DE2253920A1 - SEWING MACHINE ESPECIALLY FOR SEWING THE MOCCASIN - Google Patents

Description

Patent attorney

Dipl-Ing. H. Lamprecht 8 Munich 5 42

Sewing machine, especially for sewing a cassin edging

The present invention relates to a sewing machine, and more particularly to a moccasin edging sewing machine for Making the seam on the low shoes commonly known as "moccasins".

At the moment the moccasin seam is made by hand, by sewing the upper to the moccasin leaf in such a way that the edge of the upper leather is separated from the edge of the moccasin leaf is included.

The hand-made seam has the disadvantage that the moccasin leaf is not uniform over the whole Seam can be sewn along. Whoever makes the seam has to constantly pull the two to be sewn Exercise shoe parts as well as on the thread. Because of the fatigue that inevitably occurs after a certain period of time however, the worker is then no longer able to obtain a

BATH ORIGINAL

309820/0683

constant and uniform pull on the whole border exercise along.

One has tried ^, the mocass mrand with the well-known Manufacture sewing machines, but on an industrial level has not led to a satisfactory result.

On conventional sewing machines, the stitch gets through the chaining of the upper thread threaded into the needle moving up and down through the object to be sewn obtained with the bobbin thread, eggs contained in a shuttle is that performs a reciprocating motion or a rotary motion, the lower thread through that formed by the upper thread Loop is pulled through. After the two threads have been intertwined, they will be of a corresponding operation, while another device commonly referred to as a gripper is used for the further transport of the item to be sewn by one the amount corresponding to the stitch length.

Conventional sewing machines take a lot of time to make the seam, and besides, it is not easy to to arrange the two parts to be sewn correctly on the machine and to hold them together. Furthermore, it is hardly possible to make a border with a constant height and a uniform one To achieve rounding. For all of these reasons, conventional sewing machines were not used and one is on the manual production of the moccasin seams passed over.

Sewing machines have been built on an industrial scale which work with two parallel needles arranged perpendicular to the upper leather. The ;;, * machines run two parallel Seams do not allow the actual manufacture to be made "Moccas inrandes".

BATH ORIGINAL

309820/0683

The main aim of the present invention is the machine production of the moccasin edge with less expenditure of time than with manual application or production of the moccasin edge required on conventional sewing machines is.

Another object of the present invention is manufacture an even seam so that the seam is the same thickness and height everywhere.

Ultimately, the aim is to create a seam in which the thread tension over the entire length of the seam is equally strong and in which the pieces of leather to be sewn together are evenly tensioned at the points of curvature are.

These and other goals are met by the enjoyment of the invention A sewing machine for moccasin facing sewing, which is to be sewn together with a under the contact surface Leather parts arranged gripper is provided, which executes a rotary and feed movement in the outlet direction of the leather pieces, characterized in that it has a second gripper, the axis of which runs approximately perpendicular to the needle axis and performs an arc-shaped reciprocating movement in a plane which runs perpendicular to the working direction of the needle and which is synchronized with the movement of the first looper is, said second looper cooperating with the first looper by transporting the two to be sewn Parts allows and penetrates between these two parts to die.Höhe and thickness of the edge to be produced KU rules.

According to a further characteristic according to the invention the subject of the invention with a performance for the automatic Lifting of the presser foot from the support surface

309820/0683 BAD

equipped during the transport phase of the parts to be sewn, this device being actuated by the needle bar and in synchronism with the reciprocating one Needle movement works.

These and other features will then be described on the basis of a preferred embodiment of the subject matter of the invention with reference to the accompanying drawings. It shows:
Flg. 1 The sewing machine according to the invention with the two

Transport devices for the advance of the parts to be sewn, in a perspective view from below and partly in section.

Fig. 2 The two parts to be sewn in the transport devices, in perspective view.

Fig. 3 A diagram with the schematic representation of the working phases of the two transport devices for the advance of the parts to be sewn.

With reference to Figure 1, (1) denotes a sewing machine, with an electric motor (2) which is supported accordingly on the machine frame.

On the motor shaft of (2) is a belt pulley (44) drawn up, which is kinematically connected to another pulley (6) via a belt (5), which in turn is drawn on a main shaft (7). This main drive shaft ensures the transmission of the drive movement the various sewing machine parts, such as the needle (Θ), the a horizontal back and forth movement and the one Gripper (9) which works almost in the same plane as the needle and which rotates and feeds.

The various gear elements for the transmission the drive movement on the needle (8) and the hook (9)

BATH ORIGINAL

309820/0683

are not explained further since they are designed as in the conventional sewing machine. The gripper (9) is arranged in a tubular hollow body (10), in such a way that it is completely under its movement the tubular element (10) is located as soon as the needle moves down and pierces the leather piece. if the needle moves up again from the piece of leather,

on the other hand, the gripper is adjusted upwards and moves out of the tubular body through a slot. The gripper (9) therefore carries out a transport movement in the direction of the arrow (f). Then he moves up under the tubular Body and finally returns to its starting position in the opposite direction to the arrow (F) Direction and then run back up to its starting position. With (11) a presser foot is referred to, the the piece of leather presses against the side surface of the tubular body (10) during the sewing process. At the beginning of the sewing process can the foot (11) by hand with a lever (12) be raised, which acts on a presser foot tango (13), to which the presser foot is attached.

The presser foot rod (13) has one up from the sewing machine head outstanding extension, one of which is due this rod vertically arranged arm (14) is attached. (15) denotes the needle bar »of the sewing machine.

(4) is the sewing machine frame. In the sewing machine frame all gear elements for the transmission of the movement to a second gripper (16) are arranged on its Function will be discussed in more detail below.

The transmission of the drive movement to the gripper (16) is as follows: The main shaft (7) drives via a gearbox (17) another wool (18), which is stored accordingly on the machine frame (4).

BATH ORIGINAL

309820/0683

With (19) a cam is referred to, which is mounted on the lower end of the shaft (18) and is in engagement with a hinged at (2Oa) to the Grundqestell (4) fork lever (20). The rear lifting loin (20) is fixed at (20b) to the one end of the swing arm (21), wherein a second arm (22) is associated.

The arm (22) engages at one end with a lever (23) which is articulated to the base 11 (4). Lead to another end of the swing arm (21 "stands for (21a) with, which is respectively supported on Grundgestll (4) one end of lever (24) in engagement, dor be to a shaft (25) is fastened.

With (26) hinged to a sleeve [2 ~>) at '26a) arm is designated. The sleeve f 2 7 * is at the end; one of the shaft (25) associated lever (2Θ) attached.

With (29) the body of the gripper (16) is referred to, which has an axially extending slot (29a). A stone (30) is arranged therein, which is rotatably attached to the base frame (40) and serves to support the body (29). The rear end of Köroer (29) is hinged at (50) approximately to the middle of arm (26).

UD with a lever is referred to which is assigned at (32) of the shaft (35). IHe rotatable shaft is supported on the base frame (4) , on which a tie rod (Ji), described in more detail below, is arranged.

With (34) a further lever is designated, which is attached to a shaft (36) . This rotatable shaft is in turn mounted on the base frame (4).

The lever (34) is a stone (37) is articulated, which actuates the one arm end (26).

With (38) is integrally ¹ denotes spring that is associated with a lever (34) and a lever (31) such that the same

309820/0683 bad orig, nal

be held together and the arm (2 6) on its one Clamp the end.

t39) is a. second lever assigned to shaft (35}, which is actuated by a spring (40), which will be described in more detail below.

With reference to the above explanations, the method of operation the machine according to the invention are described. When the lever (12) is brought into the position indicated by (12a) and thereby the presser foot (11) from the tubular body (1O) has lifted off, you press (with. Hi Ifο nines nicl · + shown Pedals) the pull rod (33), which is then moved against the spring action (4O) in the direction of the arrow (100). Since the end of the arm (26) is clamped between the plane (31), which is assigned to the pull rod (33), and the lever (34), the body (29) of the gripper (16) follows the displacement of this pull rod (33), so that the gripper (16) from the gripper (9) is lifted. Now the upper leather (41), which was previously joined together with the leaf (42), is brought into the working position, as shown in picture 2.

Then you bring the lever (12) into the starting position. If you stop to operate the pull rod (33), take care the return spring (40) ensures that the gripper (16) is placed against the gripper (9) again and between the folded Edge portion of the sheet (42) penetrates.

The gripper (16) is used in practice for the regulation the working position of upper leather and leaf.

Now switch on the motor (2). While the needle starts sewing, the hook (9) takes care of it the gripper (16) for the gradual and automatic feed of the upper leather and leaf.

While the gripper (9), as described above, a rotating and

3 09 820/0683

Advancing motion carries the gripper (16) takes place as a result of by the cam 19) and the lever (20) caused by reciprocating Prelibswegung the shaft (25) has a circular arc-shaped reciprocating motion in the direction of arrow (103) and (104) and in Synchronism with the movements of the gripper (9).

Thanks to the gripper (16), the feed is flawless guaranteed by the upper leather and shaft, and in particular on The outer edge of the edge can be used for the curved fan sections be pulled stronger than the inner edge, which has a positive effect on the edge formation.

A stop element attached to the tubular body (10) (45) works in the opposite direction to the hook (16) and ensures a fixed arrangement of the needle with the needle (8) Leathers to be sewn! Ie.

In order to support the advance of the leather pieces to be sewn, the needle bar (15) actuates the arm (14) attached to the end of the bar (13) during the needle return so that the bar is automatically moved in the direction of the arrow (106) . As a result, the presser foot (11) is also lifted off the tubular body (10) and all of this takes place in synchronism with the working phase of the grippers (9) and (16) while the leather parts to be sewn are being advanced.

In the diagram of Fig.J are those of the gripper (9) and from the gripper (16> during a v < 1] en revolution of the main drive shaft (7) executed movements are shown graphically. The working phases of the grippers are with one marked continuous line.

The preceding description of the subject matter of the invention relates only to a preferred embodiment, the However, changes can be made in many respects without thereby overriding the scope of the disclosure. For example,

BATH ORIGINAL 309820/0683

the design and construction of the sewing machine can be changed as required. The grippers (9) and (16) can be replaced by equivalent elements and also work together in other ways. Finally, the drive elements can be replaced by other equivalent machine parts
be replaced, orme thereby exceeding the scope of the invention * ■ ■ ''

Jhwafc «Pi-ing. H. Lampred *

309820/0683

Claims (4)

- ίο - OI & β Munich PATENT CLAIMS 1. Sewing machine, especially for moccasin border sewing, with a arranged under the support surface of the leather parts to be sewn together Gripper (9) which rotates and feeds in the direction of discharge of the leather parts, characterized in that that it has a second gripper (16), the axis of which runs approximately perpendicular to the needle axis (8) and an arcuate back and forth movement in one direction to the work the needle completes a perpendicular plane that is synchronized with the movement of the first gripper (9) is, said second gripper (16) cooperating with the first gripper by transporting the two to be sewn parts allows and between these two Parts penetrates to show you the height and thickness of the product to be made To adjust the edge. 2. Sewing machine according to claim 1, characterized in that a device (14) for the automatic lifting of the Presser foot from the contact surface of the leather parts to be sewn is provided during the advance phase, this device being actuated by the needle bar (15) and works in synchronism with the reciprocating needle movement. 3. Sewing machine according to the preceding claims, characterized in that that mechanical, controlled by the second gripper and manually operable means (26) (33) (31) and (34) are provided during the introduction of the parts to be sewn between the first and the second gripper allow the second gripper to be lifted off the first gripper 4. Sewing machine according to the preceding claims, characterized in that that the second looper penetrates in any direction between the parts to be sewn and any movement for the transport of these parts. 309820/0883 _{D | p |} , BATH ORIGINAL Blank page