JPS62192194A - Differential feed mechanism of sewing machine - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed description of the invention]

[Technical Field of the Invention] The present invention relates to a cloth feeding mechanism for a sewing machine, and more particularly to a differential feeding mechanism consisting of a main feed and a sub-feed. [Technical background of the invention and its problems] Generally, in order to shrink or stretch fabric, a differential feed mechanism is used in which the amount of fabric feed is different before and after the needle. Conventionally, in such a differential feed mechanism, a main feed dog and a sub feed dog are provided, and these are separated by separate cams,
It was operated by a cloth feeding mechanism consisting of links and overlays. However, in devices such as this in which the main feed dog and the sub feed dog are operated by separate mechanisms, the phase (feed timing) of both feed dogs must match, so the i*
In addition, the equipment becomes larger and the number of parts increases, making it expensive. [Object of the Invention] The present invention has been made in view of such conventional difficulties.
It is an object of the present invention to provide a differential feed mechanism for a sewing machine in which there is no phase shift between both feed teeth and the number of parts is reduced. [Summary of the Invention] In order to achieve the above object, in the differential feed mechanism of the present invention, a similar sub-feed mechanism is not provided separately from the main feed mechanism, but a part of the sub-feed table is connected to the main feed mechanism. Directly connected to the feed base to perform vertical movements in unison, and for horizontal swinging movement, the swinging part of the sub-feed base is connected to the horizontal feed arm of the main feed mechanism via a link, The swing width is variable. More specifically, the differential feed mechanism of the present invention includes a vertical feed cam and a horizontal feed cam that rotate together with the drive shaft, a vertical feed rod that is fitted to the vertical feed cam, and a vertical feed rod that is fitted to the horizontal feed cam. a horizontal feed arm that is connected to the horizontal feed rod and swings; one end is connected to the vertical feed rod and the other end is connected to the swing arm of the horizontal feed arm; a main feed mechanism section consisting of a feed base that moves in an elliptical manner and a main feed dog fixed to the feed base, one end of which is connected to a part of the horizontal feed arm, and the other end of which forms a variable swing point; a first link; second and third links connected to the variable swing point of the first link; and a differential link connected to one end of the second link and adjusting the variable swing point. The present invention is characterized in that it is composed of a lever and a sub-feeding mechanism section that is connected to the third lever and has a sub-feeding tooth with one end pivotally connected to the feed base. [Embodiments of the Invention] Preferred embodiments of the present invention will be described below with reference to the drawings. FIG. 1 shows the entire sewing machine equipped with a differential feed mechanism according to the present invention. A feed adjustment mechanism 3 is fixed to one end of l2. The feed adjuster end 3 has a vertical feed cam 4 as shown in FIG. Feed adjustment table 5 (in this example,
The vertical feed cam 4 and the feed adjustment table 5 are integrally molded.)
5. It consists of a horizontal feed cam 6 and a feed adjustment plate 7 which are slidably engaged with the feed adjustment table 5, and these are elastically attached to the drive shaft 2 with screws 9 through wave washers 8. A vertical feed rod 1o is fitted to the vertical feed cam 4, and a horizontal feed rod it is fitted to the horizontal feed cam 6, respectively. A feed height adjustment bushing 1 is attached to the lower end of the vertical feed rod 10.
2 and set screw 13 to vertically drive part 1 of feed base 14.
4' are connected, and the vertical movement of the vertical feed rod 1° based on the amount of eccentricity of the vertical feed cam 4 with respect to the shaft 2 is controlled by the upper feed table 14.
transmitted to. Fine adjustment of the height of the vertical movement is performed by the feed height adjustment bushing I2. A main feed dog 15 is fixed to the upper feed table 14. Also, the vertical drive section 14 of the upper feed table 14
'A sub-feed table 16 is swingably mounted on a mounting shaft 17 in the vicinity. The upper end of the sub-feed table 16 is the sub-feed dog 18
has been achieved. On the other hand, the horizontal feed rod 11 moves horizontally based on the amount of eccentricity of the horizontal feed cam 6 with respect to ll1l12. Can be adjusted. Namely. The horizontal feed cam 6 has a cam groove that engages with the cam of the feed adjustment plate 7, and the rotation of the feed adjustment plate 7 is controlled by the feed adjustment push button 19.
When the drive shaft 2 is rotated and the horizontal feed cam 6 is rotated in a locked state, the horizontal feed cam 6 is regulated by the cam of the feed adjustment plate 7 and slides in the direction perpendicular to the drive shaft 2! is
do. The push button 19 is normally urged toward the outside of the sewing machine body by a spring 20 and is attached to a side plate so as to prevent it from slipping out. The feed adjustment plate 7 is provided with a scale indicating adjustment. Further, a 4H needle cap 21 is attached to the head of the screw 9 to indicate the scale. One end of the horizontal rod 11 is connected to one end of a horizontal feed arm 23 by a connecting pin 22, and as the horizontal rod 11 reciprocates in the horizontal direction, the horizontal feed arm 23 moves toward the mounting shaft 24.
oscillates around. The other swinging part of the horizontal feed arm 23 consists of two arm parts 25.26, between which the horizontal feed drive part 27 of the feed upper table 14 is attached +1i11.
Mounted by 12 g. Further, one arm portion 26 of the horizontal feed arm 23 is a sub-feed 1ψ moving arm 2 extending in a substantially horizontal direction.
9 is formed. At the end of the sub-feed drive arm 29, there is a first
One end of the differential 1it adjustment link 30, which is a link, is screwed by the positive screw 31 by +1:. Difference 'f! h! The other end of the adjustment link 30 is connected by a step screw 32 to a differential amount adjustment connection link 33 that is a second link and a sub-feed drive link 34 that is a third link. The point where these 63 links 30, 33, and 34 are connected is defined as a variable swing point. difference! PIJ amount adjustment connection link 33
is approximately C-shaped, and its lower end is fixed to the differential lever 35 with a step screw 36. The differential lever 35 is fixed to a positioning plate 39 attached to the main body by a step screw 37 and a wave washer 38. The differential lever 35 has a guide hole 40 and a positioning hole 41, and the guide hole 40 has a positioning hole 39.
A positioning pin 42 protruding from the 1 positioning hole 4 engages with the 1 positioning pin 42.
1 engages with the positioning ball 43 of the positioning plate 39. The other end of the sub-feed drive link 34 is connected to the sub-feed drive portion 16' of the sub-feed table 16 by a screw 44. This sub-feed drive section 16' swings with the same swing width as the swing width of one variable swing point. The operation of the feeding mechanism in such a configuration will be explained. When the eccentric direction of the horizontal feed cam 6 is aligned with the horizontal feed rod 1, that is, when the drive shaft 2 rotates counterclockwise in the figure starting from the last retreat point, the horizontal feed rod 11 moves in the direction of arrow B in the figure. This causes the horizontal feed arm 23 to swing counterclockwise. Then, the upper feed table 14 connected to the arm portions 25 and 26 of the horizontal feed arm 23
moves in the direction of arrow F in the figure. Driving! I]l1i11
With 180" rotation of I2, the feed base 14 reaches the rearmost position in the figure. On the other hand, at the start, the eccentric direction of the vertical feed cam 4 is at 90 degrees with the vertical feed rod 10, and the vertical feed rod 10 is rotated at 90 degrees. It is at the midpoint of the two downward movements, and by rotating the drive shaft 2 counterclockwise, it moves upward and reaches the upper limit.
Return to the halfway point. Similarly, the upper feed table 14 also moves in the vertical direction. 29 By a combination of horizontal movement and vertical movement. The main feed l#15 on the feed base 14 is the fourth feed l#15 on the upper side of the throat plate 45.
Draw and move the upper half of the ellipse as shown in the figure, and at this time feed the cloth backwards. Next, when the drive shaft 2 continues to rotate further counterclockwise,
From now on, the horizontal feed rod 11 will move in the direction of arrow F, which will cause the horizontal feed arm 23 to swing clockwise, causing the upper feed table to move.

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4 in the direction of arrow B. On the other hand, the vertical feed rod 10 moves downward from the intermediate point, and after reaching the lower limit returns to the intermediate point again, and the upper feeding table 4 also moves in the vertical direction. As a result, the main feed dog 15 returns to its original position while tracing an orbit in the lower half of an ellipse below the throat plate 45. During this time, since the base of the sub-feed dog 18 is connected to the upper feed base 14, the sub-feed dog 18 performs the same vertical movement as the upper feed base 14. On the other hand, the movement in the horizontal direction is transmitted by the sub-feed drive link 34 connected to the horizontal feed arm 23 via the differential A4 link 30, and performs M movement in the horizontal direction with the same phase as the main feed. Next, in such a configuration, the relationship between the horizontal momentum of the main feed (fT15) and the horizontal momentum of the sub-feed dog 18 will be explained based on FIGS. 5 and 6. When the horizontally feeding rod 11 makes a horizontal reciprocating motion, the horizontally feeding arm 23 swings about the shaft 24. When the axis 24 of this horizontally feeding arm 23 is set at point A, the swinging arm rfJ of the oscillation at the axis 28 (point B) of parts 25 and 26
(Wt) is determined by the distance between points A and B. The feed table 14 whose one end is connected to the shaft 28 (point B) is also connected to the shaft 28 (point B).
It moves horizontally with the same width as the point. On the other hand, the difference is that it is connected to the sub-feed drive arm 29 of the horizontal feed @23 with a screw 31 (0 point)!
! The other end of the lJ amount WllI node link 30, that is, the variable swing point to which the differential adjustment connection link 33 and the sub-feed drive link 34 are both connected, also swings around point A, and its swing rlJ(W2) is determined by the distance between points A and D. By the way, the distance of point D to point A is
By operating the differential lever 35, the differential adjustment link 33 can be moved upward (FIG. 5) or downward (FIG. 6) to change the position. As shown in Fig. 5, when the distance between points A and D is longer than the distance between points A and B, the swing width at point D (W2) is the same as the swing width at point B. (WI) Greater than;
Furthermore, as shown in Fig. 6, when the distance between point A and point D is shorter than the distance between point A and point B, the amount of swing at point D (W2) is the amount of swing at point B ( W, ) becomes smaller. Since the sub-feed table 16 is connected to point D by the sub-feed drive link 34, the sub-feed drive section 16' of the sub-feed table 16
moves horizontally with the same width as point D. By moving the differential amount adjustment connection link 33 and moving the variable swing point upward so that the horizontal momentum of the upper end of the sub-feed table 16 (i.e. sub-feed fi) is larger than the horizontal momentum of the feed plate 14, Stretch stitching becomes possible, and shrink stitching becomes possible by moving the variable swing point downward so that the horizontal movement of the sub-feed dog 18 becomes smaller than the horizontal movement of the upper feed table 14. Next, a method of adjusting the differential amount will be explained. First, in the case of stretching, the differential lever 35 is pushed down and the predetermined positioning hole 41 is engaged with the positioning ball 43 for positioning. When the differential lever 35 is pressed down, the end of the differential lever 35 opposite to the operating side rotates upward, thereby moving the differential amount adjustment connection link 33 upward, and the three links 30, 33. 34
The variable swing point that connects the two moves upward. In the case of shrinkage, when the differential lever 35 is pushed up, the differential seat adjustment connection link 33 moves downward, and the variable swing point moves downward. [Effects of the Invention] As is clear from the above embodiments, in the differential feed mechanism of the present invention, the sub-feed section is connected to the horizontal feed arm of the main feed mechanism via a link, and the amount of swing of the link is variable. Therefore, there is no need for a separate mechanism for sub-feed, and eleven feeds with different horizontal momentums are possible. By setting the base point of the sub-feed in a part of the main feed (feed base), the momentum of the sub-feed only needs to be added or subtracted by a slight amount of + or - to the momentum of the main feed, so it is possible to change the momentum of the sub-feed compared to the conventional sub-feed. The mechanism and mechanical parts can be made smaller without adjusting the feed amount unique to the sub-feed, and the movement of each part can be reduced, thereby providing a durable and economical mechanism. Moreover, since the mechanism for extracting horizontal motion and vertical motion from the drive shaft is common, there is no phase shift and there is no need to adjust the phase during assembly.

[Brief explanation of drawings]

Fig. 1 is an overall view of a sewing machine to which the differential feed mechanism of the present invention is applied, Fig. 2 is an exploded view of the differential feed mechanism and feed adjustment mechanism of the present invention, and Fig. 3 is a perspective view of the main parts of the differential feed mechanism. Figures 4 and 5 are diagrams showing the horizontal feed momentum during stretch stitching and shrinkage stitching, respectively. FIG. 6 is a diagram showing the locus of the feed dog. ■・・・・・・Pulley 2・・・・・・Drive shaft 3・・・・Feed adjustment mechanism 4・・・・Vertical feed cam 5・・・・・・Feed Adjustment base 6...Horizontal feed cam 7...Feed adjustment plate IO...Upper/downward rerod 11...Horizontal feed rod 14...Feed base 15...Main feed dog 16...Sub feed bar 18...Sub feed dog 19...Push button 23...Horizontal feed arm 25.26...・Arm portion 28...Mounting shaft 29...Sub-feed drive arm 30...Differential amount adjustment link 33...Differential amount adjustment connection link 34... Sub-feed drive link 35...Differential lever 39...Positioning plate 45...Throat plate D...Variable swing point agent Patent attorney Moritani -Yuth Figure 1 Figure 3 D, /

Claims (1)

[Claims] 1. A vertical feed cam and a horizontal feed cam that rotate together with the drive shaft, and a vertical feed rod that fits into the vertical feed cam;
a horizontal feed rod that fits into the horizontal feed cam; a horizontal feed arm that is connected to the horizontal feed rod and swings; and one end that is connected to the vertical feed rod and the other end that is a swinging arm of the horizontal feed arm. a main feed mechanism section consisting of a feed table connected to the main feed base for elliptical movement, and a main feed dog fixed to the feed base, and a sub feed section having a sub feed dog connected to a part of the main feed mechanism section. A differential feed mechanism of a sewing machine consisting of. 2. The sub-feed section includes a first link whose one end is connected to a part of the horizontal feed arm and whose other end forms a variable swing point, and a first link which is connected to the variable swing point of the first link. a differential lever connected to one end of the second link to adjust the variable swing point; and a differential lever connected to the third lever and having one end pivotally connected to the feed base. 2. A differential feed mechanism for a sewing machine according to claim 1, further comprising a sub-feed table having a sub-feed dog.