DE1049677B - Seam guiding device for sewing machines - Google Patents

Description

The invention relates to a seam guide device for sewing machines for the production of one Reference line parallel seams.

Such devices are already known. So it was suggested to have a console on the push bar to attach, which receives a sliding and lockable Ouerstange, at one end a guide rail is pivotably mounted on the rod and rests with its own weight on the workpiece. This device is not suitable for processing thick workpieces because of its own weight the guide rail alone does not guarantee that it is properly pressed against the workpiece.

In a further known device, this disadvantage is caused by a resilient guide rail, which is on The end of a slidable round cross bar can be pivoted in a console attached to the push bar is appropriate, avoided. To use this to sew a parallel seam to an already existing one, it is required ^ the guardrail after loosening a clamping screw in the console with its crossbar below Apply a measuring stick until the desired distance between the existing ones is reached Suture and the needle to move.

Another known fabric guide device also has a pivotable on the presser bar attached crossbar on which the guardrail is arranged to be displaceable and lockable. A spring-loaded ring is attached to the rod, which acts as a locking device to hold the guardrail is used in a rest position pivoted by 90 °. This device must be used for sewing parallel Seams at different distances from each other also before moving the guardrail the rod a locking screw can be loosened, in turn the desired distance between the The reference line and the seam can be determined by measuring or marking the workpiece beforehand got to.

The known devices are awkward to use when it comes to For example, to produce two seams parallel to their edges on a plurality of identical workpieces, wherein the distances between the workpiece edge and the first and second seam are different. to For this purpose, one must be provided for each seam to be produced before and after the guide rail has been moved The clamping screw must be loosened or tightened again, and the various distances between the seams and the workpiece edge either by measuring or by previous marking the workpiece.

The object of the invention is to provide a seam guide device for sewing machines for the seam guide device
for sewing machines

Applicant:

Dürkoppwerke Aktiengesellschaft,
Bielefeld

Karl Nicolay, Bielefeld,
has been named as the inventor

Production of seams parallel to a reference line to create, also with a holder attached to the push rod and a horizontal Rod for a slidable and pivotable arranged on this, under the action of a Spring is provided on the workpiece or on the guide rail pressed against the fabric support plate, but the Loosening and tightening of locking screws or the like.

before or after moving the guardrail and measuring the distances from a reference line or it is unnecessary to mark them on the workpiece when producing a plurality of identical workpieces power.

This object is achieved according to the invention essentially in that the guardrail between two adjustable and lockable stops taken up by the rod in a swiveled-up position Position can be moved into any position, limited by the stops, and after pivoting down by an automatic clamping device in the set working position Moving is locked.

To lock the guardrail in its swiveled up position and to generate the contact pressure in its working position a spring connected to the guardrail is provided, the notches to interact with one fastened in the outer stop, slidable in the inner stop and in the holder having guided locking rod.

The automatic clamping device for locking the guardrail in its working position can consist of a clamping spring that tightly encloses the rod, the free ends of which are attached to the locking

809 747/169

Claims (3)

animal bar supported, while the bracket of the spring rests on the rear edge of the guardrail without tension. The invention is shown in the drawing in one embodiment, for example. 1 shows the seam guiding device attached to the push rod of a sewing machine in its working position in a diagrammatic representation, FIG. 2 shows the device in its rest position, also in a diagrammatic view, and FIG. 3 shows a section through the guide rail along the line III- III of FIG. 1. In the drawing, 1 denotes the head, 2 denotes the presser bar and 3 denotes the needle bar of a sewing machine. A holder 4 is fastened to the presser rod 2 by means of a screw 5. The holder 4 is provided with a horizontally arranged circular cylindrical rod 6 on which a guide rail 9 is received between two displaceable stops 7, 8. A rod 10 is inserted into the stop 8, the free end of which is passed through an opening 11 in the stop 7 and an opening 12 in the holder 4. The stops 7, 8 have slots 13 which are used to clamp the stops 7, 8 on the rod 6 by means of clamping screws 14. The guardrail 9 (FIG. 2) is designed with U-shaped offset tabs 15 which are provided with bores in order to pivot the guardrail 9 on the rod 6. Between the tabs 15 there is a clamping spring 17 which surrounds the rod 6 and is designed with a bracket 16, which is supported with its spring ends 18 on the lower rod 10, while its bracket 16 rests against its rear edge 19 when the guide rail 9 is pivoted up comes (Fig. 3). A loose spacer ring 20 is arranged between the spring sections of the clamping spring 17 (FIG. 2) which are wound in the opposite direction. A leaf spring 21 is screwed onto the guide rail 9 (FIG. 3) and rests resiliently on the rod IQ from below. It is designed with notches 22 and 23, which are used to lock the guardrail 9 with the rod 10 in different positions. The free end 24 of the leaf spring 21 is bent upwards at right angles. Working with the device is as follows: For example, two seams 27, 28, which are at different distances from their edges 26, are to be produced in a number of workpieces 25. For this purpose, the guide rail 9 is pivoted upwards until the catch 23 engages on the lower rod 10 (FIGS. 2 and 3). During the pivoting movement of the guide rail 9, its rear edge 19 has canceled the clamping effect of the clamping spring 17 by resting on its bracket 16. The guide rail 9 can now be easily moved on the rod 6 until it rests against the stop 7, which determines the distance between the first seam 27 and the workpiece edge 26. The guardrail 9 is after its pivoting under the pressure of its leaf spring 21, which now rests resiliently in its notch 22 on the lower rod 10, on the support plate 29 fabric. The rod 6 is firmly enclosed by the spring 17 after the rear edge 19 of the guardrail 9 has released the spring clip 16. As a result, the guide rail 9 is locked on the rod 6 against lateral displacement. To sew the second seam 28, the guide rail 9 is moved after it is pivoted up to the stop 8, which determines the distance from the workpiece edge 26 to the second seam 28, and brought into the locked working position by lowering. As can be seen, the method of operation is very simple and economical, since when processing a number of identical workpieces, the guide rail can only be moved between the stops after lifting without having to loosen or tighten screws, so that it is automatically held in its working position after lowering will. Patent claims: 1. S aht-Füh approximate device for sewing machines for the production of seams parallel to a reference line with a holder attached to the push rod and a horizontal rod for a displaceable and pivotable on this, under the action of a spring on the workpiece or on The guide rail pressed against the fabric support plate, characterized in that the guide rail (9) between two adjustable and fixed separable stops (7, 8) received by the rod (6) in a swiveled up position in any position delimited by the stops (7, 8) is displaceable and is locked after being pivoted down by an automatic clamping device in the set working position against displacement. 2. Seam guiding device according to claim 1, characterized in that for locking the guide rail (9) in its pivoted up position and to generate the contact pressure in its working position one with the guide rail (9) connected spring (21) is provided, the catches (22j 23) for cooperation with an in the outer Attached stop (8), guided displaceably in the inner stop (7) and in the holder (4) Has locking rod (10). 3. Seam guide device according to claim 1 and 2, characterized in that the automatic Clamping device for locking the guardrail (9) in its working position from a the rod (6) tightly enclosing the clamping spring (17), which with its free ends (18) on the locking rod (1.0), while the bracket (16) of the spring (17) on the rear edge (19) of the guardrail (9) is without voltage. 1 sheet of drawings