JPH0117256Y2 - - Google Patents

Description

[Detailed description of the invention] Industrial application field This invention relates to a pattern cam selection device for a sewing machine, and more specifically, a drum-shaped rotating body is rotated relative to the pattern cam to select a desired pattern. In a zigzag pattern sewing machine that controls the amplitude of a sewing needle and the feed of a workpiece cloth using a rotary contact mechanism to select, means for surely maintaining the relative position of the rotary body and the pattern cam in the pattern cam selection contact mechanism. The present invention relates to a pattern cam selection device which is configured to prevent the inconvenience that the rotating body is rotated along with the rotation of the pattern cam during operation of the sewing machine.

Prior Art In a zigzag pattern sewing machine, when sewing a zigzag pattern, it is necessary to control the needle oscillation and also to give the workpiece cloth a controlled feed in the forward direction (as well as feed in the reverse direction at the required timing in the case of a super pattern). . In order to appropriately control the amplitude of the sewing needle and the amount of feed of the feed dog, there are known sewing machines that employ a rotary contact mechanism that selects a desired pattern by rotating a drum-shaped rotating body relative to the pattern cam. ing. That is, this sewing machine includes a large number of pattern cams that rotate in synchronization with the main shaft of the sewing machine, and a rotating body that is provided with a large number of contact protrusions that respectively correspond to the large number of pattern cams and can be engaged with and separated from the pattern cams. , by operating the pattern selection dial and rotating the rotating body, one protrusion of the plurality of contact protrusions is engaged with a desired cam of the plurality of pattern cams, and the cam movement is controlled by needle vibration. The information is transmitted to the mechanism and the feed adjustment mechanism to perform needle swing control and feed control.

Problems to be Solved by the Invention In a sewing machine employing the rotary contact mechanism described above, during sewing operation of the sewing machine, the pattern cam, which is synchronously rotated by the main shaft of the sewing machine, contacts the rotating body that engages with the pattern cam. The rotary body is sometimes forced to rotate along with the protrusion, which has the disadvantage of disrupting a preselected pattern.

Purpose of the invention This invention was proposed in view of the above-mentioned problems that have conventionally existed in pattern cam selection devices of sewing machines. Even if the pattern cam is rotated at high speed by the main shaft of the sewing machine, the purpose of the present invention is to prevent the rotating body from rotating in a follow-up manner via the contact protrusion that engages with the pattern cam.

Means for Solving the Problems In order to solve the above problems, the pattern cam selection device of the present invention includes a support frame that rotatably supports a rotating body that is rotatable around an axis parallel to the pattern cam; A large number of locking grooves corresponding to the large number of contact protrusions of the rotating body are formed, and the locking body is supported on the support frame so as to rotate integrally with the rotating body; A locking pawl supported on the support frame so as to be able to engage and disengage from the locking groove of the locking body to maintain the rotational position, and the locking pawl engages with the locking groove. an elastic body that constantly biases the locking pawl, and operation of a pattern selection operation body to detach the locking pawl from the locking groove against the elastic force of the elastic body when the rotating body rotates. and an operating member that acts on the locking pawl in conjunction with the locking pawl.

Operation When the pattern selection operating body is operated to select a pattern, the locking pawl disengages from the locking groove of the locking body in conjunction with the operation, and the rotating body is thereby linked to the operation of the pattern selection operating body. and rotate to engage the contact protrusion with the desired pattern cam. When the desired pattern cam and the contact protrusion engage, the locking groove reaches a position where it can engage with the locking pawl, and the two are engaged by the action of the elastic body, ensuring the rotational position of the rotating body. is maintained.

Embodiments Next, a preferred embodiment of the sewing machine pattern cam selection device according to the present invention will be described in detail with reference to the accompanying drawings. FIG. 1 is a front view partially showing the front side of a sewing machine frame of a multi-pattern stitch sewing machine in which a pattern cam selection device according to an embodiment of the present invention is installed; FIG. 2 is a plan view showing the internal mechanism thereof; Third
The figure is a right side view as seen from the direction of arrow A in Fig. 2, Fig. 4 is a longitudinal sectional view taken from the - line direction in Fig. 2, and Fig. 6 is a longitudinal sectional view partially omitted from the - line in Fig. 2. .

The multi-pattern stitch sewing machine equipped with the pattern cam selection device according to the present embodiment is a mechanically developed version of the zigzag sewing machine, in which the sewing needle is moved vertically and reciprocally, and at a predetermined amplitude in the lateral direction. It has a built-in known swinging mechanism that can swing the needle. It is also equipped with a feeding device that not only feeds the workpiece cloth in the forward direction, but also feeds it in the reverse direction at the required timing, and with respect to the feeding movement by this feeding device, the first pattern group that can be formed only by the forward feeding movement is provided. A desired pattern can be selectively sewn from a large number of patterns consisting of a second pattern group that can be formed by forward and reverse feeding movements. In other words, the first pattern group is a simple zigzag pattern obtained by combining the needle swing motion and the movement of feeding the work cloth in the forward direction, and the second pattern group is a so-called super pattern, obtained by combining the needle swing motion and the movement of feeding the work cloth in the forward direction. This is obtained by combining the movement of the work cloth with the movement of feeding the work cloth in both forward and reverse directions.

An outline of the mechanism for realizing zigzag pattern sewing and super pattern sewing, and details of a device for selecting pattern cams in connection therewith will be explained below. In the figure, a support shaft 3 supported horizontally between the inner wall of a sewing machine frame 1 and a vertical support plate 2 has an amplitude control cam 4 formed with a large number of cam rows in the direction of the outer circumferential axis of a cylindrical body, and a super pattern is sewn onto the support shaft 3. A feed control cam 5 that operates to control the direction of the feed movement when sewing a buttonhole, and a buttonhole feed cam 6 that operates only when sewing a buttonhole are coaxially and rotatably supported. The rotation of these series of cam groups 4, 5, and 6 (generally called pattern cams) is caused by the engagement between a worm 8 fixed to the sewing machine main shaft 7 and a worm wheel 9 arranged adjacent to the pattern cam 4. This is applied in synchronization with the rotation of the main shaft 7 of the sewing machine.

As shown in FIG. 2, support frames 11 and 12 consisting of two U-shaped frames are rotatably supported on a drive shaft 10, which is rotatably arranged in parallel with the support shaft 3. ing. A cylindrical amplitude contact body (hereinafter referred to as Z contact body) 14 is rotatably supported on one of the support frames 11 via an independent rotating shaft 13.
Contact protrusions 15 protruding from the outer periphery of the contact body 14 at appropriate intervals are capable of engaging and disengaging from the amplitude control cam 4. As shown in FIG. 4, a tension spring 16 is elastically engaged with the support frame 11 to constantly tension and bias the support frame 11 in a counterclockwise direction about the drive shaft 10. Further, a hook-shaped link lever 19 connected to a connecting rod 18 constituting a part of the needle oscillation mechanism is loosely attached to the end of the arm piece 17 fixed to the support frame 11 via a pin 20. That is, in FIG. 4, the amplitude control cam 4 rotates under the rotational action of the upper shaft 7,
When the Z contact body 14 is actuated by the cam, the support frame 11 swings around the drive shaft 10, and the link lever 1
9 and a connecting rod 18 to laterally swing a needle bar and a sewing needle (none of which are shown).
Note that reference numeral 21 indicates a manually operated sewing needle amplitude adjustment lever.

In addition, the other support frame 12 is provided with figures 2 and 6.
As shown in the figure, a feeding contact body (hereinafter referred to as S contact body) 23 has a contact protrusion 22 formed on the circumferential surface of a disc.
A buttonhole contact body (hereinafter referred to as B contact body) 24 is rotatably supported via another rotating shaft 25. This S contact body 23 is configured so that its contact protrusion 22 can be switched between two positions in which it can engage and disengage from the feed control cam 5. It functions as a connection control mechanism that connects and disconnects between the controller and a feeding device 26 (described later). Note that the series of contact bodies described above, namely the Z contact body 14 as an amplitude contact body and the S contact body 2 as a feeding contact body,
3 and the B contact body 24 as a buttonhole contact body are both rotatable around an axis parallel to the rotation axis of the pattern cam, and therefore they are collectively referred to as a "rotating body."

A protruding piece 2 integrally formed on the support frame 12
7, as shown in FIGS. 2 and 6, is inserted through and connected to a press rod 28 that connects and operates a feed device 26 disposed on the pillar portion of the sewing machine frame 1;
A compression spring 29 elastically inserted into this pressing rod 28
As a result, the support frame 12 is always pushed up counterclockwise around the drive shaft 10. The feed device 26 is configured to reverse the direction of the feed movement of the feed dog when the press rod 28 is urged downward.

As shown in FIG. 2, a dial shaft 3 is provided between the sewing machine frame 1 and the support plate 2 in parallel with the drive shaft 10.
0 is arranged so that it can rotate in both forward and reverse directions within a predetermined central angle, and a pattern selection dial 31 is rotatably mounted on one end of this dial shaft 30. A cylindrical recess 32 is formed in the end surface of the pattern selection dial 31 that protrudes outward from the sewing machine frame 1, and an operating member 33 consisting of a knob shown in FIGS. 1 and 2 is formed in the recess 32. is stored. This operating member 33 is used for switching between a zigzag pattern and a super pattern, and is provided at two designated positions P ₁ corresponding to a first display area D ₁ and a second display area D ₂ , which will be described later. , within the range of P ₂ ,
It is designed to be able to rotate in both forward and reverse directions. That is, the operating member 33 is located in a recess 32 formed in the pattern selection dial 31 and is fixed to one end of the dial shaft 30.
A switching lever 34 having the shape shown in FIG. 6 and FIG.
is inserted and fixed, and this switching lever 34 is pivotally attached to one end of a link member 35 with a pin.
Further, teeth 37 of a switching gear 36 having the shape shown in the drawing and rotatably supported on the drive shaft 10 engage with teeth 38 integrally formed on the outer periphery of the S contact body (connection control mechanism) 23. At the same time, the switching gear 36 is pivotally attached to the other end of the link member 35 by a pin. In this way, the switching lever 34 and the link member 35
and the switching gear 36 constitute a switching member.

Further, a large diameter spur gear 39 is coaxially fixed to the pattern selection dial 31 as shown in FIG. 2, and this spur gear 39 meshes with a spur gear 40 coaxially fixed to the drive shaft 10. As shown in FIGS. 2 and 4, two contact drive gears 41 and 42 are inserted and fixed to the drive shaft 10 at a predetermined distance apart. And one drive gear 41 is Z
The other drive gear 42 meshes with the teeth 43 integrally formed on the contact body 14 (FIG. 4), and the other drive gear 42
It meshes with a tooth portion 44 formed integrally with the cylindrical member 4. Therefore, when the pattern selection dial 31 is rotated, for example, clockwise, the drive shaft 10 is rotated counterclockwise due to the engagement of the spur gears 39 and 40, and the drive gear 41 rotates the Z contact body 14 and the drive shaft 10. It is understood that the gear 42 rotates the B contact body 24 clockwise (in this case, the Z contact body 14 and the B contact body 24 are rotated by the locking claws 55z and 55b by the release mechanism described later). (It is designed to release the engagement).

As shown in FIGS. 2 and 4, the drive shaft 10
A release frame 45 having the shape shown in the drawing, which clamps the support frame 11 that supports the Z contact body 14, is rotatably inserted through the frame. This release frame 45 is
The drive shaft 1 is elastically tensioned by a tension spring 47 engaged between a hook 46 protruding from the support plate 2.
It is constantly lifted and biased counterclockwise around zero. Further, a release cam 48 in the shape of a five-petal flower shown in FIGS. 4 and 5 is integrally molded on the back surface of the dial 31 inserted into the dial shaft 30 (the side facing into the sewing machine frame 1). ,
A release pin 49 protruding from an arm 51 extending from the release frame 45 is in contact with the sliding surface of the release cam 48 . Further, another release cam 50 having a shape shown by a two-dot chain line in FIG. 6 is fixed to the dial shaft 30, and similarly contacts the release pin 49. This release cam 50 has a shape corresponding to one petal portion of the five-petal shaped release cam 48. The reason for this is that the latter release cam 50 moves the operating member 33 to swing the release frame 45 and release the fixation of the S contact body 23, but the rotation angle will be described later. Two designated positions P ₁ and P ₂ corresponding to the first display area D ₁ and the second display area D ₂ respectively.
This is because the rotation angle is limited to 72° (=360°/5) within the range of . In any case, by rotating the pattern selection dial 31, the 5-valve release cam 4
8 rotates, causing the release frame 45 to instantaneously swing and return clockwise about the drive shaft 10. Further, when the operating member 33 is rotated, another release cam 50 is rotated, and the release frame 45 is also instantaneously swung clockwise and returned to its original position.

Note that each of the support frames 11 and 12 is provided with the Z contact body 1.
4. A means for restricting free rotation of the rotating bodies such as the S contact body 23 and the B contact body 24 is provided. For example, as shown in FIGS. 2 and 6 to 8, a locking body 52s that rotates integrally with the S contact body 23 is arranged adjacent to the S contact body 23, and this locking body 52s
A number of locking grooves (consisting of square grooves) 53 corresponding to the number of teeth 38 of the S contact body 23 are formed on the outer periphery of the S contact body 23 . A locking pawl 55s swingably supported on the support frame 12 via a pivot 54 is attached to the locking groove 5.
3 to maintain the rotational position of the S contact body 23. In this case, an elastic body 56 made of a coil spring is inserted into the pivot shaft 54, and the square end formed at the tip of the locking claw 55s is connected to the locking groove 55.
It is always elastically biased to engage with 3.

Further, the locking body 52s has another groove 57 formed therein at the same intervals as the plurality of locking grooves 53 and having the same number. The another groove 57 is formed by the rotating bodies 14, 23.
The elastic piece 58s is screwed to the support frame 12, and the chevron-shaped slope formed at the tip of the elastic piece 58s is elastically engaged with the chevron-shaped groove 57. Thus, the position of the S contact body 23 is regulated. Furthermore, similar configuration,
That is, the locking body 52, the locking groove 53, the locking claw 55,
Elastic pieces 58 and chevron-shaped grooves 57 are also provided on the Z contact body 14 and the B contact body 24, respectively. Therefore, the aforementioned locking body 52 and locking claw 55 shown in the attached drawings
In order to clarify the correspondence with each rotating body of the S contact body 23, Z contact body 14, and B contact body 24, the elastic piece 58 has s, z, and b at the end of the code indicating the corresponding member, respectively. are marked with lowercase letters. For example, in FIG. 5, the locking body related to the Z contact body 14 is numbered 52z, the locking pawl is numbered 55z, and the elastic piece is numbered 58z to further clarify their correspondence. .

Further, in order to release the rotation restriction means, the locking claw 5 is pressed in conjunction with the operation of the pattern selection dial 31.
5(z, s, b) is provided on the release frame 45. That is, as shown in FIG. 3, two adjustment screws 59 and 6 are provided at required positions on the release frame 45 as the operating members.
0 are screwed in so that they can move forward and backward, respectively, and the locking claws 55
The lower end of the screw faces above a tongue piece 61 that integrally extends from the lower end. As mentioned above, the release frame 45 is designed to be able to instantaneously swing clockwise, so that when the release frame 45 swings, the adjustment screws 59 and 60 move the tongues 61 of the corresponding locking claws 55. The locking pawl 55 is disengaged from the locking groove 53 to release the locking groove (particularly as shown in FIGS. 6 to 6).
(See Figure 8).

Next, as shown in FIG. 1, a long display board 62 is arranged and fixed on the front side of the sewing machine frame 1 so as to extend in the lateral direction. This display board 62 displays a first pattern that displays each pattern in a first pattern group (zigzag pattern) that can be formed only by forward feeding motion.
The display area D ₁ and the second display area D 2 that displays each pattern in the second pattern group (super pattern) that can be formed by forward and reverse feeding movements are arranged in the upper and lower ₂ directions.
It is located on steps. Further, the first display area
The position corresponding to D ₁ is the dial display cover 63
The position corresponding to the second display area D ₂ is designated as P ₂ on the dial display cover ₆₃ . As described above, the operating member 33 is located at the two designated positions within the recess 32 of the pattern selection dial 31.
It is possible to move between P ₁ and P ₂ .

A plurality of display windows 64 are opened at predetermined intervals between the display areas D ₁ and D ₂ on the display board 62, and the display windows 64 move in conjunction with the operation of the pattern selection dial 31 through the display windows 64. The indicator 65 is now visible. For example, as shown in FIG. 2, a timing belt 68 is rotatably stretched around a timing pulley 66 fixed to the front end of the drive shaft 10 and an idle pulley 67 pivotally supported at the end of the support plate 2. Three indicators 65 are arranged at appropriate locations. In addition, a transparent window 69 is provided in the dial display cover 63 of the pattern selection dial 31, so that a numerical number attached to a selection display board 70 (described later) disposed inside can be visually recognized from the outside. The numbers individually indicate the types of zigzag patterns shown on the display board 62). To explain the outline of the mechanism for rotating the selection display plate 70 to determine a desired numerical number, as shown in FIG. Three planet gears 7 are fixed unrotatably and mesh with the internal teeth of this internal gear 71.
A second rotating shaft is pivotally connected to the selection display plate 70. Furthermore, since the planet gear 72 meshes with teeth formed at the base of the pattern selection dial 31, planetary motion is applied to the selection display plate 70 by rotating the pattern selection dial 31.
Rotation indexing of the selection display board 70 is performed.

Function Next, the function of the multi-pattern sewing machine configured as described above will be explained. It is now assumed that the operating member 33 is located at a designated position P ₁ corresponding to the first display area D ₁ as shown in FIG. In this case, as shown in FIG. 6, the connection control mechanism 23 made of an S contact body is in a position where it does not engage the feed control cam 5, and the connection with the feed device 26 is cut off. If the pattern selection dial 31 is rotated in this state, the release cam 48 will move to the release pin 49.
The release frame 45 is urged through the
oscillate clockwise. As a result, the adjusting screws 59, 60 are adjusted to the Z contact body 14 and the B contact body 2.
4, the locking claws 55z, 55b are rotated clockwise against the elasticity of the elastic body 56, and the locking grooves are rotated clockwise against the elastic body 56. 53. Further, as the pattern selection dial 31 is rotated, the pair of spur gears 39 and 40 engage and operate, thereby rotating the drive shaft 10. As a result, the two drive gears 41 and 42 rotate, and the corresponding Z contact body 1 is rotated.
4 and B contact body 24 to select a desired cam (ie, a desired pattern). At this time, the locking claws 55z, 5 for the locking bodies 52z, 52b
Since the engagement by 5b has already been released, the elastic pieces 58z and 58b are elastically bent to fit into the chevron groove 57.
, thereby allowing stepwise rotation of the Z contact body 14 and the B contact body 24. Note that as a result of the elastic piece 58 being able to be elastically engaged with the chevron-shaped groove 57, even if the locking pawl 55 does not completely engage with the locking groove 53 and the relative positions of the two do not align, Even if such a case occurs, the elastic piece 58 biases the rotating bodies 14, 23 to rotate due to its elasticity. Therefore, the locking pawl 55 is preferably engaged with the locking groove 53 in a reliable manner.

Further, under the operation of the planetary gear mechanism, the selection display plate 70 within the pattern selection dial 31 rotates to index the numerical number of the selected cam. Further, the timing belt 68 rotates in conjunction with the operation of the pattern selection dial 31, bringing the index 65 to the position of the display window 64 formed in the display plate 62, and instructing the numerical number of the selected cam. .

After this pattern selection is completed, when the upper shaft 7 of the sewing machine is rotated, the amplitude control cam 4 which is in worm engagement with the upper shaft 7 of the sewing machine rotates, and the support frame 11 is swung under the action of engagement with the Z contact body 14. , the amplitude of the sewing needle is controlled via the link lever 19 and the connecting rod 18. In this case, the feed device 26 does not operate, so that the work cloth is fed only in the forward direction, and a so-called zigzag pattern is sewn.

Next, when the operating member 33 is rotated counterclockwise in FIG. 1, the operating member 33 comes to the designated position _P2 corresponding to the second display area _D2 . At this time, another release cam 50 provided on the dial shaft 30 cam-operates the release frame 45 via the release pin 49, causing it to momentarily swing clockwise. As a result, the adjustment screw 60 provided on the release frame 45 comes into contact with the tongue piece 61 of the locking claw 55s corresponding to the S contact body 23, and the locking claw 55s
is rotated clockwise against the elasticity of the elastic body 56. Therefore, the engagement of the locking claw 55s with the locking groove 53 of the S contact body 23 is released.

In addition, the switching lever 3 fixed to the dial shaft 30
4. The switching member consisting of the connecting rod 35 and the switching gear 36 changes from the state shown in FIG. 6 to the state shown in FIG. 7 and then to the state shown in FIG. 8 as the dial shaft 30 rotates counterclockwise. The state changes to the state shown. As a result, the switching gear 36 gear-drives the S contact body 23 clockwise, and the contact protrusion 2 formed on this S contact body 23
2 is engaged with the feed control cam 5. That is, the feed control cam 5 and the feed device 26 are mechanically connected (also in this case, since the engagement with the S contact body 23 by the locking claw 55s has already been released, the elastic piece 58s is elastically bent to form a chevron groove 57
, and allows the stepwise rotation of the S contact body 23).

When the pattern selection dial 31 is rotated in this state, the rotation of the drive shaft ₁₀ causes the two drive gears 41, 42 rotates,
A desired pattern is selected by rotating the corresponding Z contact body 14 and B contact body 24, respectively. In this case as well, the selection display board 70 in the pattern selection dial 31 determines the numerical number of the selected cam, and the indicator 65 arrives at the display window 64 of the display body 62 in conjunction with the operation of the dial 31. , indicates the numerical number of the selected cam.

Next, when the main shaft 7 of the sewing machine is rotated, the amplitude control cam 4 rotates, swinging the support frame 11 under the action of engagement with the Z contact body 14, and the sewing needle is Amplitude control is performed. Further, the feed control cam 5 is connected to the Z contact body 14.
When rotated together, the connection control mechanism (S contact body) 23, which engages with the cam, swings the support frame 12 clockwise at a predetermined timing, and the protruding piece 2
7 and the push rod 28, the feeding device 26 is biased into operation. As a result, the work cloth is fed in both forward and reverse directions, and a super pattern is formed by combining this with the swinging movement of the sewing needle whose amplitude is controlled.

Effects According to the present invention, a rotary contact mechanism is adopted that selects a desired pattern by rotating a drum-shaped rotating body with respect to a pattern cam, and a zigzag pattern is used to control the amplitude of the sewing needle and the feed of the work cloth. In a sewing machine, a locking pawl supported on a support frame and a locking body disposed adjacent to the rotating body are locked as a rotation regulating means that reliably maintains the relative position of the rotating body and the pattern cam. The rotational position of the rotating body is reliably maintained under the engagement action of the two grooves. Therefore, even if the pattern cam rotates during operation of the sewing machine, the rotating body will not be rotated accordingly, thus preventing an unforeseen situation in which the pre-selected pattern goes out of order. It is possible.

Further, when a pattern selection operation is performed to rotate the rotary body, the locking pawl is configured to separate from the locking groove, so that the switching operation can be performed with a light touch.

[Brief explanation of the drawing]

The drawings show a preferred embodiment of the multi-pattern sewing machine according to the present invention, and FIG. 1 is a front view partially showing the front side of the machine frame of the multi-pattern sewing machine according to the embodiment. Fig. 2 is a plan view showing the internal mechanism, Fig. 3 is a right side view seen from the direction of arrow A in Fig. 2, Fig. 4 is a longitudinal sectional view taken from the - line direction in Fig. 2, and Fig. 5 is a release. A partially omitted cross-sectional view showing the amplitude control cam and the contact protrusion of the amplitude contact body with the frame broken away, FIG. 6 is a longitudinal cross-sectional view partially omitted along the - line in FIG. The figures are explanatory views showing the operating states of the switching members, respectively. 4, 5, 6... Pattern cam (amplitude control cam, feed control cam, buttonhole feed cam), 7... Main shaft, 11, 12... Support frame, 14, 23, 24...
...Rotating body (amplitude contact body, feed contact body, buttonhole contact body), 15, 22...Contact protrusion, 3
1... Pattern selection dial, 52... Locking body, 53
...Latching groove, 55...Latching pawl, 56...Elastic body,
57...Chevron groove, 58...Elastic piece, 59,60...
...adjustment screw, D ₁ ...first display area, D ₂ ...second
Display area, P ₁ , P ₂ ...indicated position.

Claims (1)

[Claims for Utility Model Registration] (1) A large number of pattern cams 4 and 5 rotate in synchronization with the rotation of the sewing machine main shaft 7, and are rotatable around an axis parallel to the rotation axis of the pattern cams 4 and 5. rotating bodies 14, 23, and formed on the outer peripheral surfaces of the rotating bodies 14, 23, corresponding to the plurality of pattern cams 4, 5, respectively, and spaced apart in the direction of the rotation axis of the rotating bodies 14, 23. , is provided with a large number of contact protrusions 15 that can be engaged with and disengaged from the pattern cams 4 and 5, and by rotating the rotation bodies 14 and 23 in conjunction with the operation of the pattern selection operation body 31,
In a sewing machine that forms a pattern by engaging one protrusion among the plurality of contact protrusions 15 with a desired cam among the plurality of pattern cams 4 and 5, the rotating bodies 14 and 23 are rotatably supported. A support frame 11 pivotally supported on the sewing machine frame 1 for the purpose of
12, and a large number of locking grooves 53 corresponding to the large number of contact protrusions 15, respectively, are formed, and the rotating bodies 14, 2
The support frame 11,
12, and the locking bodies 52, 52 are supported on the locking bodies 14, 23 in order to maintain the rotational positions of the rotating bodies 14, 23. A locking pawl 55 supported on the support frames 11 and 12, and an elastic body 56 that constantly biases the locking pawl 55 so that the locking pawl 55 engages with the locking groove 53.
and, when the rotating bodies 14 and 23 are rotated in conjunction with the operation of the pattern selection operation body 31, the locking pawl 55 is removed from the locking groove 53 against the elastic force of the elastic body 56. An operating member 5 that acts on the locking pawl 55 in connection with the operation of the selection operation body 31
A pattern cam selection device for a sewing machine comprising: 9 and 60. (2) The locking body 52 has the plurality of locking grooves 53.
A large number of other grooves 57 are formed at the same intervals,
An elastic piece 58 that can engage with the other groove 57 is fixed to the support frames 11 and 12, and the locking claw 55
Practical use characterized in that the rotating bodies 14, 23 are biased to rotate by elastic engagement between the another groove 57 and the elastic piece 58 so that the elastic pieces 58 are in a relative positional relationship in which they can be engaged with the locking groove 53. Scope of patent registration request No. 1
A pattern cam selection device for a sewing machine as described in Section 1. (3) The locking groove 53 is composed of a square groove having the same width as the engagement tip of the locking pawl 55, and the other groove 57 is formed toward the center of rotation of the rotary bodies 14, 23. Utility model registration claim 2, characterized in that the elastic piece 58 is formed of a narrow slanted groove, and the tip of the elastic piece 58 is formed with an slanted surface that can be engaged with the slanted groove 57. Pattern cam selection device for the sewing machine described.