JPH071099Y2 - Sewing machine cloth feed adjusting device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention relates to the structure of a cloth feed adjusting device of a sewing machine.

(Prior Art) As a conventional cloth feed amount adjusting device for a sewing machine, one using a cam mechanism is known. It is a structure that changes the horizontal momentum of the link maintained by the cam etc. by changing the eccentricity of the cam etc. fixed to the drive shaft, and the adjustment method is tightening screws before and after adjusting the mounting position of the cam etc. Each of the operations of loosening and tightening the screw was required and it was complicated.
To solve these operational drawbacks, a double cam is used, and a slide cam is used to loosen the screw and enable one-touch adjustment without screw tightening operation. It required precision parts or a large number of parts.

Further, JP-A-62-17 has been proposed to improve these drawbacks.
The improvement proposed in Japanese Patent No. 0288 is proposed, but according to this, the driving of the sewing machine is stopped for the adjusting operation, and then the pulley is turned by the right hand to rotate the pulley and the locking portion formed on the side surface of the feed adjusting plate. To the opposite position of the tip of the feed adjustment push button,
Then, the horizontal feed amount is adjusted by pushing the feed adjusting push button to rotate the pulley while engaging with the locking portion, and the operation is still complicated, and the adjusting portion is structurally during the driving of the sewing machine. Since the adjusting portion is strongly pressed so that the movement or loosening of the parts does not occur, the operation requires a strong force, and it is necessary to increase the strength of the parts in preparation for this operation force.

(Problems to be Solved by the Invention) The present invention is intended to facilitate the adjusting operation by improving the structure of the cloth feed adjusting device, and particularly to provide a compact and unitized feed adjusting device.

(Means for Solving Problems) The present invention has a vertical feed cam fixed to the shaft end of a drive shaft that is rotatably supported by a sewing machine frame, and is adjacent to the vertical feed cam. Provided with guides, feed adjustment pieces, etc.,
By fixing the operation dial covering these plural members to the feed adjusting plate and rotating the operation dial to adjust the position of the eccentric drive pin provided on the feed adjusting plate with respect to the drive shaft. It is characterized in that the reciprocating swing amount of the feed adjusting piece can be adjusted and the position of the feed adjusting piece is held by an elastic body so that the operation can be lightened.

(Operation) The present invention includes a drive shaft rotatably supported by a machine frame,
A vertical feed cam fixed to the end of the drive shaft, a horizontal feed member interlocked with the rotation of the drive shaft, and a feed motion combined by the horizontal feed member and the vertical feed cam via a connecting link, respectively. In a sewing machine provided with a feed table having feed teeth fixed to a tip end thereof, a drive pin is provided at an eccentric position on a side surface of a block integral with the vertical feed cam, which is supported coaxially with the drive shaft. Feed adjusting plate having an arcuate groove concentric with the drive shaft, a stepped guide screw penetrating the arcuate groove of the feed adjusting plate to prevent axial movement of the feed adjusting plate, and the stepped guide screw An adjustment piece guide having a pair of guide walls which are supported by guide screws and parallel to the side surfaces, and a groove portion which is engaged with the drive pin on one side surface and a shaft portion which protrudes in the axial direction of the drive shaft on the other side surface Of the adjustment frame guide A feed adjusting piece slidably provided between the inner walls, a convex elastic body for elastically pressing and holding the feed adjusting piece on the adjusting piece guide, and a scale on the outer surface surrounding each member. A plate is provided, and it is composed of an operation dial that is fixed to the feed adjusting plate.The cloth feed adjusting device is made into a compact unit, and only the feed adjusting piece is elastically held, so that the strength of the elastic body is reduced. It is characterized in that the structure can be simplified because there is no need to increase the height.

(Example) Next, the Example of this invention is described in detail with reference to drawings.

FIG. 2 is a schematic perspective view of a sewing machine equipped with the present invention, in which a ratchet wheel 3 is fixed to one end of a drive shaft 2 which is rotatably supported by the machine frame 1 of the sewing machine. The belt groove and a belt wheel fixed to the output shaft of the drive motor fixed to the sewing machine frame 1 are connected by a belt (neither is shown).

The drive shaft 2 has a needle bar 32 supported by the sewing machine frame 1.
Drive unit 31 consisting of a cam and a connecting rod for vertically moving the
Further, a driving portion (neither is shown) for moving the needle thread catching means such as a looper which cooperates with the fixed needle 33 to form a stitch is attached to the tip of the needle bar.

A feed adjusting device 4 is attached to one end of the drive shaft 2, and the feed adjusting device is shown in FIGS. 1, 3, and 4.
This will be described in detail with reference to the drawings.

The feed shaft 5 is fixed to the sewing machine frame 1 in parallel with the drive shaft 2, and a feed table link 6 is rotatably fitted on the feed shaft 5. One end of the horizontal feed link 7 is fitted to the shaft portion 8a of the feed adjusting piece 8 which is projected from the end of the feed adjusting device 4, and the other end is rotatable through one end of the feed link 6 and a pin 9. Connected to.

The feed table 10 has a feed dog 11 fixed to the upper end of the tip thereof, and one end of the feed table link 6 is connected to a base end thereof via a feed table pin 12. To the lower end of the feed table 10, the other end of a vertical feed link 15 having one end fitted to a vertical feed cam 14 formed in a part of the feed adjusting device 4 is rotatably connected via a pin 13.

The feed table 10 has a combination of horizontal movement (described later) transmitted by the horizontal feed link 7 and the feed table link 6 and a vertical movement transmitted by the vertical feed link 15 for the combined cloth feeding movement of the feed dog 11. It is configured so that it can be done.

The feed adjusting device 4 has a structure as shown in FIGS. 1 and 4, in which a hole 16a of a feed block 16 having a vertical feed cam 14 formed at the end of the drive shaft 2 is fitted and fixed. A shaft portion 17a provided on one side of the feed adjusting plate 17 is inserted into the hole portion 16a and integrated with a screw.

On the side opposite to the shaft portion 17a of the feed adjusting plate 17, the shaft portion 1
A drive pin 17b is integrally provided at a position of an eccentricity a from the axis of 7a, and a plurality of arc-shaped long grooves 17c centering on the axis of the shaft 17a provided on the one side are formed. ing.

The adjusting frame guide 18 is provided with a guide wall 18c formed by a pair of convex members parallel to the side surface, and the drive pin 17b is provided between the guide walls 18c.
Is formed on the feed block 16 by a shaft portion 21a of a stepped guide screw 21 which is fitted into a hole portion 18b formed at a position outside the guide wall 18c. . The shaft portion 21a of the stepped guide screw 21 penetrates the long groove 17c of the adjusting plate 17, and the hole portion 16b of the feed block 16 is formed.
And is fixed to the feed block 16 with a screw 19.

The flange 21b of the stepped guide screw 21 and the feed block 1
An appropriate clearance is provided between the end face of 6 and the feed adjusting plate 17 so that the feed adjusting plate 17 can rotate.

The feed adjusting piece 8 is formed with two parallel flat surface portions 8b which are slidable in the longitudinal direction of the guide wall 18c of the adjusting piece guide 18 in parallel to the laterally protruding shaft portion 8a. The parallel surface portion 8b on the side opposite to the protruding direction of the shaft portion 8a.
There is formed a vertical groove 8c which is orthogonal to the above and is capable of sliding the drive pin 17b of the feed adjusting plate 17 when the feed adjusting plate 17 is rotated.

The elastic body 20 is formed in a convex shape by a plate-like elastic member, and the shaft portion 8a of the feed adjusting piece 8 is guided by the guide wall 18c of the adjusting piece guide 18 in the convex portion 20b so as to move in the horizontal direction. An opening 20c for permitting is provided, which supports the feed adjusting piece 8 movable in the guide wall 18c of the adjusting piece guide 18 at the rising of the convex portion, and mounts 20a of the elastic body 20. To the threaded portion of the stepped guide screw 21 and attach the nut 2
They are fixed by 2 and 23, and the inner curved surface of the convex portion 20b of the elastic body 20 is brought into contact with the end surface 8d of the feed adjusting piece 8 on the shaft portion 8a side.

One of the nuts 22 fixes one of the mounting portions 20a of the elastic body 20 to the stepped portion 21b of the stepped guide screw 21, and the other nut 23 of the other is the feed adjusting piece 8 and the adjusting piece guide.
This is performed while adjusting the pressing state with respect to 18, and after the appropriate pressing state is obtained, the nut 23 and the stepped guide screw 21 are fixed with an adhesive or the like.

The feed adjusting piece 8 is formed with a protruding shaft portion 8a on one side, and the horizontal feed link 7 is rotatably fitted to the shaft portion and is axially moved by a CS type retaining ring 25 through a washer 24. The position is positioned.

The operation dial 26 is internally provided with a protrusion 26a as shown in FIG. 5, the protrusion is fixed to the feed adjusting plate 17 by a screw 27, and a scale plate 28 is fixed to the end face. Pointer
A base end 29 is fixed to the outer peripheral portion of the feed block 16 with a screw 30, and a front end is arranged at a position indicating the feed amount displayed on the scale plate 28 and indicates a numeral.

The configuration of the present invention is as described above. Next, the operation of the feed adjusting device will be described.

When changing the cloth feed amount, by rotating either the outer periphery of the operation dial 26 or the ratchet wheel 3 fixed to the drive shaft 2 with respect to the other side, the feed block 16 fixed to the drive shaft 2 is formed. On the other hand, a feed adjusting plate fixed to the operation dial 26
Rotate 17.

The drive pin 17b is rotated by the rotation of the feed adjusting plate,
The feed adjusting piece 8 fitted to the drive pin is actuated by the eccentric amount of the drive pin 17b and is guided by the guide wall 18c of the adjusting piece guide 18 to move. As the shaft portion 8a into which the horizontal feed link 6 is fitted moves, the eccentric amount of the shaft portion 8a of the feed adjusting piece 8 with respect to the rotation center of the drive shaft 2 changes.

Therefore, by operating the operation dial 26, the pointer needle 29
If the scale of the scale plate 28 is matched with, the eccentric amount corresponding to the feed amount is indicated.

The guide wall 18c of the adjusting piece guide 18 regulates the sliding direction of the feed adjusting piece 8, and the vertical feed cam portion 14 formed on the feed block 16 so as to obtain a predetermined locus of the feed dog 11. The eccentric phase is set to be constant by the stepped guide screw 21.

(Effect) Since the present invention is configured and operates as described above, the feed amount can be adjusted by a simple operation, and the feed adjusting plate can adjust the axial direction of the elastic body in response to the adjusting operation. Since it is constructed so that it is not affected at all and is kept in a certain state, it supports the elastic body that controls the operation of the feed adjusting piece at two places, and therefore the drive pin may move during driving. Since it does not exist, the eccentricity does not fluctuate, and a large practical effect is obtained without requiring a large force for the adjusting operation.

[Brief description of drawings]

1 is an exploded perspective view showing the structure of a feed adjusting device of the present invention, FIG. 2 is a perspective view showing the structure of a sewing machine, and FIG. 3 is a side view of the feed adjusting device. FIG. 4 is a sectional view of the feed adjusting device, FIG. 5 is a perspective view of an operation dial of the feed adjusting device, 1 is a machine frame, 2 is a drive shaft, 3 is a ratchet wheel, 8 is a feed adjusting piece, Reference numeral 16 is a feed block, 17 is a feed adjusting plate, 18 is an adjusting piece guide, 20 is an elastic body, 21 is a stepped guide screw, and 22 and 23 are nuts.

Claims (1)

[Scope of utility model registration request] 1. A drive shaft rotatably supported by a machine frame, a vertical feed cam fixed to an end of the drive shaft, a horizontal feed motion member interlocked with the rotation of the drive shaft, and the horizontal In a sewing machine including a feed motion member and a feed base that performs a feed movement combined by the upper and lower feed cams via connecting links, the sewing machine is supported on the side of the vertical feed cam coaxially with the drive shaft. A feed adjustment plate 17 provided with a drive pin at an eccentric position on the side surface and having an arcuate groove concentric with the drive shaft, and an axial movement of the feed adjustment plate penetrating the arcuate groove of the feed adjustment plate. Stepped guide screws 21,2
1, an adjustment piece guide 18 supported by the stepped guide screw and having a pair of guide walls parallel to the side surfaces, a groove for engaging the drive pin on one side surface, and a shaft of the drive shaft on the other side surface. A feed adjusting piece 8 provided with a shaft portion projecting in a direction and slidably provided between guide walls of the adjusting piece guide.
And a convex elastic body that elastically presses and holds the feed adjusting piece against the adjusting piece guide, and an operation dial that surrounds each member and has a scale plate on the outer surface and is fixed to the feed adjusting plate. Cloth feed adjusting device for sewing machine consisting of 26 and.