JPH0710310B2 - Cloth sewing machine for cycle sewing machine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Object of the Invention (Industrial field of application) The present invention relates to a cloth presser for a cycle sewing machine, particularly a bartacking sewing machine.

(Prior Art) Conventionally, this type of sewing machine is provided with a feed drive cam that is driven by being decelerated from the upper shaft of the sewing machine main body, and with a pattern set on both sides of this cam, a predetermined pattern is created by combining in the X and Y directions. The cloth feed arm was moved and a kind of pattern sewing was performed. As such a device, a cycle sewing machine described in Japanese Utility Model Publication No. 56-50380 is known. In such a conventional bar-tacking sewing machine, the feed pattern generated from one feed drive cam can only be one type of lateral bar-tacking sewing. Therefore, when there are several kinds of bartacking points such as horizontal bartacking and vertical bartacking in one sewing work piece, it is necessary to remove the sewing workpiece from the sewing machine and change the position and the direction of the bartacking piece each time.

In order to solve such a work problem, a cycle sewing machine having a feed pattern switching device capable of changing the lateral bartacking stitch to the vertical bartacking stitch without replacing the feed drive cam has appeared. Switching of the feed pattern may be performed electronically or mechanically. It is possible to easily change the lateral bartacking stitch to the vertical bartacking stitch by operating the feed pattern switching device. It is possible.

(Problems to be solved by the invention) However, a cloth presser device for pressing a sewing workpiece usually has needle holes for lateral bar tacking stitches formed and is changed to vertical bar tacking stitches. Had to be replaced with a cloth presser having a needle bar for vertical bar tacking.

As described above, even if the cloth feed mechanism can be easily changed to the vertical and horizontal feeds, the cloth presser cannot be changed correspondingly. Therefore, it is necessary to replace the cloth presser each time, and there is a problem that it is complicated. there were.

[Configuration of Invention] (Means for Solving Problems) The present invention has been devised in view of the above problems, and its gist is a feed cam or a feed cam for generating a plurality of feed patterns for a cloth feed arm. In a cycle sewing machine including an electronic control unit and a feed pattern switching device capable of changing the lateral bar tacking sewing of the cloth feeding arm to the vertical bar tacking sewing, the cloth feeding arm is held so that it can move up and down. A main body and a cloth retainer piece rotatably held by the main body of the cloth retainer and having a unidirectional needle hole in the center, and the feed pattern switching device is either horizontal bartack stitch or vertical bartack stitch. And the needle bar of the cloth presser piece is set so that the needle hole of the cloth presser piece is set to either the corresponding lateral bartacking stitch or vertical bartacking stitch. A switch for connecting with the operation member of the feed pattern switching device. In that a connecting member.

Since the switching connecting member is connected between the work clamp and the operation member of the feed pattern switching device, even if the feed pattern switching device is operated and the pattern is changed from horizontal bar tack sewing to vertical bar tack sewing. , Since the cloth feed piece rotates with respect to the work clamp body in conjunction with the feed pattern switching device and the needle hole of the work clamp piece is set from the horizontal bar tacking position to the vertical bar tacking position, the feed pattern switching By simply operating the operating member of the apparatus, the horizontal bartacking can be immediately performed and the vertical bartacking or the reverse pattern sewing can be easily performed.

(Detailed Description of Configuration of the Invention) The device of the present invention is applied to a cycle sewing machine including a feed cam or an electronic control unit for generating a plurality of feed patterns. The sewing machine with a feed cam is a mechanical type,
A cycle sewing machine having a feed pattern switching device capable of changing from horizontal bartacking to vertical bartacking without changing the feed cam. The sewing machine having an electronic control unit is a cycle sewing machine having a computer-controlled actuator. Note that these cycle sewing machines are already known.

The device of the present invention is composed of a cloth pressing body, a cloth pressing piece, and a switching connecting member. The presser foot main body may be a pair of left and right having an attachment portion at the upper end that fits vertically into the attachment hole of the cloth feed arm and a race groove at the lower end surface. The cloth presser piece is fitted in a race groove of the cloth presser body and is rotatably held in the cloth presser body in a horizontal plane around a needle hole provided in the center part, and is divided into left and right parts in the center part. The pair of cloth pressing portions and the elastic member that connects the pair of cloth pressing portions to the pair of cloth pressing pieces independently of each other so as to be vertically movable. The switching connecting member has one end fixed to a peripheral extension end of the cloth pressing piece, and the other end is connected to a switching knob of the feed pattern switching device, and is interlocked with the rotation operation of the switching knob to extend through the extension end. The cloth presser piece can be composed of a wire hooked so as to rotate relative to the cloth presser body at a predetermined position, that is, from the horizontal bartacking stitching position to the vertical bartacking stitching position. When the lateral bar tacking sewing feed pattern is switched to the vertical bar tacking sewing feed pattern by switching the switching knob of the feed pattern switching device, the cloth presser piece of the work clamp device is laterally bar-tacking in conjunction with this switching operation. Rotate 90 ° from the sewing position to the vertical bar-tacking sewing position, and the needle hole of the work clamp foot can be switched from the horizontal bar-tacking needle hole to the vertical bar-tacking needle hole position. Therefore, at the same time when the feed pattern is switched, the work clamp is also switched to the needle hole position corresponding to the pattern.

The switching connecting member for connecting the cloth pressing piece and the feed pattern switching device may be mechanically linked by a wire, and the operation member of the feed pattern switching device and the rotation of the cloth pressing piece may be linked. It may be electrically connected to.
The point is that the cloth pressing piece is rotated at the same time when the feed pattern is switched, and the position of the corresponding needle hole is set.

[Embodiment] An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 is an external perspective view of the cycle sewing machine of this embodiment, in which a sewing machine main body 1 is provided with a cloth feed arm 2 for feeding a sewing workpiece. This cloth feed arm 2 is a feed cam 10 for generating a feed pattern built in the sewing machine main body 1.
(FIG. 2) and a feed pattern switching device 9 for switching the feed pattern generated from the cam 10, and can feed cloth in the X and Y directions according to the feed pattern transmitted via a link device or the like. At the front end of the cloth feed arm 2, two mounting grooves 2a formed in parallel are formed. The mounting portion 3a, which is the upper end portion of the work clamp body 3, is fitted in the mounting groove 2a so as to be vertically movable. Work clamp body 3
On the lower surface of the lower end portion 3b (Fig. 5) of the above, there is provided a cloth pressing piece 4 which is rotatable with respect to the lower surface in a horizontal plane.

The cloth pressing device R composed of the cloth pressing body 3 and the cloth pressing piece 4 will be described later in detail with reference to FIGS. 3, 4, and 5.

A needle bar 5 which is reciprocally moved in the vertical direction by an upper shaft is provided at the front end of the sewing machine main body 1. The needle bar 5 is provided with the cloth pressing piece 4 described above.
It penetrates through the needle hole 4a formed in and moves up and down.

The feed pattern switching knob 6 (Fig. 1) is provided at a lower portion of the sewing machine body 1, and the feed pattern switching device 9 (Fig. 2) is provided.
This is an operation member for switching the feed pattern in the XY directions. A pair of flexible wires 7 and 8 are connected to the feed pattern switching knob 6. The other ends of the flexible wires 7 and 8 are fixed to the cloth pressing piece 4, and the cloth pressing piece 4 can be rotated in the horizontal direction by rotating the feed pattern switching knob 6.

First, referring to FIG. 2, the structure of the feed pattern switching device 9 will be described.

Below the feed pattern switching device 9, there is provided a feed cam 10 which is decelerated from the upper shaft of the sewing machine body 1 and driven to rotate in the horizontal direction. This feed cam 10 is formed in a disc shape,
A cam groove 10a for generating a feed pattern in the X direction is engraved on the upper surface thereof. On the other hand, the lower surface of the feed cam 10 has a cam groove 10b for generating a Y-direction feed pattern.
(Not shown) is engraved. Cam rollers 11a and 12a (not shown) projecting from the tips of the cam followers 11 and 12 are fitted in the cam grooves 10a and 10b on the upper and lower surfaces. The cam followers 11 and 12 have shafts 1 whose boss portions 11b and 12b (not shown) are erected near the feed cam 10.
The cam follower 11 is loosely fitted in the cam follower 3, and the cam follower 12 is arranged on the same axis 13 below. Therefore, the cam follower 11 swings around the shaft 13 when the cam roller 11a moves along the cam groove 10a. Similarly, the lower cam follower 12 also has a cam groove 10b.
It swings according to the groove pattern. The swing motion of the cam follower 11 is transmitted to the cloth feed arm 2 as a motion in the X direction via a link mechanism (not shown). On the other hand, the swing motion of the cam follower 12 is transmitted to the cloth feed arm 2 as a motion in the Y direction via a link mechanism (not shown).

Between the boss portion 11b of the cam follower 11 of the shaft 13 and the boss portion 12b of the cam follower 12, the pattern switching clutch 14 installed on the shaft 13 has a pawl 14a above and a pawl 1 below.
Has 4b. Meanwhile, the boss part 11b of the cam follower 11
A trapezoidal vertical groove 11c into which the claw 14a is fitted is formed in the. Similarly, a vertical groove 12c (not shown) that fits into the claw 14b is formed in a portion above the boss portion 12b of the cam follower 12. Also, the boss portions 11b and 12b of the cam followers 11 and 12
Slit-shaped lateral holes 11d and 12d (not shown) on the side surface of
Are formed.

The pattern switching shaft 15 is erected in parallel with the shaft 13, and each boss portion of a pair of upper switching claw 18 and lower switching claw 19 is fixed in the vertical direction. Further, the collar 16 is fixed above the upper switching claw 18, and the spring is provided above the collar 16.
17 are arranged in contact with each other. Normally this spring 17
Presses the pattern switching shaft 15 downward via the collar 16. The upper switching claw 18 and the lower switching claw 19 are integrally provided with tongue portions 18a and 19a protruding outward, respectively.
Is fitted in the lateral hole 11d of the cam follower 11.
The tongue portion 19a is fitted in the lateral hole 12d of the cam follower 12. Therefore, since the pattern switching shaft 15 is normally biased downward by the biasing force of the spring 17, the upper switching pawl 18
And the lower switching claw 19 are both urged downward, and the tongue portions 18a and 19a
The cam followers 11 and 12 are urged downward via.
Therefore, the claw 14a of the pattern switching clutch 14 is in a fitted state with the vertical groove 11c of the cam follower 11.

The feed pattern switching knob 6 provided at the lower portion of the sewing machine body 1 is fixed to the tip of the horizontal shaft 20, and the switching cam 23 is fixed to the other end of the horizontal shaft 20. Inside the switching cam 23, a sleeve 22 is coaxially provided with a fixing screw 21.
It is fixed to the horizontal axis 20 through. 3 for this sleeve 22
A single flange portion 22a is integrally formed, and a wire groove 22b is formed between the flange portions 22a. Wire ends 7b and 8b of a pair of flexible wires 7 and 8 fixed to the sewing machine body 1 via fixing portions 7a and 8a are connected to the wire groove 22b in a wound manner. Therefore, the feed pattern switching knob 6
When is rotated 180 ° in the counterclockwise direction, the wire end 7b of the flexible wire is pulled and the wire end 8b of the flexible wire 8 is loosened accordingly by the rotation. At the same time, the switching cam 23 provided at the tip of the horizontal shaft 20 rotates 180 °, and the pin 16a projecting from the side surface of the collar 16 that is in contact with the switching cam 23 moves upward as the switching cam 23 rotates. Can be lifted to. When the collar 16 is lifted upward, both the upper switching claw 18 and the lower switching claw 19 move upward together with the pattern switching shaft 15.
Accompanying this, the cam followers 11 and 1 via the tongues 18a and 19a.
2 is lifted up. When the cam followers 11 and 12 are lifted upward, the engagement between the cam follower 11 and the pattern switching clutch 14 is released, and conversely, the pawl 14b of the pattern switching clutch is provided with the vertical groove 1 of the lower cam follower 12.
It is fitted to 2c. As a result, the link mechanism of the cam followers 11 and 12 is switched, and the feed pattern in the XY direction is reversed and the feed pattern is transmitted to the cloth feed arm 2.

Next, the cloth pressing device will be described with reference to FIGS. 3, 4, and 5.

The cloth pressing device R is composed of a cloth pressing body 3 attached to the tip of the cloth feeding arm 2 so as to be vertically movable, and a cloth pressing piece 4 rotatably held on the lower surface thereof. The cloth pressing body 3 is composed of a pair of left and right cloth pressing main bodies 3A and 3B. Each mounting portion 3a at the upper end of the cloth pressing body 3 is fitted to the mounting groove 2a of the cloth feeding arm 2 by a spring (not shown). It is urged downward. The lower end portion 3b located below is integrally formed with the mounting portion 3a, and each lower end portion 3b is formed in an arc. Race grooves 3c are formed in a circular arc on the lower surface of the outer peripheral portions of the left and right cloth pressing main bodies 3A, 3B.

The cloth pressing piece 4 is divided into left and right cloth pressing portions 4A and 4B at a central portion, and needle holes 4a and 4b are formed in one direction at the central portion. The needle holes 4a, 4b are at the matching positions facing each other, and the center line of the needle holes 4a, 4b is positioned in the direction perpendicular to the longitudinal direction of the sewing machine main body in the lateral bar tacking sewing. The race groove 3c is provided on the outer peripheral portion of each of the presser foot portions 4A and 4B.
Convex portions 4Ac and 4Bc that fit with are integrally formed.
Therefore, the pair of presser foot portions 4A, 4B are the pair of presser foot bodies 3A, 3B.
The convex portions 4Ac and 4Bc are fitted on the lower surface of the race groove 3c, and can be horizontally rotated along the race groove 3c.

In addition, the outer peripheral portions of the cloth pressing portions 4A and 4B are the cloth pressing main bodies 3A and 3B.
A holding plate 29 fixed to the outer periphery of the lower surface of the holding plate with screws 30a and 30b.
It is held in a and 29b.

Elastic members 24a and 24b formed of a spring material or the like are connected to the cloth pressing portions 4A and 4B. Each elastic member
24a and 24b are provided with a pair of cloth pressing portions 4A and 4A through screws 25 and 26.
4B is to be connected, and due to its elasticity, each presser foot 4
A and 4B can move up and down freely and independently.
A connecting pin 27 protruding upward is provided at an extended end of the elastic member 24a, and a connecting pin 28 outwardly protruding at an extending end of the elastic member 24b in the opposite direction. This connecting pin
The wire end 8a of the flexible wire 8 is fixed to 27. The wire end 7a of the flexible wire 7 is connected to the connecting pin 28.

The side bar tacking sewing is performed in the state shown in FIG. 3, but when the feed pattern switching knob 6 is manually switched, the wire end of the flexible wire 7 is sewn.
Since 7b is pulled along the wire groove 22b, the wire end 7a at the other end is pulled, and the elastic member 24b is pulled counterclockwise via the connecting pin 28 connected to the wire end 7a. Therefore, the work clamp piece 4 rotates counterclockwise,
It stops in the state shown in FIG. That is, in this state, the needle holes 4a, 4b are rotated by 90 °, and the needle holes 4a, 4b are set to the vertical bartacking sewing state. On the contrary, when the feed pattern switching knob 6 is rotated clockwise, the wire end 8b of the flexible wire 8 is pulled, and the wire end 8a of the other end is pulled accordingly, so that the cloth is woven through the connecting pin 27. The presser piece 4 is rotated clockwise,
The state shown in FIG. 3 is set to the state shown in FIG. 3, that is, the vertical bar tacking sewing is changed to the horizontal bar tacking sewing.

As described above, in the cloth pressing device of this embodiment, the cloth pressing body 4 is also formed of a pair of members that vertically move independently, and the cloth pressing piece 4 is rotatably held by the cloth pressing body 3. Since the elastic members 24a and 24b are connected to each other so as to be vertically movable, even when the cloth pressing device R presses a cloth having a step, each cloth pressing body 3 and the cloth pressing piece 4 have their own cloth. Since the stepped portion of is clamped, the clamping force becomes stable. Moreover, since the elastic members 24a and 24b connecting the cloth pressing portions 4A and 4B are connected with the ends of the wires 7 and 8 which are interlocked with the switching operation of the feed pattern switching knob 6 of the feed pattern switching device 9, The work clamp foot 4 can be rotated by 90 ° in conjunction with the changeover of the pattern changeover knob 6, and if the feed pattern changeover device 9 is in the side bar tack sewing state, the work clamp device R is also set in the side bar tack sewing state. When the feed pattern switching device 9 is set to the vertical bar tacking sewing state, the work clamp device R can be set to the vertical bar tacking sewing state via the wires 7 and 8, and the feeding pattern is simply changed. The work clamp device R can also be switched at the same time by the switching operation of the switching knob 6, and it is not necessary to replace the work clamp piece 4 for horizontal bartacking and vertical bartacking, and one-touch switching can be performed. Remarkably improved .

[Effects peculiar to the present invention] The present invention relates to a feed cam for generating a feed pattern for a cloth feed arm, and a feed pattern switching device capable of changing a lateral bartack stitch to a vertical bartack stitch without exchanging the feed cam. In a cycle sewing machine including: a cloth presser main body that is vertically held by the cloth feed arm; and a presser foot that is rotatably held by a lower surface of the cloth presser main body and has a unidirectional needle hole in the center. And when the feed pattern switching device is switched to either horizontal bartacking or vertical bartacking, the cloth pressing piece is rotated to correspond to the needle hole of the cloth pressing piece. By providing a switching connecting member for connecting the cloth pressing piece and the operating member of the feed pattern switching device so that the bartacking stitch is sewn at any position of the lateral bartacking stitch and the vertical bartacking stitch, the lateral bartacking stitch is provided. Vertical bar-tacking Switching the feed pattern to turn By switching the operating member, the work clamp foot rotates via the switching connecting member, and the needle bar for horizontal bar tacking can be switched to the needle bar for vertical bar tacking, so the feed pattern can be switched. At the same time, the cloth presser can be switched at the same time.

[Brief description of drawings]

1 shows an embodiment of the present invention, FIG. 1 is an external perspective view of a cycle sewing machine, FIG. 2 is an explanatory view of a feed pattern switching device, and FIGS. 3 and 4 are plan views of a cloth pressing device. 3 is a state diagram set in a lateral bartacking stitching state, FIG. 4 is a state diagram set in a vertical bartacking stitching state, and FIG. 5 is a sectional view taken along the line AA in FIG. 1 …… Sewing machine main body, 2 …… Cloth feed arm 3 …… Cloth pressing body, 3c …… Lace groove 4 …… Cloth pressing piece, 4a, 4b …… Needle hole 6 …… Feed pattern switching knob 7,8 …… Flexible wire 9 …… Feed pattern switching device 10 …… Feed cam 14 …… Pattern switching clutch 23 …… Switching cam 24a, 24b …… Elastic member 27,28 …… Coupling pin, R …… Cloth pressing device

Claims (2)

[Claims] 1. A feed cam or an electronic control unit for generating a plurality of feed patterns for a cloth feed arm, and a feed pattern switching device capable of changing a lateral bartacking stitch of the cloth feed arm from a vertical bartacking stitch. In a cycle sewing machine provided with the cloth feed arm, a cloth presser main body held so as to be vertically movable,
A cloth pressing piece which is rotatably held by the cloth pressing body and has a unidirectional needle hole at the center, and the feed pattern switching device switches between horizontal bar tacking and vertical bar tacking sewing. And the feed pattern such that the needle pressing hole of the cloth pressing piece is set at either the corresponding position of the lateral bartacking stitch or the vertical bartacking stitch when it is twisted. A cloth pressing device for a cycle sewing machine, comprising a switching connecting member for connecting an operating member of the switching device. 2. The cloth pressing body has a pair of left and right cloth having a mounting groove at the upper end thereof that fits vertically into the mounting groove of the cloth feeding arm, and a race groove provided at the cloth pressing surface at the lower end. The presser foot is fitted in the race grooves of the left and right cloth presser main bodies, is rotatably held in the cloth presser body in the horizontal plane about the central needle hole, and is divided into a pair of left and right parts in the central part. The switching connecting member includes a pressing portion and an elastic member that connects the left and right pressing portions so as to be vertically movable independently of each other. The switching connecting member has one end fixed to an extended end of the elastic member and the other end of the feeding pattern switching device. A wire which is connected to the switching knob and is hung so as to rotate the cloth pressing piece to a predetermined position with respect to the cloth pressing body via the elastic member in association with the rotation operation of the switching knob. Cycle sewing machine presser device according to item 1 of the above.