JPS6040877B2 - Sewing machine upper shaft mounting device - Google Patents

Description

[Detailed description of the invention] Technical field This invention relates to an upper shaft mounting device for a sewing machine.

Prior Art Conventionally, as this type of device, for example,
As described in Publication No. 8-4063, a pair of spherical metals are placed near both ends of the upper shaft of the sewing machine so that they cannot move toward the enemy, and a pair of metal balls that protrude forward are placed on the back plate of the sewing machine frame. There is a sewing machine in which the upper shaft is rotatably supported on the sewing machine frame by providing a seat and attaching each spherical metal to the seat using a mounting plate and screws.

However, in this conventional configuration, in order to support the spherical metal on the spherical surface, not only high processing accuracy and high bonding accuracy are required for each component, especially the spherical metal and the seat, but also the bonding work is difficult. However, there was a problem in that it was extremely complicated and it was difficult to adjust the pongee attachment position. Purpose This invention was made in order to eliminate the above-mentioned defects, and its purpose is to easily perform the work of attaching and positioning the upper shaft to the sewing machine frame, which requires high processing accuracy. The purpose of the present invention is to provide an inexpensive top-mounting device for a sewing machine.

Embodiment Hereinafter, an embodiment embodying the present invention will be described with reference to FIGS. 3
The shaft cylinder 4 is fixed to the shaft.

Adjacent to this wisteria pipe 4, on the upper shaft 2, an intermediate pulley 5 for transmitting driving force to a feed mechanism (not shown) is attached to a pin 5a.
A driven pulley 6 is mounted on the upper shaft 2 between the shaft cylinder 4 and the intermediate pulley 5 with a loose iron at its cylindrical portion 6a. There is. A clutch spring 7 is wound between the brochure tube 4 and the bag tube portion 6a of the driven pulley 6, and the driven pulley 6 and the upper bucket 2 are normally connected by the action of the clutch spring 7. When the driven pulley 6 is rotated by the sewing machine motor via a drive pulley and a belt (both not shown), the upper shaft 2 is rotated via the driven pulley 6, the clutch spring 7, etc. Further, the shaft tube 4, the intermediate pulley 5, the driven pulley 6, the clutch spring 7, etc. constitute a power transmission means. Adjacent to the intermediate pulley 5, a first spherical metal 8 as a bearing metal and a noise-deadening sheet 9 are inserted in the center of the upper shaft 2, and the shaft cylinder 4, the intermediate pulley 5, and the driven pulley 6
The first spherical metal 8 is positioned with respect to the upper shaft 2 through the retaining ring 10', with the first spherical metal 8 and the sound-deadening sheet 9 in close contact with each other.

Near the left end of the upper shaft 2, a second spherical metal 11 is inserted at its center so as to be slidable in the direction of the rattan line of the upper shaft 2, and this second spherical metal 11 and the first spherical metal A metal cylindrical member 12 is inserted between the upper shaft 2 and the upper shaft 2 through a pair of bushes 13 so as to be relatively rotatable. A cam body 14 having a large number of patterned cams 14a on the outer periphery is fixedly inserted onto this cylindrical member 12, and the cylindrical part village 12 and A cam body 14 is positioned relative to the upper shaft 2. When the upper shaft 2 rotates, the cam body 14 is rotated via a gear 5b integrally formed with the intermediate pulley 5, an intermediate gear (not shown), and a gear 14b formed at the right end of the cam body 14. ing. Each of the spherical metals 8 and 11 is supported by a pair of seats 16 and 17 that are integrally formed to protrude within the arm portion la. Each catch 16,1
The metal receiving surface 7 is formed by four inclined surfaces 16a to 16d and 17a to 17d in the shape of a V-shape and in the shape of an inverted quadrangular pyramid in the axial direction of the upper shaft 2 and in a direction perpendicular thereto. Further, recesses 16e and 17e extending in a direction perpendicular to the axial direction of the upper shaft 2 are formed in the center of the receiving surfaces of the respective seats 16 and 17, respectively. When roughly fitting the upper shaft 2 into the arm part la, after adjusting the position by appropriately sliding the second spherical metal 11 in the axial direction of the upper ball 2, both spherical metals 8, 11 By placing the spherical metals 8 and 11 on both the seats 16 and 17, the spherical metals 8 and 11 are engaged with the spherical surfaces 16a to 16d and 17a to 17d of the respective seats 16 and 17, and the second At the same time, the spherical metal 11 is positioned with respect to the upper shaft 2, and at the same time, the upper shaft 2 is easily positioned with respect to the arm portion la in its axial direction and in a direction perpendicular thereto. A support frame 18 for supporting the pattern selection mechanism is constructed between first and second support plates 19 and 20 as a pair of pressing plates located at both ends of the frame 18, and both support plates 19 and 20. A plurality of support shafts 21 and 22 are supported by the one support shaft 21 at both end bent portions 23a, and both side locking protrusions 23
M trowel Each support plate 19, 20' is locked to the construction plate 2
It consists of 3.

Through holes 24 and 25 are formed at positions facing each other in the lower center of each support plate 19 and 20, respectively.
Then, with the first and second spherical metals 8 and 11 inserted into the respective through holes 24 and 25, the lower end protrusions of each of the support plates 19 and 20 are inserted into the recesses of the seats 16 and 17. 1
6c, 17c, and each support plate 19, 20 is formed on the circumferential surface of each spherical metal 8, 1.
The upper part of the bag can be moved integrally in the direction of the bag line of the upper shaft 2. Each support plate 19, 20' is integrally formed with a pair of mounting pieces 26 (only one of the support plates 20 is shown) that protrudes laterally.
The support frame 18 is attached to a boss 28 in the arm portion la using screws 27 (not shown) so that its position can be adjusted. On the one support shaft 21, a first swing link 2 is disposed inwardly of each bent portion 23a of the construction plate 23.
9 is swingably supported, and an extending piece 29a is provided on the rear side edge.
is formed.

A linking screw 30a is attached to a Hasui 30 disposed in the arm portion la adjacent to the first swing link 29, and based on the engagement between the linking screw 30a and the extension piece 29a,
The first swing link 29 is operatively connected to a needle bar (not shown) via a shaft 30. Furthermore, a plurality of engaging portions 29b, 29c, and 29d, each of which has a different width in the left and right directions, are protruded from the front edge of the first swing link 29 at predetermined intervals. A second swing link 31 is located inside the first swing link 29 on the one support ball 21.
is swingably supported, and its second swing link 31 is operatively connected to a feed adjustment mechanism (not shown) at the right bent portion 31a. The front green part of the second swing link 31 is provided with each engaging portion 29b, 29 of the first swing link 29.
A plurality of extending pieces 31b, 31c, 31d are formed between the two extending pieces 31b, 31c, and 31d that extend forward between the two extending pieces 31b, 31c, and 29d, and an adjusting plate 33 is attached to the top of the two extending pieces 31b, 31c by means of mounting screws 32. It is worn. Further, as shown in FIG. 3, each adjustment plate 33 is provided with an adjustment screw 34 for adjusting the mounting position of each adjustment plate 33 in cooperation with the mounting screw 32. A large number of operating levers 35 are arranged in a row at predetermined intervals on one support shaft 21 inside the second swing link 31 so as to correspond to each pattern cam 14a of the cam body 14. They are individually rotatably supported at their base ends on a support shaft 21 (not shown in FIG. 1).

Approximately at the center of each operating lever 35, one end is connected to the engaging portions 29b to 29d on each swing link 29, 31, the extending piece 31d and the adjustment plate 33, and the other end is connected to each pattern cam 14a. A contact 36 that can be engaged and disengaged is rotatably supported. An operation key 38 that projects upwardly from the arm portion la through the through hole 37 of the construction plate 23 is fixed to the upper tip of each operation lever 35.
A locking piece 39 is formed protruding from the tip of 5. Also,
A spring hanging piece 42 and a regulating piece 43 that project upward through the slits 40 and 41 of the construction plate 23 are formed on the upper green side of each operating lever 35 . A comb-shaped leaf spring 44 is attached to the upper surface of the construction plate 23 at its base end by a plurality of screws 45 (only one is shown) so as to correspond to each operating lever 35. Each spring piece 44a
Based on the engagement with the spring hook 42 of each operating lever 35, each operating lever 35 is biased to rotate in the direction of the recoil gauge shown in FIG.

The locking corner portion 35a of each operating lever 35 is always engaged with the green portion of the base end of the leaf spring 44 through the through hole 37 based on the biasing force of each spring piece 44a, and each operating lever 35 is held in the inactive position shown in FIGS. In this state, as shown by solid lines in FIG.
It is placed at a position away from 1. Further, the leaf spring 4
4 is formed with a row of elongated holes 44b that allow the restriction pieces 43 of each operating lever 35 to enter. Each of the operating levers 3
5, the other support shaft 22 has a third locking plate 46 extending in the direction of the ball at both ends 46a thereof.
It is rotatably supported between two positions shown by solid lines and chain lines in the figure, and is urged to rotate toward the solid line position by a spring (not shown).

This locking plate 46 is formed with a row of holes 47 in which the locking pieces 39 of each operating lever 35 can engage, and the bent portion 4
8 is formed. When the operation key 38 is selectively pressed down against the spring force of the spring piece 44a, the operation lever 35 is rotated clockwise in FIG. Cam surface 39a of stopper piece 39
Based on the engagement of the bent portion 48 with the bent portion 48, the locking plate 46 is rotated to the wire position shown in FIG. 3 against the force of a spring (not shown). Thereafter, the locking piece 39 enters into the elongated hole 47 of the locking plate 46, and the locking plate 46 is rotated back to the solid line position in the same figure.
is engaged with the upper surface of the construction plate 23, and rotation of the operating lever 35 is prevented. When the operation key 38 is released from the depression operation, the locking piece 39 is locked to the upper end of the elongated hole 47 based on the spring force of the spring piece 44a, and the operation lever 35 is held at the operating position. . As a result, the lower end of the cam contactor 36 is engaged with the corresponding pattern cam 14a, as shown by the iron wire in FIG. 29b-29d,
It is engaged with either one of the extending piece 31d and the adjusting plate 33. When the Kamito 2 is rotated in this state,
According to the cam shape of the pattern cam 14a, the first or second swing links 29, 31 are swung via the cam acid probe 36, and the needle comb or feed adjuster is operated. A pattern selection mechanism is constituted by the operation lever 35, the cam contactor 36, the leaf spring 44, the locking plate 46, etc., and this pattern selection mechanism is arranged as a unit on the support frame 8 so that silk can be applied. It has become.

When sewing a line with the sewing machine configured as described above, the first
As shown in the figure, the first spherical metal 8 is placed on the upper shaft 2.
``The noise-absorbing sheet 9, the intermediate pulley 5, the sliding pulley 6, and the ball tube 4 are supported in a state in which they are in close contact with each other and cannot be moved in the ball line direction by the pin 3 and the stopper 10.

Next, after winding the clutch spring 7 around the shaft tube 4 and the shaft tube portion 6a of the driven pulley 6, the first support plate 19 is inserted into the first spherical metal 8 through its through hole 24. , the cylindrical member 12, the bush 13, and the cam body 14 are passed through the upper shaft 2, and each of these members 12 to 14 is secured by a retaining ring 15.
axial movement is prevented. Then, the second spherical metal 11 is movably inserted into the upper shaft 2, and the second spherical metal 111 is inserted into the second support plate 20. next,
The support shafts 21, 22 are assembled to the support plates 19, 20', and the first and second swing links 29, 31' are attached to the support shafts 21, 22. When the operating lever 35, locking plate turtle 6, construction plate 23, etc. are supplied, rough attachment of the pattern cam/pattern selection mechanism unit to the upper shaft 2 is completed.This unit is attached to the arm section la.
When attaching silk to the inside, move the first and second support plates 19, 20 and the second spherical metal 11 in the direction of the rut line of the upper shaft 2 to adjust their positions, and then move both support plates The lower end protrusions of 19 and 20 are moved into the recesses 16e and 17e of the seats 16 and 17, respectively, and the spherical metals 8 and 11 are inserted into the inclined surfaces 16a to 16d and 17a of each of the seats 16 and 17. 17
By engaging with d, it is possible to easily position the second spherical metal 11 with respect to the rattan line direction of the upper shaft 2 and position the upper shaft 2 with respect to the arm portion la.

At this time, if each contactor 36 is not in a predetermined positional relationship with each pattern cam 14a, both support plates 19, 20 are moved to the spherical metal 8, within the range regulated by the recesses 16e, 17e. By sliding the annular surfaces 8a, 11a of 11 in the mariline direction of the upper wisteria 2, each contact 36 can be easily and reliably positioned with respect to each pattern cam 14a. After completing this positioning work, attach the mounting piece 2 with the screw 27.
If each support plate 19, 20 is tightened and fixed to the boss 28 through the mounting hole 6, each spherical metal 8, 11 is pressed and fixed to each catch seat 16, 17 from each support plate 19, 20', and this unit The paper attachment is completed. In the sewing machine assembled as described above, the load of the pattern selection mechanism is transferred to the first and second support plates 19, 20, the first and second spherical metals 8, 1.
1 to the first and second seats i6, 17, the upper shaft 2 can be rotated smoothly.

Note that this invention is not limited to the above-mentioned embodiments; for example, each part may be modified without departing from the spirit of the invention, such as forming the receiving surface of each catch with three inclined surfaces in the shape of an inverted triangular pyramid. It is also possible to change the configuration arbitrarily. Effects As detailed above, in this invention, the first spherical metal is fixed on the upper shaft of the sewing machine, the second spherical metal is slidably arranged, and the metal receiving surfaces of the pair of seats are fixed to the upper shaft of the sewing machine. By forming three slanted surfaces and engaging each spherical metal with the metal receiving surface, the upper koshi was positioned on the sewing machine frame, and the pressing plate pressed each spherical metal and fixed it to the metal receiving surface. It is possible to easily perform the work of attaching the upper heat to the sewing machine frame and the work of adjusting its position, and it has excellent effects such as not requiring high processing accuracy and being able to be manufactured at low cost.

[Brief explanation of the drawing]

Fig. 1 is a front sectional view showing the main parts of a sewing machine embodying this invention, Fig. 2 is a sectional side view of the main part, Fig. 3 is an enlarged sectional view of the main part, and Fig. 4 is a partially scaled perspective view. . 1...Sewing machine frame, 2...Upper kettle, 4...Shaft cylinder, 5
... Intermediate pulley, 6... Driven pulley, 7... Clutch spring (power transmission means is constituted by the above-mentioned 4 to T, etc.), 8... First spherical metal, 11... Second spherical metal, 16...first catch, 17...second catch, 16a to 16d, 17a to 17d...superior slope, 19,20...first and press plate as Second support plate. Figure 1 Figure 3 Figure 2 Figure 4

Claims (1)

[Claims] 1. A first spherical metal 8 at a predetermined position on the upper shaft 2 of the sewing machine.
, and a second spherical metal 11 is slidably disposed on the upper shaft 2, and two spherical metals are attached to the sewing machine frame 1 in order to support the upper shaft 2 via both the spherical metals 8 and 11. The seats 16, 17 are formed, and the spherical metals 8, 1
The metal receiving surfaces of the respective seats 16, 17 that receive the metal parts 16 and 17 are formed of at least three inclined surfaces 16a to 16d, 17a to 17d, and each of the spherical metal parts 8, 11 is formed on the metal receiving surface.
By engaging the upper shaft 2, the upper shaft 2 is positioned on the sewing machine frame 1 in its axial direction and in a direction perpendicular thereto, and the respective spherical metals 8, An upper shaft mounting device for a sewing machine, characterized in that the upper shaft mounting device for a sewing machine is fixed to the metal receiving surface by pressing the upper shaft. 2. The first spherical metal 8 is positioned on the upper shaft 2 integrally with a power transmission means (4 to 7, etc.) disposed at one end of the upper shaft 2. Upper shaft mounting device of the sewing machine described. 3. The metal receiving surfaces of each of the seats 16 and 17 have four inclined surfaces 16a to 16a each forming a V-shape in the axial direction of the upper shaft 2 and in a direction perpendicular thereto.
16d, 17a to 17d. The upper shaft mounting device for a sewing machine according to claim 1.