring 15, tension force is set the internal thread 16d of nut 16 and the external screw thread 11a of axle 11 screws togather.
Fig. 5 is the part expanded view that tension force is set the cylindrical portion 16a outer peripheral face of nut 16.As shown in Figure 4, on the right side in Fig. 4 of cylindrical portion 16a (a), the central angle that forms as start line to right rotation take C line (Fig. 4 (b)) is provided with when increasing gradually apart from the distance H of face 16ba equidistantly a plurality of breach recess 16e of configuration in 180 ° scope.Formed the set of one group of breach recess by these a plurality of breach recess 16e.As shown in Figure 5, set under the state of outer peripheral face of cylindrical portion 16a of nut 16 launching tension force, in the scope (central angle is 180 °) of (circumferential length)/2, connect the root of a plurality of breach recess 16e and the line at top and consist of respectively the straight line with same tilt degree.The outer peripheral face of cylindrical portion 16a is that to dispose two groups of central angles that depart from 180 ° be the set (Fig. 4 (b)) of the breach recess 16e of 180 ° of scopes.A pair of breach recess 16e, 16e depart from 180 ° of angles at circumference thus, and the right side in Fig. 4 of cylindrical portion 16a (a) is provided with many group breach recess 16e, 16e.Each distance H apart from face 16ba of a pair of breach recess 16e, 16e, H equate.
Such as Fig. 4 (a) and (b), tension force expressed portion 17 comprises cylindrical portion 17a; The ring-type plectane 17b of section of the axial mid portion of cylindrical portion 17a inner peripheral surface; Extend to the left side of Fig. 4 of the ring-type plectane 17b of section and from the inner peripheral surface of cylindrical portion 17a slightly a pair of breach protuberance 17c, the 17c of projection.A pair of breach protuberance 17c, 17c be located at cylindrical portion 17a inner peripheral surface mutually depart from 180 ° position, and each distance from each front end to face 17ba of a pair of breach protuberance 17c, 17c equates.The end face of butt stable operation spring 18 on the face 17ba of the sunk part of the ring-type plectane 17b of section.Left side inner peripheral surface among Fig. 4 of the cylindrical portion 17a of tension force display part 17 and tension force are set the outer peripheral face butt of the cylindrical portion 16a of nut 16, and tension force is set a pair of breach recess 16e, the 16e of nut 16 and a pair of breach protuberance 17c, the 17c engagement of tension force expressed portion 17.So, tension force setting nut 16 has tension force expressed portion 17.The breach recess 16e that breach protuberance 17c meshes not simultaneously, the face 16ba that tension force is set nut 16 is different from the distance L 3 of the face 17ba of tension force expressed portion 17.
The engagement of breach recess 16e and breach protuberance 17c and form joint portion 7.By joint portion 7, the rotation of tension force being set nut 16 passes to tension force expressed portion 17, by the spring load of stable operation spring 18, press breach recess 16e via breach protuberance 17c, thereby being set moving axially of nut 16, tension force passes to tension force display part 17.Thus, tension force display part 17 is set nut 16 at tension force and is screwed togather when mobile and be integrally formed with it, thereby also to identical direction rotation and to moving axially.
As shown in Figure 3, the right-hand end in Fig. 3 of axle 11 external thread part 11a is inserted with plain washer 20, clamp dial 19 and plain washer 20 in order.Clamp dial 19 is owing to the braked wheel 21 on the groove 11d that is installed in axle 11, and its disengaging from axle 11 is prevented from, and can freely rotation centered by axle 11.
Tension force represents between the face 19b of the face 17ba of the tension force expressed portion 17 that nut 16 possesses and clamp dial 19 inboards, the outer peripheral face of the cylindrical portion 19c of clamp dial 19 is provided with stable operation spring 18 as spigot surface, the both ends of the surface of stable operation spring 18 and face 17ba and face 19b butt.Clamp dial 19 is pressed because of the spring load of stable operation spring 18, so between clamp dial 19 and plain washer 20, can produce the frictional force that is caused by this spring load, but by using sliding material at plain washer 20, significantly reduced frictional force.
Fig. 6 sets the perspective view of the installation of nut 16 and clamp dial 19 for explanation tension force.The A-A line cutaway view of Fig. 7 presentation graphs 3 has omitted stable operation spring 18 among the figure.As shown in Figure 3, on clamp dial 19, between cylindrical portion 19a and cylindrical portion 19c, be provided with slide rail 19d.Such as Fig. 4, Figure 6 and Figure 7, slide rail 19d connects the slotted hole 17bb (Fig. 7) of the circular shape on the ring-type plectane 17b of section be located at tension force expressed portion 17 and is located at the hole 16g (Fig. 4) on the 16c of plectane section of tension force setting nut 16 and is inserted on the sliding-rail groove 16f on the inner peripheral surface that is located at cylindrical portion 16a.Form switching mechanism 8 (Fig. 6) by slide rail 19d and sliding-rail groove 16f chimeric.Owing to being provided with switching mechanism 8, when rotation clamp dial 19, sliding-rail groove 16f slides along slide rail 19d, thereby the band dynamic tension is set nut 16 rotations, and is moving axially with the relative clamp dial 19 in anglec of rotation composition ground of clamp dial 19.
Wherein, sliding-rail groove 16f can be located at tension force and sets on the tension force expressed portion 17 that nut 16 possesses.In addition, slide rail 19d can be located at tension force and set on nut 16 or the tension force expressed portion 17, and sliding-rail groove 16f is located on the clamp dial 19.
Below, the arrestment mechanism that the rotation that makes clamp dial 19 is stopped to describe.As shown in Figure 2, be provided with the brake 2b that vertically erects from face 2c at support 2, brake 2b passes each groove 12a, 13b, the 14b of thread tension disc 12, thread tension disc 13 and spring support 14 and outstanding from the face 14a (Fig. 3) of spring support 14.
Fig. 8 represents the part expanded view of the cylindrical portion 17a outer peripheral face of tension force expressed portion 17.As shown in Figure 8, the end face 17e of cylindrical portion 17a forms the rectilinear form of end face 17i (Fig. 3, Fig. 4) inclination of relative cylindrical portion 17a upon deployment.Thus, as shown in Figures 3 and 4, form the notch portion 17f of a circle helix shape at the end face 17e of the cylindrical portion 17a of tension force expressed portion 17, notch portion 17f forms the brake face 17g (arrow of Fig. 8 between scope W) parallel with brake 2b.In the tension force setting range, between the front end of the end face 17i of notch portion 17f and brake 2b, be provided with the gap.When the direction rotation clamp dial 19 that the spring load that makes clamp spring 15 increases, shown in Fig. 3 (a), the brake face 17g of tension force expressed portion 17 and brake 2b butt and the rotation of clamp dial 19 is stopped, upper line tension becomes maximum rating.
On the other hand, when the direction rotation that the spring load that makes clamp dial 19 to clamp spring 15 reduces, shown in Fig. 3 (b), the end face 17i of tension force expressed portion 17 and the face 19b butt of clamp dial 19 and the rotation of clamp dial 19 is stopped, upper line tension becomes minimum state.The anglec of rotation more than 360 ° (circles) of the minimum of a value that clamp dial 19 is guaranteed upper line tension till the maximum.And brake 2b also has both the function that stops thread tension disc 13 and spring support 14 rotations by each groove 13b, 14b (Fig. 2) butt with thread tension disc 13, spring support 14.
At this, clamp spring 15 is set identically with the spring constant of stable operation spring 18.And, the spring load F of the clamp spring 15 under the upper line tension maximum rating 1The spring load F of the stable operation spring 18 under max and the upper line tension minimum state 2Max is configured to identical value Fmax, and the spring load F of the clamp spring 15 under the upper line tension minimum state 1The spring load F of the stable operation spring 18 under min and the upper line tension maximum rating 2Min also is configured to identical value Fmin.In the present embodiment, set Fmin=0.
Fig. 9 is the key diagram of upper thread tension setting expressed portion.Such as Fig. 1, Fig. 3 and shown in Figure 9, upper thread tension setting expressed portion is set tension force expressed portion 17 that nut 16 possesses and Sewing machines shell 3 by tension force and is formed.Be provided with the indication groove 3a that consists of benchmark at the top 3b of the opening portion of Sewing machines shell 3 and the outer surface of bottom 3c.And, be provided with a plurality of expression groove 17d that spread all over a circle at the outer peripheral face of the cylindrical portion 17a of tension force expressed portion 17.Expression groove 17d represents the thread tension setting rank, and the position that rotation clamp dial 19 makes expression groove 17d is during to the position movement of indication groove 3a, and this expression groove 17d represents the setting value of upper line tension at this moment.In the present embodiment, the expression groove 17d in the left side of Fig. 3 represents that the expression groove 17d on minimum, right side represents maximum, be provided with three expression groove 17d between minimum and peaked expression groove 17d, but the number of expression groove 17d is not limited to this.And, at the outer peripheral face of cylindrical portion 17a numeral or illustration etc. can be set, to substitute the expression groove 17d that spreads all over a circle.
In addition, in the present embodiment, indication groove 3a is located on the Sewing machines shell 3, and expression groove 17d is located on the tension force expressed portion 17, but indication groove 3a can also be located on the tension force expressed portion 17, will represent that groove 17d is located on the Sewing machines shell 3.That is, spread all over the indication groove of a circle in the outer peripheral face setting of the cylindrical portion 17a of tension force expressed portion 17, and at least one party's of the top of Sewing machines 3 3b or bottom 3c outer surface a plurality of expression grooves are set.
And, as shown in Figure 3, Figure 4, tension force expressed portion 17 arranges the outstanding fine setting pawl 17j from the end face 17i of cylindrical portion 17a, and fine setting pawl 17j pass through openings is opened the groove 19e (Fig. 1) of the circular shape on the face 19b of clamp dial 19, and outstanding from clamp dial 19.When factory assembles, under the state of line tension in the setting, crawl fine setting pawl 17j, make a pair of breach protuberance 17c, the 17c of tension force expressed portion 17 and tension force set a pair of breach recess 16e, the 16e engagement of nut 16, indicate groove 3a so that the expression groove 17d of the tension force expressed portion 17 corresponding with the load of the clamp spring 15 of realizing this upper line tension shifts to.When carrying out this fine setting, near the slide rail 19d that avoids wire clamp line dial 19, the slotted hole 17bb (Fig. 7) of circular shape is set at the ring-type plectane 17b of section of tension force expressed portion 17.
In addition, the upper thread tension adjustment device 5 of the present embodiment arranges fine setting pawl 17j in tension force expressed portion 17, but fine setting pawl 17j can be set, insert the hole that pin etc. is finely tuned but arrange at cylindrical portion 16a, or sectional fixture be finely tuned on expression groove 17d.
Below, action and the effect of the related Sewing machines 1 of embodiments of the invention described.
Pressing lever 6 is moved to the top of Fig. 1, in the gap that produces between thread tension disc 12 and the thread tension disc 13, insert and reach the standard grade 4, make pressing lever 6 turn back to original position, reach the standard grade 4 with thread tension disc 12 and thread tension disc 13 clampings.Then, in order to set desirable upper line tension for, for example clamp dial 19 is carried out the rotary manipulation of upper direction in Fig. 1.By this rotary manipulation, tension force set nut 16 via the slide rail 19d of switching mechanism 8 and sliding-rail groove 16f to spring support 14 direction rotations, and to moving axially.That is, tension force is set nut 16 and is screwed togather movement near spring support 14 ground.Above-mentioned tension force is set the movement that screws togather of nut 16, passes to tension force expressed portion 17 via breach recess 16e and the breach protuberance 17c of joint portion 7, tension force expressed portion 17 too, in the time of rotation to moving axially.Thus, the length L 1 of clamp spring 15 shortens, the spring load that acts on the clamp spring 15 on the thread tension disc 13 via spring support 14 increases, by thread tension disc 12 and thread tension disc 13 clampings reach the standard grade 4 with thread tension disc 12,13 between frictional force also increase, thereby reach the standard grade 4 tension force increase.On the other hand, length L 2 elongations of stable operation spring 18, spring load reduces.
And, clamp dial 19 is carried out the rotary manipulation of the lower direction in Fig. 1.Tension force is set nut 16 and tension force expressed portion 17 screws togather movement to direction contrary to the above.Thus, tension force set nut 16 from spring support 14 discretely to moving axially.Thus, 1 elongation of the length L of clamp spring 15, the spring load that acts on the clamp spring 15 on the thread tension disc 13 via spring support 14 reduces, reach the standard grade 4 with thread tension disc 12,13 between frictional force reduce, thereby reach the standard grade 4 tension force minimizing.At this moment, the length L 2 of stable operation spring 18 shortens, and spring load increases.As mentioned above, the user is rotated will reach the standard grade 4 tension force of operation to clamp dial 19 and sets desirable value for.
In the Sewing machines 100 of prior art, because other numeric representation of expression thread tension setting level is operating on the dial 117, therefore upper other scope of thread tension setting level is limited in the circle.But, the Sewing machines 1 of the present embodiment, because the expression groove 17d of upper thread tension setting level range is located at tension force and sets on the outer peripheral face of the tension force expressed portion 17 that nut 16 possesses, so rotation by clamp dial 19, tension force is set nut 16 and is screwed togather movement, when expression groove 17d rotates to moving axially.Therefore, though the rotary manipulation amount of clamp dial 19 because of rotation one the circle more than, also can represent exactly the upper line tension of expressed portion 17d, thus can provide clamp dial 19 the rotary manipulation amount can one the circle more than upper thread tension adjustment device 5.
Because clamp dial 19 can revolve and turn around abovely, increases so tension force is set the axial moving range of nut 16.Therefore, in the identical scope of the peak to peak of upper line tension, compared to existing technology, can set extremely meticulously the tension value of reaching the standard grade.
And the rotary manipulation amount of clamp dial 19 can be more than a circle, and the variable quantity of going up thus the relative rotary manipulation amount of line tension becomes mild characteristic.And, according to identical reason, compared to existing technology, in upper other same range as of thread tension setting level of the peak to peak of upper line tension, can set extremely meticulously line tension, can be desirable value with the tension adjustment of reaching the standard grade easily.And then when the variable quantity of the rotary manipulation amount of the relative clamp dial 19 of upper line tension was identical, because the maximum of upper line tension increases compared to existing technology, so the Sewing machines 1 of the present embodiment 1 can easily be made thick cloth, and the tension adjustment scope became wide.
And then, since the tension force of the present embodiment set nut 16 can revolve turn around above, so when the scope of the peak to peak of upper line tension is same as the prior art, can reduce the lead angle that tension force is set the external thread part 11a of nut 16 than the spring 115 of prior art.Thus, the variable quantity of the rotary manipulation amount of the relative clamp dial 19 of upper line tension becomes mild, and the maximum of upper line tension can be guaranteed to be predetermined value, and reduce compared to existing technology making tension force setting nut 16 screw togather mobile revolving force, so the rotation torque of clamp dial 19 reduces.
As mentioned above, because the variable quantity of upper line tension becomes mild, and the rotation torque of clamp dial 19 reduces, therefore can provide and to carry out the adjustment of extremely careful upper line tension, the tension adjustment scope is also wide, and the maximum of upper line tension is large, can easily make the Sewing machines with upper thread tension adjustment device 51 of thick cloth.
And, the end face of setting the cylindrical portion 16 of nut 16 at tension force is provided with the set of one group of breach recess 16e, described one group of breach recess is formed by the different breach recess 16e of distance of the face 16ba that distance clamp spring 15 is pressed, and organizes being integrated into of breach recess 16e more and depart from 180 ° of angles on the same circumference.With a pair of breach protuberance 17c, the 17c of these a pair of breach recess 16e, 16e engagement inner peripheral surface projection from the cylindrical portion 17a of tension force expressed portion 17, and depart from ground, 180 ° of angles at same circumference and arrange.When factory assembles, under the state of line tension in the setting, crawl is located at the fine setting pawl 17j on the tension force expressed portion 17, make a pair of breach protuberance 17c, the 17c of tension force expressed portion 17 and tension force set a pair of breach recess 16e, the 16e engagement of nut 16, indicate groove 3a so that the expression groove 17d corresponding with the load of the clamp spring 15 of realizing this upper line tension shifts to.Therefore, can carry out the natural length of clamp spring 15 and spring constant, tension force are set the fine setting that nut 16, tension force expressed portion 17, spring support 14 and thread tension disc 12,13 the deviation of size on making absorb.The Sewing machines 1 of the upper thread tension adjustment device 5 of the fine adjustment function with the position that possesses the tension adjustment scope of reaching the standard grade required when determining to assemble in factory can be provided as a result.
And, in the present embodiment, the tension force expressed portion 17 that has represented groove 17d possesses on tension force setting nut 16, during assembling in order in the tension adjustment scope of reaching the standard grade, to finely tune, connect in the outer peripheral face of the inner peripheral surface of the cylindrical portion 17a of tension force expressed portion 17 and tension force setting nut 16, and the spring load that utilizes stable operation spring 18 makes breach recess 16e and breach protuberance 17c combination, sets nut 16 thereby consist of tension force.But, be not limited to this structure, for example can make in the inner peripheral surface of tension force expressed portion of the drum that has represented groove 17d and the outer peripheral face that tension force is set nut 16 to connect, and in the tension force expressed portion trip bolt is set.In this situation, after the fine setting in the tension adjustment of the reaching the standard grade during assembling scope finishes, with trip bolt the tension force expressed portion is fixed to tension force and sets on the nut 16.Thus, the tension force expressed portion that tension force setting nut and tension force setting nut possess does not all need breach recess 16e and breach protuberance 17c, and it is simple that structure becomes.And, except the method that is fixed by trip bolt, also can be fixed by bonding.And then, as substituting of the tension force expressed portion 17 that has represented groove 17d, can also paste the strip of paper used for sealing of expression expression line.
And, also can increase tension force and set the external diameter of nut 16 and directly at outer peripheral face expression groove 17d is set.In this situation, the structure that tension force is set nut (action of tension force configuration part) becomes simply, but lacks the fine adjustment function of upper line tension.
And other wire tension adjustment arrangements of the prior art are owing to must possess the high parts of cost such as clamp driven wheel, clamp adjusting gear, idler gear and Timing Belt, and structure is complicated also.But the upper thread tension adjustment device 5 of the present embodiment does not use the high parts of above-mentioned cost, and structure also becomes simply, so reduced the cost of the Sewing machines 1 with upper thread tension adjustment device 5.
Owing to acting on the spring load F that tension force is set the clamp spring 15 on the nut 16 1Spring load F with stable operation spring 18 2Direction be opposite direction, the F that therefore makes a concerted effort becomes F=(F 1-F 2).For make tension force set the revolving force of nut 16 rotations (below, be called tension force and set the necessary revolving force of nut 16), since exist situation about moving to the opposite direction of the F that makes a concerted effort with to situation about moving with the identical direction of F of making a concerted effort, in both cases, be worth slightly different.Below, the subtend situation that the opposite direction of F moves of making a concerted effort describes.
When 19 rotation of clamp dial, the frictional force between frictional force, clamp dial 19 and the axle 11 between the plain washer 20 of necessary revolving force, clamp dial 19 and the end 11c side of tension force setting nut 16 acts on the clamp dial 19.
Tension force is set the necessary revolving force of nut 16, has resistant function to set the spring load F of the clamp spring 15 on the nut 16 at tension force 1Spring load F with stable operation spring 18 2The F that makes a concerted effort (to the opposite direction of the F that makes a concerted effort) the frictional force F that makes power that screw thread rises, between internal thread part 16d and external thread part 11a, produce because of F with joint efforts μ 1, will set each deadweight of nut 16 and tension force expressed portion 17 and the frictional force F of the frictional force addition that produces by tension force 01At this, frictional force F 01Be certain value.Because the spring constant K of clamp spring 15 and stable operation spring 18 sets equally, so each spring 15,18 deflection are made as respectively X 1, X 2The time, F 1=KX 1, F 2=KX 2Frictional force F μ 1F produces because making a concerted effort.Therefore, the tension force necessary revolving force of setting nut 16 becomes the driving force of the change that produces because of the F that makes a concerted effort and the frictional force F of the certain value that produced by the deadweight of tension force setting nut 16 and tension force expressed portion 17 01
When upper line tension setting value was maximum, the spring load that acts on the tension force setting nut 16 of clamp spring 15 and stable operation spring 18 was set to respectively Fmax and 0.Upper line tension setting value hour, the tension force that acts on of clamp spring 15 and stable operation spring 18 is set spring load on the nut 16 and is set to respectively 0 and Fmax.
Frictional force between clamp dial 19 and the plain washer 20 is by the spring load F that acts on the stable operation spring 18 on the clamp dial 19 2And produce, but plain washer 20 diameters are little, and the diameter of comparing clamp dial 19 uses the low sliding material of coefficient of friction, so set the frictional force of screw thread of nut 16 than tension force minimum, can ignore.The rotation torque of the clamp dial 19 that therefore, is produced by the frictional force between clamp dial 19 and the plain washer 20 can be ignored.
Frictional force F between clamp dial 19 and the axle 11 02Deadweight by clamp dial 19 produces, so be certain value.As mentioned above, when 4 tension force is reached the standard grade in adjustment, in order to make 19 rotations of clamp dial, must possess by frictional force F 01With frictional force F 02Total frictional force (after, be called the frictional force F of the certain value that is produced by deadweight 0) and the rotation torque that brings of the driving force of the change that produces by making a concerted effort F.
Figure 10 is the clamp spring 15 of expression the present embodiment and the spring load F of stable operation spring 18 1, F 2, the frictional force F of the F that makes a concerted effort, the certain value that produced by deadweight 0The figure of the comparison (Figure 10 (c)) of the rotation torque T of the rotation torque T of (Figure 10 (a)) and clamp dial 19 (Figure 10 (b)) and the present embodiment and prior art and Q.Figure 11 is the clamp spring 114 of expression prior art, the spring load P of holddown spring 116 1, P 2And the figure of the rotation torque Q (Figure 11 (b)) of make a concerted effort P (Figure 11 (a)) and operation dial 117.Among Figure 10, Figure 11, the longitudinal axis represents spring load (solid line), each absolute value of make a concerted effort (heavy line), frictional force (dotted line) and rotation torque (heavy line), transverse axis represents each dial 19,117 the anglec of rotation, line tension setting value on this anglec of rotation correspondence.
The adjusting range of the anglec of rotation of clamp dial 19 for example is made as 0～1080 ° (three circles), and the adjusting range of the anglec of rotation of the operation dial 117 of prior art is made as 0～360 ° (circle).The anglec of rotation under the maximum rating of the upper line tension setting value of 0 ° of the transverse axis of Figure 10, Figure 11 expression the present embodiment and prior art, the anglec of rotation under the minimum state of the upper line tension setting value of 360 ° of expression prior aries, the anglec of rotation under the minimum state of the upper line tension setting value of 1080 ° of expression the present embodiment.Shown in Figure 10 (a), act on tension force and set clamp spring 15 on the nut 16 and the spring load F of stable operation spring 18 1And F 2Locate to become equal 540 ° of the anglecs of rotation of clamp dial 19.Act on tension force and set clamp spring 15 on the nut 16 and the spring load F of stable operation spring 18 1And F 2The F=(F that makes a concerted effort 1-F 2) absolute value locate to become minimum of a value 0 540 ° of the anglecs of rotation of clamp dial 19, locate all to become Fmax 0 ° of the anglec of rotation and 1080 °, shape is in the shape of the letter V.Shown in Figure 10 (b), the required rotation torque T (heavy line) of rotation clamp dial 19 also locates to become Tmin 540 ° of the anglecs of rotation of clamp dial 19, locates all to become Tmax 0 ° of the anglec of rotation and 1080 °, and shape is in the shape of the letter V.The rotation torque Tmin of clamp dial 19 is the frictional force F by the certain value of deadweight generation 0And the moment of torsion that produces.The rotation torque T of clamp dial 19 will be for setting clamp spring 15 on the nut 16 and the spring load F of stable operation spring 18 by acting on tension force 1And F 2The rotation torque that produces of the F that makes a concerted effort and the value of rotation torque Tmin addition.And the rotation torque T of the cylindrical portion 19a of clamp dial 19 multiplies each other the radius that acts on the cylindrical portion 19a of revolving force on the clamp dial 19 and clamp dial 19 and calculates.The necessary revolving force that tension force is set nut 16 is to set each deadweight of nut 16 and tension force expressed portion 17, the lead angle of internal thread part 16d and the coefficient of friction of effective diameter and screw according to the F that makes a concerted effort, tension force to calculate.
On the other hand, in order to make operation dial 117 rotations of the prior art, must possess certain frictional force P of the frictional force addition that each deadweight by spring bearer plate 115 and operation dial 117 is produced 0, based on the spring load P by clamp spring 114 and holddown spring 116 1, P 2The P=(P that makes a concerted effort 1-P 2) rotation torque, the rotation torque that is produced by the frictional force of operation dial 117 and outer cover 102 of driving force of the change that produces.
In order to reduce the frictional force of 102 of operation dial 117 and outer covers, the spring constant of holddown spring 116 and spring load P 2Set than spring constant and the spring load P of clamp spring 114 1Minimum.The frictional force that operation dial 117 and outer cover are 102 is produced between the end face 102b of the end face 117b that operates dial 117 and outer cover 102 peristome 102a by the spring load of holddown spring 116.According to above-mentioned reason, by operation dial 117 and outer cover 102 are used the low materials of coefficient of friction such as sliding material, significantly reduce the frictional force of 102 of operation dial 117 and outer covers.
At this, for relatively upper thread tension adjustment device 5 and the tension disk of the prior art 110 (upper thread tension adjustment device) of the present embodiment, coefficient of friction, lead angle and the effective diameter of the tension force of the present embodiment being set the screw section of the external thread part 16d of nut 16 and spring bearer plate of the prior art 115 are made as respectively equal.And, clamp spring 15, stable operation spring 18 and the clamp spring 114 of the prior art of the present embodiment, the installed load separately (the minimum spring load of each spring) of holddown spring 116 are made as 0, and the present embodiment and the maximum Fmax that makes a concerted effort of the prior art and Pmax are made as to equate to be Fmax=Pmax, and with the present embodiment and the frictional force F that is produced by deadweight of the prior art 0And P 0Be made as and equate to be F 0=P 0
Shown in Figure 11 (a), under these conditions, tension disk 110 of the prior art under the maximum rating (0 ° of the anglec of rotation), acts on clamp spring 114 on the spring bearer plate 115 and the spring load P of holddown spring 116 in upper line tension setting value 1, P 2Be respectively Pmax (=F Max) and 0.Upper line tension setting value (360 ° of the anglecs of rotation) is when being minimum state, and the spring load that acts on clamp spring 114 on the spring bearer plate 115 and holddown spring 116 is respectively 0, Ps.Spring load P 1With spring load P 2Make a concerted effort P 0 ° of the anglec of rotation locate to become maximum Pmax (=Fmax), locating to become minimum of a value 0 near anglec of rotation α ° of 360 ° of the anglecs of rotation, 360 ° of the anglecs of rotation locate to become Ps (＜Fmax), Ps is less than Pmax.Therefore, make a concerted effort P in the tension force setting range relative rotation angle α ° be asymmetrical V-shape, become uneven.Certain frictional force P by the deadweight generation 0(=F 0) constant 0 °～360 ° of the anglecs of rotation.
As mentioned above, shown in Figure 11 (b), the rotation torque Q that is used for rotary manipulation dial 117 locates to become maximum Qmax=Tmax 0 ° of the anglec of rotation, locates to become Qmin=Tmin at anglec of rotation α °, locates to become Qs 360 ° of the anglecs of rotation.Rotation torque Qs becomes the value less than rotation torque Qmax, and in the tension force setting range of 0 °～360 ° of the anglecs of rotation, relative rotation angle α ° is asymmetrical V-shape, becomes uneven.
Shown in Figure 10 (c), in the tension disk 110 in the prior art, the poor Δ T of the rotation torque of the operation dial 117 of upper line tension maximum rating and upper line tension minimum state is larger, and relative rotation torque becomes the anglec of rotation α ° of minimum imbalance that becomes in the tension force setting range, therefore the user produces sense of discomfort when the tension force that adjustment is reached the standard grade.But, in the upper thread tension adjustment device 5 of the present embodiment, the poor Δ T=0 of above-mentioned rotation torque, and rotation torque becomes 540 ° of the minimum anglecs of rotation relatively in the tension force setting range, keep balance, therefore on adjusting during line tension, the user can cosily adjust the tension force of reaching the standard grade.
And tension force is set nut 16 when moving with the identical direction of F of making a concerted effort, and make a concerted effort F and rotation torque T are same as described above, and in the tension force setting range of 0 °～1080 ° of the anglecs of rotation, 540 ° of relative rotation angle are symmetrical V-shapes, keep balance.But in this case, the frictional force between screw thread be owing to relatively can act on opposite direction to the reverse situation about moving of the F that makes a concerted effort, so compare with the situation to the reverse movement of the F that makes a concerted effort, how many values of F and rotation torque T reduces with joint efforts.
Figure 12 is the cutaway view of the related upper thread tension adjustment device of modified embodiment of the present invention, and Figure 13 is the key diagram that the tension force of Figure 12 is set the joint portion of nut and tension force expressed portion.Among Figure 12, line tension maximum rating in Figure 12 (a) expression, line tension minimum state in Figure 12 (b) expression.And, the D-D line section of Figure 13 (b) expression Figure 13 (a), the root of the fine rule among the figure * mark indication notch recess 41e (setting the side joint portion).In Figure 12, Figure 13, the title identical with Fig. 3 and Fig. 4, identical shaped parts are put on the label identical with Fig. 3 and Fig. 4.
In the upper thread tension adjustment device 5 of Fig. 3, because the spring load of clamp spring 15 and stable operation spring 18, the tension force expressed portion 17 that tension force setting nut 16 and tension force setting nut 16 possess is pressed respectively.But, the upper thread tension adjustment device 40 of Figure 12, because the spring load of clamp spring 15 and stable operation spring 18, tension force expressed portion 42, tension force that tension force setting nut 41 possesses are set nut 41 and are pressed respectively.
As shown in figure 12, tension force setting nut 41 can and screw togather with it in the external thread part 11a of axle 11 rotation with moving axially.Tension force is set the tension force expressed portion 42 that nut 41 (tension force setting operating member) connects in outer peripheral face has the inner peripheral surface that supplies cylindrical portion 42a, and as shown in figure 13, set a plurality of breach recess 41e fastenings of nut 41 from the breach protuberance 42c (expression side joint portion) of the inner peripheral surface projection of the cylindrical portion 42a of tension force expressed portion 42 at tension force, form joint portion 43.
Set at tension force between the tension force expressed portion 42 and thread tension disc 13 of nut 41, be provided with clamp spring 15 via spring support 14, by the spring load of clamp spring 15, press the face 42ba of tension force expressed portion 42, and press thread tension disc 13 via spring support 14.Between tension force setting nut 41 and clamp dial 19, be provided with stable operation spring 18, by the spring load of stable operation spring 18, press compression and tension and set the end face 41ca (face) of nut 41 and the face 19b of clamp dial 19.
Breach protuberance 42c departs from 180 ° at same circumference and is provided with vertically a pair ofly, and is located at the inner peripheral surface of cylindrical portion 42a.Breach recess 41e is provided with a plurality of along same circumference in the left side of Figure 12 of tension force setting nut 41, a plurality of breach recess 41e are different respectively apart from the distance of end face 41ca, form the set of one group of breach recess 41e.The set of one group of breach recess 41e (being in the interior breach recess 41e of 180 ° of scopes of central angle of Figure 13 (b)) departs from 180 ° of angles along same circumference and arranges.When factory assembles, under the predetermined installed load of clamp spring 15, be pressed into the fine setting pawl 42j that is located on the tension force expressed portion 42, make a pair of breach protuberance 42c, the 42c of tension force expressed portion 42 and a pair of breach recess 41e, the 41e engagement that tension force is set nut 41, so that the expression groove 42d corresponding with this load (drawer at movable side tensiometer indicating note) shifts to indication groove 3a.
The rotation of clamp dial 19 is converted to tension force to be set the mobile switching mechanism 44 that screws togather of nut 41 and forms by being located at the slide rail 19d on the clamp dial 19 and being located at the sliding-rail groove (not shown) that tension force sets on the nut 41.Other structures of upper thread tension adjustment device 40 are identical with the upper thread tension adjustment device 5 of Fig. 3.By the spring load of clamp spring 15, press successively face 42ba, the breach protuberance 42c of tension force expressed portion 42 and set nut 41 via the tension force of breach 41e.On the other hand, directly press compression and tension by the spring load of stable operation spring 18 and set nut 41.Other effects are identical with the upper thread tension adjustment device 5 of Fig. 3.Therefore, the Sewing machines 9 that has a upper thread tension adjustment device 40 produces the effect identical with the Sewing machines 1 with upper thread tension adjustment device 5.

Claims (8)

1. the Sewing machines with upper thread tension adjustment device is characterized in that, this upper thread tension adjustment device comprises:
Be provided with the axle of external thread part;
Drawer at movable side tensiometer indicating note, it is located at and screws togather with described external thread part and can screw togather on the mobile tension force setting operating member;
The clamp dial, it is installed in the distolateral of described axle revolvably, has rotation is converted to the mobile switching mechanism that screws togather that described tension force is set operating member;
The fixation side thread tension disc, it is distolateral that it is located at another of described axle;
The drawer at movable side thread tension disc, it is inserted on the described axle, reaches the standard grade with the clamping of described fixation side thread tension disc;
The clamp spring, it is located at described drawer at movable side thread tension disc and described tension force is set between the operating member, and described drawer at movable side thread tension disc and described tension force setting operating member are applied respectively rightabout elastic force;
The stable operation spring, it is located at described clamp dial and described tension force is set between the operating member, and described clamp dial and described tension force setting operating member are applied respectively rightabout elastic force; And
Fixation side tensiometer indicating note, it is located on the fixed part of described Sewing machines, by the rotation of described clamp dial, makes described tension force set operating member and screws togather movement, thereby determine the position of described drawer at movable side tensiometer indicating note.
2. the Sewing machines with upper thread tension adjustment device as claimed in claim 1 is characterized in that,
Described tension force is set operating member and is comprised the tension force expressed portion that is provided with described drawer at movable side tensiometer indicating note,
Be located at setting side joint portion and the expression side joint portion snapping that is located on the described tension force expressed portion on the described tension force setting operating member, and press described tension force expressed portion by the elastic force of described stable operation spring, and press described tension force via described expression side joint portion and described setting side joint portion and set operating member
The either party is provided with a plurality ofly on same circumference vertically in described setting side joint portion and the described expression side joint portion, and the opposing party is provided with on described circumference vertically than described a plurality of numbers of lacking,
In the combination in described a plurality of combinations of described setting side joint portion and described expression side joint portion snapping more than at least two groups, the distance that the described tension force that the elastic force by described clamp spring is pressed is set between the face of the described tension force expressed portion that the face of operating member and the elastic force by described stable operation spring is pressed is different.
3. the Sewing machines with upper thread tension adjustment device as claimed in claim 1 is characterized in that,
Described tension force is set operating member and is comprised the tension force expressed portion that is provided with described drawer at movable side tensiometer indicating note,
Be located at setting side joint portion and the expression side joint portion snapping that is located on the described tension force expressed portion on the described tension force setting operating member, and press described tension force expressed portion by the elastic force of described clamp spring, and press described tension force via described expression side joint portion and described setting side joint portion and set operating member
The either party is provided with a plurality ofly on same circumference vertically in described setting side joint portion and the described expression side joint portion, and the opposing party is provided with on described circumference vertically than described a plurality of numbers of lacking,
In the combination in described a plurality of combinations of described setting side joint portion and described expression side joint portion snapping more than at least two groups, the distance that the described tension force that the face of the described tension force expressed portion that the elastic force by described clamp spring is pressed and the elastic force by described stable operation spring are pressed is set between the face of operating member is different.
4. such as each described Sewing machines with upper thread tension adjustment device in the claims 1 to 3, it is characterized in that,
The elastic force of the described stable operation spring the when elastic force of the described clamp spring when described tension force of reaching the standard grade is maximum rating and described tension force of reaching the standard grade are minimum state is equal,
The elastic force of the described clamp spring the when elastic force of the described stable operation spring when described tension force of reaching the standard grade is maximum rating and described tension force of reaching the standard grade are minimum state equates, and the spring constant of the spring constant of described clamp spring and described stable operation spring equates.
5. the Sewing machines with upper thread tension adjustment device as claimed in claim 1 is characterized in that,
Described tension force is set the Actuator Division and is had cylindrical portion, disposes two groups at the outer peripheral face of this cylindrical portion and sets the side joint portions.
6. the Sewing machines with upper thread tension adjustment device as claimed in claim 5 is characterized in that,
Described setting side joint portion is departed from 180 ° of ground configurations mutually on the circumference of described cylindrical portion.
7. the Sewing machines with upper thread tension adjustment device as claimed in claim 6 is characterized in that,
On the tension force expressed portion, on the circumference of described cylindrical portion, mutually depart from 180 ° position be provided with vertically outstanding and with the expression side joint portion of described setting side joint portion snapping.
8. the Sewing machines with upper thread tension adjustment device as claimed in claim 1 is characterized in that,
Described clamp dial is provided with slide rail, and be formed with the slotted hole of circular shape in the tension force expressed portion, described slide rail inserts this slotted hole, when rotating described clamp dial, described tension force is set the Actuator Division along described slide rail slip and is rotated, and moves vertically relative to described clamp dial pro rata with the anglec of rotation of described clamp dial.
CN 201010266744 2009-08-31 2010-08-27 Sewing device with an upper thread tension adjustment device Expired - Fee Related CN102002824B (en)

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JP2009200209A JP5458748B2 (en) 2009-08-31 2009-08-31 Sewing machine with needle thread tension adjustment device
JP2009-200209 2009-08-31

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JP5708011B2 (en) 2011-02-21 2015-04-30 アイシン精機株式会社 sewing machine
KR20130077214A (en) * 2011-12-29 2013-07-09 주식회사 썬스타 Thread tension adjusting device
WO2020183714A1 (en) * 2019-03-14 2020-09-17 エヌエスディ株式会社 Sewing machine
CN112112260B (en) * 2020-09-22 2022-02-08 四川中物裕邦科技有限公司 Security check door connection structure

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