JPS60119983A - Timing apparatus 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 (Field of Industrial Application) The present invention relates to a timing device for a take-up mechanism for a needle bar and feed movement of a sewing machine.

BACKGROUND OF THE INVENTION Sewing machines are designed to be able to perform time adjustments in the Is and in the field with the aim of appropriately correlating the movements of the various seam-forming devices. However, it has been recognized that time adjustment in factories is consuming and uneconomical.

Furthermore, the timing device built into the sewing machine reduces manufacturing costs by T.
If R is adjusted and the period after adjustment is long, it is difficult to maintain proper timing of the sewing machine.

(Problems to be Solved by the Invention) The main object of the present invention is that when assembling a sewing machine, the needle bar and data updater are automatically connected to the feed dog without making adjustments such as changing the model. The goal is to be able to synchronize.

An important object of the present invention is to simplify the mechanism for synchronizing the needle bar and take-up of a sewing machine with the feed dogs.

Still another object of the present invention is to eliminate the need for adjusting the synchronization of the feed dog and the sewing machine needle and take-up after assembly.

Other objects and advantages of the present invention will become apparent from the embodiments described below with reference to the accompanying drawings.

(Means for Solving the Problems) A horizontal upper shaft of a sewing machine is provided with a needle bar and a crank for a take-up, and a cam and a gear of a constant width are mounted on the upper shaft. A cam for controlling the forward and backward movement of the feed dog is mounted on the upper shaft so as to define a predetermined angular position with respect to the crank.

The angular position of the gear on the upper shaft positions a timing mark on the gear at a predetermined angular position relative to the crank. Another gear fixed to the vertical shaft and having a timing mark is adapted to mesh with the upper shaft gear to create a meshing relationship defined by the timing marks of these two gears. A lifting cam is mounted on the vertical shaft to define a predetermined angular position relative to the gears thereon. Due to the above relationship, the needle bar J3 and the tape up mechanism are automatically synchronized with the back and forth and vertical movement of the sewing machine feed dog.

(Example) As shown in FIG. 1 by the dotted line J: at a3, the sewing machine 10 has an overhang 11i! 12. It has a mechanism 14 and a foundation 16. A horizontal upper shaft 18, which can be driven in a manner well known in the sewing machine art, is located in the outrigger arm. The upper shaft 1
8 is a crank 20 fixed to one end of the needle bar 2.
2 and a crank 20 for a take-up member 24, and a synthetic bevel gear 26 and a cam 28 fixed to the other end of the shaft.

The side bar 22 carries a button 30, and one bar carries a crank 20.
, λ0 fixed to the crank by two female screws 34
The shaft 32, the link 36a3 that can be driven on the short axis, and the needle bar collar 38 to which this link is attached are given vertical reciprocating motion.
has a take-up member 24 at one end thereof. The link 40 is pivotally connected to the short shaft 32 at one end;
Further, as shown, it is pivotally connected to one end of a link 44, which is pivotally connected at its opposite end to a fixed axis 46 within the sewing machine. When the upper shaft 18 rotates 1, the link 40 is driven by the crank 2o, and the link 40 whose movement is guided by the link 44 gives the take-up member 24 reciprocating up and down motion.

The cam 28 of the synthetic gear and cam installed at the end of the shaft 18 opposite the crank 20 has a constant width, i.e. it transitions smoothly from one side of the axis of the horizontal shaft 18 to its opposite side. It is formed as a cam with a constant width.

The cam 28 is straddled by teeth 48,50 of a sheet metal feed fork 52, which teeth are flanged as shown to form a large cam-engaging surface. The pin 54 extends from the fork 52 into a sliding block 56 which is captured in the slide of a feed regulator 58 pivotally mounted within the sewing machine 1o. As shown, a feed adjuster lever 60 is pivotally attached to the feed adjuster 58 and is actuated by a feed adjuster control assembly 62 to vary the slope of the feed adjuster 58, thus increasing the slope of the feed adjuster 58 as is known in the art. The progress of the feed can be changed as shown in the figure.

The lower end of the frame 52 is attached to a screw 64 and a nut 66.
The pivot shafts are held at appropriate positions within the frame of the sewing machine 10 by setscrews 76, 78, respectively, so that the pivot shafts 1 to 72. 74
Supported by

Said pivot axis 70 is provided by a lever 52 connected to a sliding block 56 provided in the feed regulator 58. It vibrates in response to F-down motion. The rocking shaft 70 has a pair of upright rocking arms 80.82, which arm springs 84.82.
86 to the mating ends of the U-shaped feed dog gear X7 1788 of the sewing machine. The feed dog carrier A=
A horizontally extending shelf 90 is formed at 88 and the feed dog 92 is attached to this shelf by screws 94.96. The feed dog 92 moves back and forth within the sewing machine bed 98 in response to the vibration of the swing shaft 70.

Bevel gear 26 on horizontal upper shaft 18 engages bevel gear 100 located at one end of vertical shaft 102 . A lifting cam 104 and a toothed pulley 106 are mounted on the opposite end of this shaft 102. As shown in the figure, the cam 104 is connected to the driven member 11.
It has a cam trajectory for accepting zeros. The follower member extends from one end of a lift lever 112 which is pivotally connected to the bed of sewing machine 10 at 114. This lifting lever has a slot as indicated by 118 at the end opposite the driven member 110 and the U-shaped feed dog carrier 88
It is adapted to receive a stud 120 projecting from a downwardly extending portion 122 of the.

Vertical shaft 102, cam 104 and pulley 106 are rotated by upper shaft 18 which operates through meshing bevel gears 26.100. Pivotal movement of the lever 112 is imparted to the lever 112 by a cam 114 actuated through a follower member 110 and when the lever is attached to a stud 120.
By operating the feed dog 92, vertical movement is given to the feed dog 92.

The bell 1-124t on pulley 106 is operatively connected to a weft thread taker (not shown) to rotate the thread thread taker. The pulley is suitably attached to shaft 102 by screws 125 or the like.

The crank 20 is secured to the upper axle 18 by a pin 126, which is force fit into alignment holes 128, 132 formed in the crank and axle, respectively.
figure). The shaft 18 is formed with a longitudinally extending V-shaped groove 134 at the end opposite the crank mounting end, and the shaft has a set screw 136 having a conical light extending into said groove.
A synthetic gear 26 and a cam 28 are attached (FIG. 4). A hole 132 in the circumferential direction in the shaft 18
, and WFr 134 are predetermined to time cam 28, thereby timing cranks 20,1
The forward and backward movement of the feed dog 92 relative to the first rod 22 and the take-up 24 is timed.

Two adjacent gear teeth of gear 26 extend inwardly to form a timing mark 138 at a predetermined angular position of the gear relative to crank 20 in the mounted position of composite gear 26 and cam 28.
．． 140. The gear 100 is secured by a set screw 142 to a numbered flat portion 144 on the upper end portion of the vertical shaft 102, and has a raised I clock mark 146 thereon, which mark can be used during assembly of the machine. The gear 26.100 is positioned between the timing marks 138 and 140 on the gear 26 when the gear 26.100 is first engaged. Cam 104 is attached to a flat portion 150 at the lower end of shaft 102 by a set screw 148. In this case, the contour of the cam is angularly related to the gear 100 in a predetermined manner so as to automatically time the up and down movement of the feed dog relative to the reciprocating movement of the needle bar and take-up and the back and forth movement of the feed dog. It has become.

It should be understood that the above description relates to preferred embodiments of the present invention, and that the present embodiments may be modified in various ways within the scope of the claims.

[Brief explanation of the drawing]

Figure 1 shows the needle bar of the sewing machine according to the present invention, Take-Atsubu J3.
FIG. 2 is a perspective view of the upper shaft of the sewing machine; FIG. 3 is an exploded perspective view showing how one rod and a double crank are attached to one shaft;
FIG. 4 is an exploded perspective view showing how the composite gear and cam are attached to the upper shaft; FIG. 5 is a HIttl perspective view of the vertical shaft included in the operational connection between the upper shaft and the feed dog of the sewing machine; 2
0: Crank, 28: Cam, 52: Feed fork, 58
: Feed adjuster, 70: Swing axis, 88: Feed dog carrier,
102 two vertical shafts, 110: driven member, 112: lifting lever, 134: V-shaped groove, 138.140: timing mark, 144: flat part, 146: timing mark, 150: flat part. Agent Akira AsamuraFig, 1

Claims (7)

[Claims] (1) In a sewing machine, a predetermined angular position is defined with respect to the crank using four rods, a take-up crank attached to the four rods, a feed dog, and a tin that gives back and forth motion to the feed dog. a mechanism having a cam fixed to an upper shaft; a mechanism providing vertical movement to the feed thread and having a gear having a timing mark at a defined position with respect to the crank; a vertical shaft; and another gear. a gear mounted on the vertical shaft, having a timing mark and meshing with the upper shaft gear according to the timing mark on the gear, and a predetermined angle defined with respect to the other gear; J in position
3 and a lifting cam fixed to the vertical shaft. (2) In the sewing machine according to claim 1,
3. The upper shaft has a timing groove, and the gear and the cam on the groove are angularly positioned with respect to the groove. (3) The sewing machine according to claim 2, wherein the gear and the cam on the upper shaft have a composite structure. (4) In the sewing machine according to claim 1,
A sewing machine, wherein the vertical axis is configured to define the angular position of the gear and the cam thereon. (5) In the sewing machine according to claim 4,
A sewing machine in which a flat portion on the vertical axis defines the angular position of the gear and the cam thereon. (6) In the sewing machine according to claim 5,
A sewing machine in which the flat portion is located at opposite ends of the vertical shaft. (7) In the sewing machine according to claim 4,
A sewing machine wherein a set screw extending through the gear and cam on the vertical shaft engages a flat portion on the vertical shaft, thereby mounting the gear and cam on the vertical shaft.