CN1243895A

CN1243895A - Looper drive of sewing machine

Info

Publication number: CN1243895A
Application number: CN 99110717
Authority: CN
Inventors: 嘉数田隆志; 山崎义启
Original assignee: Pegasus Sewing Machine Manufacturing Co Ltd
Current assignee: Pegasus Co Ltd
Priority date: 1998-07-31
Filing date: 1999-07-26
Publication date: 2000-02-09
Also published as: JP2000042277A; TW437765U

Abstract

To simplify the swinging mechanism for a crank, and improve the assembling property for a looper mechanism for a sewing machine, comprising a looper shaft which can rotate and slide in the axial direction, and swings while interlinking with a main spindle, the crank which is axially supported to a fixed shaft being orthogonal to the looper shaft, and swings around the fixed shaft while interlinking with the main spindle, a crank pin which is supported positionally adjustably in the direction being orthogonal to the fixed shaft, to the crank, and a crank pin guide which is fixed to the shaft end of the crank and pinches the crank pin together with the shaft end of the looper shaft, and for which the needle avoiding momentum of a looper can be regulated by a position regulation of the crank pin. A fork part 15a of a crank 15 which is axially supported by a fixed shaft 2, is inserted in a square piece which is fitted on an eccentric cam being fixed to a main spindle 16, and by the main spindle 16, the crank 15 is directly swung, and thus, number of parts are reduced, and also, the assembly is facilitated by making the insertion of the fork part 15a into the square piece 17 possible from an optional direction.

Description

The looper drive of Sewing machines

The present invention relates to be provided with and the looper drive of suture needle co-operating with the Sewing machines of the looper of formation double-chain stitch.

A kind of looper drive of Sewing machines is disclosed in Japanese Utility Model bulletin 1993-10792 communique, as shown in Figures 1 and 2, by constituting: the rotatable curved needle shaft 1 that can slide vertically again and swing linkedly with main shaft with the lower part; Axle is bearing on the fixed axis 2 with curved needle shaft 1 quadrature and the crank 3 that can swing; One end is embedded on the eccentric cam that is fixed on the main shaft outward, other end axle is bearing in the bar 6 on the crank 3; Can be slidably mounted on along direction on the crank 3 and with the fixing carriage 7 of limit screw 5 with fixed axis 2 quadratures; Screw in the carriage 7 and the cam pin 9 chimeric with the regulating tank that on crank 3, forms 8; Axle is bearing in the crank-pin 11 on the fork arm shape support arm 7a that constitutes carriage 7; Be fixed on curved needle shaft 1 shaft end and and the axle head of curved needle shaft 1 between sandwich the crank-pin guide 12 of crank-pin 11, by rotating operation cam pin 9 upper-lower position of carriage 7 is moved, change the axle base of crank-pin 11 and fixed axis 2, short-axis direction with the elliptical orbit looper 13 drawn according to the thickness of suture needle is regulated, that is, can regulate the amount of exercise of dodging pin not changing under the state that hooks up the position of needlework ring.

The present invention improves above-mentioned looper drive, and the swing mechanism of crank is made more simple part, and improves assembling.

That is, the present invention is a kind of looper drive of Sewing machines, by constituting with the lower part: the rotatable curved needle shaft that can slide vertically again and swing linkedly with main shaft; Axle be bearing on the fixed axis with the curved needle shaft quadrature and with main shaft linkedly around the crank of fixed axis swing; Relatively this crank and can with the crank-pin of the direction adjusting position of fixed axis quadrature; Be fixed on above-mentioned curved needle shaft shaft end and and the axle head of curved needle shaft between clamp the crank-pin guide of above-mentioned crank-pin, can regulate the amount of exercise of dodging pin of looper by the position of regulating crank-pin, be characterized in, above-mentioned crank is made tooth fork crank, and the intercalation of tooth fork is being fixed in the eccentric cam on the main shaft or is being fixed on the square cushion block of being installed on the eccentric cam on the main shaft.

Since crank of the present invention directly be fixed in main shaft on eccentric cam or be fixed in the square cushion block of being installed on the eccentric cam on the main shaft and engage afterwards and swing, so compare with looper drive shown in Figure 1, can omit bar 6,, simplify the structure so correspondingly reduced number of spare parts.And crank has the tooth fork, and this tooth fork can not only from the direction of main shaft quadrature, even can from main shaft axially, and can be on eccentric cam or square cushion block, so assemble easily from the arbitrarily angled intercalation of relative main shaft.

Another invention is on the foregoing invention basis, and crank pin is bearing on the carriage, simultaneously carriage is slidably mounted on the crank, and is screwed.

In the present invention, the axle base of crank-pin and fixed axis is regulated by the lax back of screw is changed carriage the installation site of crank is carried out.

Again the feature of an invention be with crank-pin with the state of adjustable position be fixed on crank shape all-in-one-piece support arm on.

The present invention has omitted the carriage in the foregoing invention.

It below is simple declaration to accompanying drawing.

Fig. 1 is the exploded perspective view of traditional looper drive.

Fig. 2 is the side elevation in partial section of this looper drive.

Fig. 3 is the side elevation in partial section of driving mechanism of the present invention.

Fig. 4 is mounted in the stereogram of the another form of carriage on the crank.

Fig. 5 is mounted in the carriage stereogram of a form again on the crank.

Fig. 6 is mounted in the stereogram of other forms of carriage on the crank.

Below in conjunction with description of drawings example of the present invention.

Fig. 3 represents looper drive of the present invention, and the identical part of structure all and shown in Figure 1 is all represented with same-sign among the figure.

Axle is bearing in from fixed axis 2 and stretches out and the crank 15 that forms on the overhanging fulcrum 2a of one has tooth fork 15a, tooth fork 15a intercalation is being fixed on the main shaft 16 and is being omitted on the square cushion block of being installed on the illustrated eccentric cam 17, to swing linkedly with main shaft 16.Like this, by with overhanging fulcrum 2a and aforementioned square cushion block 17 supporting cranks 15, be easy to crank 15 is installed in the Sewing machines.

The carriage 18 that crank-pin 11 is carried out the axle supporting has the axle 19 that protrudes upward, fix among the hole 15b that this 19 intercalation forms on crank 15 and with screw 20, by unclamping the installation site of screw 20 and bracket 18, regulate the axle base between crank-pin 11 and the fixed axis 2.

Fig. 4 represents to be installed in the another example of carriage on the crank, forms pod 27 on crank 26, and the installation portion 28a that stretches out from carriage 28 is slidably mounted in the pod 27, passes the slotted hole 29 of installation portion 28a with limit screw 31 again and fixes.

Fig. 5 installs slide block 35 in the wedge-shaped slot 34 that forms on crank 33, will pass carriage 37 backs from the threaded portion 36 that slide block 35 stretches out and screw on nut 38 at its external part and install.

In above-mentioned example, carriage 28,37 is all identical with carriage 18, is installed on the crank 26,33 with the state of adjustable position.

Fig. 6 forms support arm 42 on crank 41, with passing the threaded portion 45 and the nut 46 that stretch out behind the slotted hole 44 that forms on this support arm 42 crank-pin 47 is installed with the state of adjustable position, when adopting this example, can omit above-mentioned carriage.

Above-mentioned looper drive is curved needle shaft 1 to be come and gone vertically move, so that be fixed on the motion that the looper 13 of looper axle head is dodged pin, and looper 13 to hook up seesawing of needlework ring be by the mechanism that seesaws that is made of bar 23 that is fixed on bar 22 on the curved needle shaft 1, swings linkedly with main shaft and link rod 24 that bar 22 is connected with bar 23 curved needle shaft 1 swing to be carried out.

The invention of technical scheme 1 is directly to make crank do oscillating motion from main shaft, thus can reduce number of spare parts, Simplify the swing mechanism of crank, and the tooth fork of crank can be from any direction intercalation at eccentric cam or square pad On the piece, so easily assembling.

The invention of technical scheme 2 only is relatively crank and regulate the installation site of carriage, technical scheme 3 Invention only be crank-pin can with crank shape all-in-one-piece support arm adjusted installation site owing to need not complexity Governor motion, so simple in structure.

Claims

1. the looper drive of a Sewing machines is by constituting with the lower part: the rotatable curved needle shaft that can slide vertically again and swing linkedly with main shaft; Axle be bearing on the fixed axis with the curved needle shaft quadrature and with main shaft linkedly around the crank of fixed axis swing; Relatively this crank and can with the crank-pin of the direction adjusting position of fixed axis quadrature; Be fixed on described curved needle shaft shaft end and and the axle head of curved needle shaft between clamp the crank-pin guide of described crank-pin, can regulate the amount of exercise of dodging pin of looper by the position of regulating crank-pin, it is characterized in that, described crank is made tooth fork crank, and the intercalation of tooth fork is being fixed in the eccentric cam on the main shaft or is being fixed on the square cushion block of being installed on the eccentric cam on the main shaft.

2. the looper drive of Sewing machines according to claim 1 is characterized in that, crank pin is bearing on the carriage, simultaneously carriage is slidably mounted on the crank, and is screwed.

3. the looper drive of Sewing machines according to claim 1 is characterized in that, with crank-pin with the state of adjustable position be fixed on crank shape all-in-one-piece support arm on.