JPS627871B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION TECHNICAL FIELD The present invention relates to a sewing machine equipped with a pattern cam that is rotatable together with an upper shaft and a pattern selection mechanism that includes a contact that can be engaged with and separated from the pattern cam.

Prior Art Conventionally, in this type of sewing machine, an upper shaft having an integrally rotatable pattern cam and a support frame for supporting a pattern selection mechanism including a contactor are arranged in a predetermined positional relationship. Generally, they are individually arranged and fixed to seats on the frame. However, in this conventional configuration, in order to accurately determine the positional relationship of the contact with respect to the pattern cam on the upper shaft, it is necessary to improve the dimensional accuracy of the catch, the processing accuracy of each part, and the assembly accuracy. Not only that, but extremely detailed positioning work had to be carried out.

In addition, in order to make effective use of the space within the sewing machine frame, in a type of sewing machine in which the support frame is inserted and supported on the upper shaft, the load of the support frame and pattern selection mechanism, and the support frame on the sewing machine frame are The pressing force for tightening and fixing to the catch is transmitted to the upper shaft via the bearing metal,
There was a risk that the rotation of the upper shaft would be hindered.

Purpose This invention was made to eliminate the above-mentioned defects, and its purpose is to easily position the contact with respect to the pattern cam in a short time without disturbing the smooth rotation of the upper shaft. The purpose of the present invention is to provide a sewing machine that can perform the following tasks and is also inexpensive.

Embodiment A first embodiment embodying the present invention will be described below with reference to FIGS. A shaft cylinder 4 is fixed to the right end with a pin 3. An intermediate pulley 5 is mounted on the upper shaft 2 adjacent to the shaft cylinder 4 to be movable in the axial direction of the upper shaft 2 by means of a pin 5a for transmitting driving force to a feed mechanism (not shown). , a driven pulley 6 is disposed on the upper shaft 2 between the shaft cylinder 4 and the intermediate pulley 5.
is loosely fitted in the shaft cylindrical portion 6a. A clutch spring 7 is wound between the shaft cylinder 4 and the shaft cylinder portion 6a of the driven pulley 6, and the action of the clutch spring 7 normally causes the driven pulley 6 and the upper shaft 2 to
are connected. A pulley and belt (none of which are shown) are driven by the sewing machine motor.
When the driven pulley 6 is rotated via
The driven pulley 6 and the clutch spring 7
The upper shaft 2 is rotated via, etc. Further, the shaft cylinder 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-reducing sheet 9 are inserted into the upper shaft 2 at its center, and the shaft cylinder 4, the intermediate pulley 5, the driven pulley 6, The first spherical metal 8 is positioned with respect to the upper shaft 2 by a retaining ring 10 with the first spherical metal 8 and the sound-deadening sheet 9 in close contact with each other. A second spherical metal 11 is fitted in the vicinity of the left end of the upper shaft 2 at its center so as to be slidable in the axial direction of the upper shaft 2, and this second spherical metal 11 and the first spherical metal 8 A metal cylindrical member 12 is fitted onto the upper shaft 2 via a pair of bushes 13 so as to be relatively rotatable therebetween. A cam body 14 having a large number of patterned cams 14a on the outer periphery is inserted and fixed onto this cylindrical member 12,
The cylindrical member 12 and the cam body 14 are secured by the retaining ring 10 and the retaining ring 15 on the second spherical metal 11 side.
is positioned relative to the upper shaft 2. and,
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. .

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 1a. The metal receiving surfaces of each of the seats 16 and 17 are four inclined surfaces 1 in the shape of an inverted quadrangular pyramid forming a V-shape in the axial direction of the upper shaft 2 and in a direction perpendicular thereto.
6a to 16d and 17a to 17d. In addition, a recess 16 extending in a direction perpendicular to the axial direction of the upper shaft 2 is provided at the center of the receiving surface of each of the seats 16 and 17.
e and 17e are formed, respectively. and,
When assembling the upper shaft 2 into the arm portion 1a, after adjusting the position by appropriately sliding the second spherical metal 11 in the axial direction of the upper shaft 2, both spherical metals 8 and 11 are By placing it on the seats 16, 17, each spherical metal 8, 11 has its spherical surface aligned with the inclined surfaces 16a to 16d, 17 of each of the seats 16, 17.
a to 17d, and the second 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 1a in its axial direction and in a direction perpendicular thereto. It's becoming like that.

Support frame 1 for supporting the pattern selection mechanism
Reference numeral 8 denotes first and second support plates 19 and 20 as a pair of pressing plates located at both ends of the frame 18.
and a plurality of support shafts 21 and 22 installed between both support plates 19 and 20, supported by the one support shaft 21 at both end bent portions 23a, and supported by the one support shaft 21 at both side locking protrusions 23b. It consists of a construction plate 23 that is secured to each support plate 19, 20. Each support plate 1
Through holes 24 and 25 are formed at positions facing each other in the lower centers of the holes 9 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. 16e, 17e, and each support plate 19, 20 is loosely fitted into each spherical metal 8, 11.
It is designed to be able to integrally slide in the axial direction of the upper shaft 2 on annular surfaces 8a and 11a formed on the circumferential surface of the upper shaft 2. A pair of attachment pieces 26 (only one of the support plates 20 is shown) that protrudes laterally is integrally formed on each of the support plates 19 and 20. The support frame 18 is attached to a boss 28 in the arm portion 1a with screws 27 so that its position can be adjusted.

The construction plate 2 is mounted on the one support shaft 21.
A first swing link 29 is swingably supported inside each bent portion 23a of No. 3, and an extending piece 29a is formed on the rear side edge. First swing link 2
A connecting rod 3 disposed within the arm portion 1a in close proximity to 9.
A linking screw 30a is attached to the top of the linking screw 30a, and based on the engagement between the linking screw 30a and the extending piece 29a,
The first swing link 29 is operatively connected to a needle bar (not shown) via a connecting rod 30. Also,
On the front edge of the first swing link 29, a plurality of engaging portions 2 having different left and right widths are provided at predetermined intervals.
9b, 29c, and 29d are provided in a protruding manner. A second swing link 31 is swingably supported inside the first swing link 29 on the one support shaft 21, and the second swing link 31 is bent at the right side. It is operatively connected to a feed adjustment mechanism (not shown) at portion 31a. This second swing link 31
A plurality of extending pieces 31b, 31 are provided on the front edge of the first swing link 29 and extend forward between the engaging portions 29b, 29c, 29d or on the sides.
c, 31d are formed, and two extending pieces 31b, 3
An adjustment plate 33 is mounted on 1c with mounting screws 32. Further, as shown in FIG. 3, each adjustment plate 33 has an adjustment screw 34 for adjusting the mounting position of each adjustment plate 33 in cooperation with the mounting screw 32.
is attached.

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, the extending piece 31d and the adjustment plate 33 on each swing link 29, 31, and the other end is connected to each pattern cam 14a. A contact 36 that can be engaged and disengaged is rotatably supported. Each of the operating levers 3
An operation key 3 is provided at the top of the tip of the arm 1a and protrudes upward from the arm portion 1a through the through hole 37 of the construction plate 23.
8 is fixed, and a locking piece 39 is formed protruding from the tip of each operating lever 35. Also,
A spring hanging piece 42 and a regulating piece 43 are formed on the upper edge of each operating lever 35 to project upward through the slits 40 and 41 of the construction plate 23.

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. Based on the engagement between each spring piece 44a and the spring hanging piece 42 of each operating lever 35, each operating lever 35 is biased to rotate counterclockwise in FIG. 3. And always each spring piece 4
The locking corner portion 35a of each operating lever 35 engages the plate spring 44 through the through hole 37 based on the spring force of the lever 4a.
The operating levers 35 are engaged with the proximal edges of the operating levers 35, and each operating lever 35 is held in the inoperative position shown in FIGS. 2 and 3. In this state, as shown by solid lines in FIG. 3, each of the contacts 36 is disposed at a position where it is separated from the pattern cam 14a or each swing link 29, 31. Further, the plate spring 44 is formed with a row of elongated holes 44b that allow the restriction pieces 43 of each operating lever 35 to enter.

A locking plate 46 extending in the axial direction is provided on the other support shaft 22 so as to be positioned below each of the operating levers 35 at both ends 46a thereof between two positions shown by a solid line and a chain line in FIG. rotatably supported,
It is urged to rotate toward the solid line position by a spring (not shown). This locking plate 46 has each operating lever 3.
Elongated holes 47 with which the locking pieces 39 of No. 5 can be engaged are formed in a row, and a bent portion 48 is formed.
When the operation key 38 is selectively pressed down against the spring force of the spring piece 44a,
The operating lever 35 is rotated clockwise in FIG. 3, and the cam surface 3 of the locking piece 39 of the operating lever 35
9a and the bent portion 48, the locking plate 46 is moved to the third position against the spring force of a spring (not shown).
It is rotated to the chain line position in the figure. 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. 2
3 to prevent rotation of the operating lever 35. 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 chain line in FIG. 29b to 29d, the extension piece 31d, and the adjustment plate 33. When the upper shaft 2 is rotated in this state, the first or second swing links 29, 31 are swung via the cam contactor 36 according to the cam shape of the pattern cam 14a, and the needle bar or feed is adjusted. device is activated.

In addition, the operation lever 35, the cam contactor 36,
The leaf spring 44, the locking plate 46, etc. constitute a pattern selection mechanism, and this pattern selection mechanism can be assembled as a unit on the support frame 18.

When assembling the sewing machine configured as described above, as shown in FIG. 4 are in close contact with each other and are supported by the pin 3 and the retaining ring 10 so as not to be movable in the axial direction. 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, and A cylindrical member 12, a bush 13, and a cam body 14 are inserted into the upper shaft 2, and a retaining ring 15 prevents the members 12 to 14 from moving in the axial direction. Then, the second spherical metal 11 is slidably inserted into the upper shaft 2, and the second support plate 20 is inserted into the second spherical metal 11. Next, both support plates 1
The support shafts 21 and 22 are assembled to the support shafts 21 and 20, and the first and second swing links 29 and 31 are attached to the support shafts 21 and 22, and a large number of operation levers 35 having contacts 36, When the locking plate 46, the construction plate 23, etc. are assembled, the assembly of the pattern cam/pattern selection mechanism unit to the upper shaft 2 is completed.

When assembling this unit into the arm portion 1a, the positions of the first and second support plates 19, 20 and the second spherical metal 11 are adjusted by appropriately sliding them in the axial direction of the upper shaft 2. After that, the lower end protrusions of both support plates 19, 20 are inserted into the recesses 16e, 1 of each catch seat 16, 17.
7e, and each spherical metal 8, 11 is loosely fitted to the inclined surface 16a~ of each seat 16, 17.
16d, 17a to 17d, positioning of the second spherical metal 11 in the axial direction of the upper shaft 2 and positioning of the upper shaft 2 with respect to the arm portion 1a.
can be easily positioned. At this time,
When each contact 36 is not in a predetermined positional relationship with each pattern cam 14a, the recesses 16e, 17
By sliding both support plates 19, 20 on the annular surfaces 8a, 11a of the spherical metals 8, 11 in the axial direction of the upper shaft 2 within the range regulated by e, each contactor for each pattern cam 14a is 36 can be easily and reliably positioned. After this positioning work is completed, each support plate 19, 20 is tightened and fixed to the boss 28 through the mounting hole of the mounting piece 26 with the screw 27, and each spherical metal 8, 11 is fixed to each support plate 19, 20 by each support plate 19, 20. It is pressed and fixed to the seats 16 and 17, and the assembly of this unit is completed.

In a sewing machine assembled as described above,
The load of the pattern selection mechanism is applied to the first and second support plates 19,
20, the upper shaft 2 can be smoothly rotated because it is transmitted to the first and second seats 16, 17 via the first and second spherical metals 8, 11.

Further, in place of the seat 16 in the first embodiment, as shown in FIG. 5, an inverted conical curved surface 50a and a recess 50b corresponding to the recesses 16e and 17e in the first example are formed. It is also possible to employ the catch 50, which has the advantage that the catch 50 is easier to mold or process than the catch 16.

Note that the present invention is not limited to the above-mentioned embodiments, and the receiving surface of each catch may be formed by three inclined surfaces in the shape of an inverted triangular pyramid, or the multi-contact type pattern selection mechanism may be replaced by a single contact. Changing to child type, etc.
It is also possible to arbitrarily change the configuration of each part without departing from the spirit of the invention.

Effects As detailed above, the present invention has a support frame that supports the pattern selection mechanism placed on a bearing metal for the upper shaft so as to be slidable in the axial direction of the upper shaft. The support frame is fixed to the sewing machine frame so that its position can be adjusted in the axial direction of the upper shaft so that the contact of the pattern selection mechanism has a predetermined positional relationship with respect to the pattern cam, thereby allowing smooth rotation of the upper shaft. It is possible to easily position the contactor with respect to the pattern cam in a short time without interfering with the pattern selection mechanism, and because the pattern selection mechanism is made into a unit, it can be positioned with respect to the pattern cam without being affected by the dimensional accuracy of the catch on the sewing machine frame. The pattern selection mechanism can be positioned by By supporting the upper shaft unit including the pattern cam and the pattern selection mechanism on the sewing machine frame via a common bearing metal, the number of parts can be reduced. It has excellent effects such as being able to efficiently arrange the objects.

[Brief explanation of the drawing]

Fig. 1 is a front sectional view showing the main parts of a sewing machine embodying the present invention, Fig. 2 is a side sectional view of the main parts, Fig. 3 is an enlarged sectional view of the main parts, Fig. 4 is a partially exploded perspective view, and Fig. 4 is a partially exploded perspective view. 5
The figure is an exploded perspective view of a catch showing a second embodiment. Sewing machine frame...1, upper shaft...2, first and second spherical metals as bearing metals...8,1
1. First and second seats...16, 17, Inclined surfaces...16a to 16d, 17a to 17d, recesses...
16e, 17e, Support frame...18, First and second support plate...19, 20, Through hole...24,
25, Operation lever...35, Contactor...36, Leaf spring...44, Locking plate...46 (above 35, 3
6, 44, 46 etc. constitute a pattern selection mechanism), catch...50, curved surface...50a, recess...50b.

Claims (1)

[Scope of Claims] 1. A pattern cam 14a rotatably disposed on the upper shaft 2 together with the upper shaft 2 supported on the sewing machine frame 1 via two bearing metals 8 and 11;
A pattern selection mechanism (35, 36, 44,
46 etc.), and the support frame 18 is slidable in the axial direction of the upper shaft 2 on both the bearing metals 8 and 11.
is mounted on the support frame 18 such that the position thereof can be adjusted in the axial direction of the upper shaft 2 so that the contactor 36 has a predetermined positional relationship with respect to the pattern cam 14a.
is fixed to the sewing machine frame 1. 2. The sewing machine according to claim 1, wherein a large number of the pattern cams 14a are arranged on the upper shaft 2, and a large number of the contacts 36 are arranged on the support frame 18 in correspondence with each pattern cam 14a. . 3 Both of the bearing metals 8 and 11 are formed into a spherical shape, one of which metals 8 is fixed at a predetermined position on the upper shaft 2, and the other metal 11 is arranged so as to be slidable in the axial direction of the upper shaft 2. The receiving surfaces of seats 16 and 17 provided on the sewing machine frame 1 to receive the bearing metals 8 and 11 have a V shape in the axial direction of the upper shaft 2 and in the direction perpendicular thereto.
Four letter-shaped inclined surfaces 16a to 16d, 17a
17d. The sewing machine according to claim 1, wherein the sewing machine is formed by 17d. 4. The support frame 18 has support plates 19, 20 at both ends thereof, and the bearing metal 8,
A recess 16e is formed in the center of the receiving surface of the seats 16 and 17 so that the support plates 19 and 20 can slide in the axial direction of the upper shaft 2 on the bearing metals 8 and 11. , 17e are formed. . . . 17e.