JPS5825194A - Cloth sending 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] This invention is based on a sewing machine with a G pro cloth feed @ mechanism, and a converter that enables the feed dog to change the cloth feed direction and its mvi, and the amount of conversion as a function of displacement. A feed adjustment dial that stops and adjusts the cloth feed direction, a power operating body that changes the cloth feed direction, and a hand! LII&J provides a feed conversion lever and ' for converting to the cloth feed direction, and when converting the conversion amount to the other cloth feed direction by the action of the power operating body Q, the feed conversion lever is not displaced, and By operating the feed conversion lever, the feed teeth are shifted to a state where the feed teeth are fed by 10,000 cloth and embroidery is reduced by 2. This is related to the cloth feeding mechanism.

Conventionally, in order to keep the length C left between the end of the sewing edge stitch and the edge of the processed fabric (e.g., avoidance sewing length [A-B÷C as shown in the figure)] within a desired range, the feed was adjusted near the edge of the sewing end. Send by dial etc. D
ll, and then turn the upper shaft one turn by hand or by stepping on the foot pedal τ to set the final needle position.
Tsumugi stitching (S) was done. However, this process was extremely troublesome and required 50 seconds of time and trouble.

In the present invention, a single operation of the feed rl/#x lever allows stable ii+recording! ! It is measured so that the manufacturing length is γ.

Hereinafter, embodiments of the present invention will be explained based on the attached drawings.
Fru.

Fig. 2 has a thick δ, 1 is the sewing machine head, 2 is the upper shaft, 8 is the eccentric cam set on the upper shaft 2, 4 is the upper part of the eccentric cam 8, and the play height nl is the horizontal feed rod. be. 5G] With the feeder, a single shaft is provided on the shaft 6 on the lower surface of the bed, and G shafts 7 are provided on the left and right sides of the shaft 6 in the nIj direction (the left side is not shown).

Therefore, each of the shafts 7 marked M'l has a shaft 9 which is loosely fitted on the front side of the feed rl link 8, 8', and the rear side is a shaft 9 which is inclined inwardly. niyut&erlru.

The marking shaft 9 has four horizontal drive rods 10 and 10' inwardly from the feed link 8.8', respectively, or the central i Mi
There is a free play 1fFγL at the bottom of the horizontal horizontal feed rod 401 in J, and the horizontal feed arm 11 connected to the cloth feed dog is arranged between the first blade part of the horizontal drive rods 10 and 10'.
, both □□□ are operatively connected on a shaft not shown.

12 is a feed adjustment cam. Engagement arm 12a, cam surface 11b
, 12c and 12c are formed in place and a reverse stitched fork 18 is connected to the camshaft 14 at one end of the shaft support. 15
is the feed adjustment dial, and the shaft head 15a or the feed adjustment cam 12 move forward and backward in opposite directions to adjust the feed wave or adjustment pi.
This is a well-known fact.

16 is the feed adjustment rod, and σ1 is the feed adjustment rod 1.
Ij for 2! II crotch 2n axis 17, and below it is fI
ff Feed adjuster σ-Right side 1 shaft 7 with cocoon fitting n 18
is a feed converting arm, which has a feed converting arm shaft 19 slightly opposite to the engagement arm 1'2a of the feed m movement cam 12 when the maximum positive feed is set, and is pivotally supported by the rear arm; One turn of the lever shaft 20 (connection ξ11 is urged clockwise by the spring 21 γL 〇22 & Go handle is extended to the outside of the arm, the feed conversion lever is moved to its base & l f4i + lever l1ll)
II20σ9 There is a surface layer il 4:y on the other end.

26 is a stopper for the feed conversion lever 22.

24 is a reverse stitching drive plate, and the bin 25 at the tip is 1! I!
The sewing forearm 18 is applied, and is biased clockwise by a spring 26, and 27 is an electromagnetic solenoid.

28G, its pointer part 28a is a switch mounting plate whose position can be changed up and down, and the switch 29° lever stopper 3
0. Bufunja 81' is a correction feed scale that cooperates with the assembly structure 32 and the above-mentioned pointer Z8&.

In addition, in order to satisfy the present invention σ) cloth feeding operation voltage, a separate σJ electric circuit is installed in series in the apparatus as shown in FIG.
The figure shows the time chart.

The cloth feeding mechanism of the present invention is as described above, and then:
I will discuss its effects.

In the σ1 state shown in the second diagram, the cam surface 1zb of the feed 111-node cam 12 and the feed adjustment dial]5 come into contact with sweat due to the acting force of the sputter 26, and the feed [+'yWk 5
The axis of 7 million σ1 is maintained at a constant level of 1lk. When the sewing machine is operated in this state M (*magnet not acting), the horizontal feed rod 4 moves up and down under the action of the eccentric cam 8, and the horizontal drive rod 10. Activation of the horizontal feed arm 11 via IO';
The fabric 2 is fed in the forward direction for cooperation with the upper F feeding mechanism (not shown). From this state, when the electromagnet is turned on, the cloth is fed in the opposite direction.

That is, when the reverse stitch drive plate 24 is moved in the counterclockwise direction fr, the reverse stitch bifurcation 18. The lower support shaft 7 of the feed adjustment rod 16 is maintained at a constant downward Q+ position via the feed mN+ cam 12, and the MV15& of the n1 feed adjustment dial 15 is brought into contact with the cam surface 12c side of the feed m1t5j cam L-F-.

This means that horizontal feed rod 4σ - tI4 of horizontal drive rods 10, 10' and horizontal feed Nll for vertical movement
The cloth is fed in the opposite direction compared to when the cloth is fed in the opposite direction. What is the choice of this forward and reverse direction? ! When the machine is in the normal feeding state shown in the second figure, which can be performed by turning the magnet ON and OFF'F, and the sewing reaches the avoidance sewing position Fj+10,000 where the stitches should remain on the workpiece cloth, the needle movement + is stopped and the feed conversion lever 22 When the lever stopper 80 is held down until it stops, the feed adjustment cam 12 is moved clockwise and the feed rate decreases. It depends on whether chair 1 of the correction feed scale 82 is selected using the pointer 28a of the reduction bH switch mounting plate 28. In this state and when the switch 29 is turned on, the upper shaft rotates at least once during the operation of the electricity 1g+ path shown in Figures 8 to 4. Therefore, the reduction selected by one operation of this feed conversion lever - or at least one stitch of G
Since it can be sewn repeatedly, it is important to leave a desired stable avoidance stitch length on the fabric to be processed.

As described above, with the cloth feed all structure of the present invention, the feed can be converted to a corrected feed with one operation of the feed conversion lever, and at the same time, the sewing machine can be rotated at least once by using a micro switch, etc. Since it is possible to correct variations in the length of the gutter, it is possible to eliminate troublesome work and time loss, and to achieve a reasonably good sewing effect.

[Brief explanation of the drawing]

Fig. 1 is a diagram showing the state of avoidance sewing of the work cloth σ, Fig. 2 is an explanation of the fabric feed mechanism of the present invention incorporated into the sewing machine head, and No. 8
FIG. 8 is a block diagram of the XJ & Co. air circuit, and a time chart of FIG. 4 and FIG. 8. 2...Upper shaft, 4...Horizontal feed rod, 5...Feed adjuster, 8...Feed link, 10...Horizontal drive rod, 11...Horizontal feed arm, 12... feed adjustment cam,
15... Feed-section dial, 14... Feed conversion arm shaft, 16... ・Feed adjustment rod, 18... ・Feed conversion rod, 22... Feed conversion lever, 24... Reverse i drive Plate, 27...electromagnetic solenoid, 29...switch.

Claims (1)

[Claims] A transducer that is connected to the cloth feed dog and has an engagement arm that changes the direction of its horizontal movement forward and backward, and is always biased in the −° direction by an elastic force in the −° direction and has an engaging arm. , always G
A feed converting lever comprising a feed converting bracelet 2 which is held in a fixed position by an elastic force in one direction and facing the engaging arm, and a converter is moved in the other cloth feed direction C against the elastic force. In conjunction with the power operating body to be converted, the engaging arm and the feed converting arm axis are always kept in the 10,000 cloth feed direction as a distal engagement between the engaging arm and the feed converting arm axis, and the converter is controlled by the action of the power operating body σ. On the other hand, the cloth feed direction &: When the conversion is completed, change the feed and t<-? I: A sewing machine which is connected to the f position a, and by operating the feed conversion lever, the converter is simultaneously displaced in a state where one of the cloth feed teeth is decreased in the cloth feed direction jst, and at the same time the sewing machine is rotated at least once. Cloth feeding mechanism.