GB2269828A

GB2269828A - Telescopic and folding sewing machine

Info

Publication number: GB2269828A
Application number: GB9217694A
Authority: GB
Inventors: Scott Derek Thompson-Whiteside
Original assignee: THOMPSON WHITESIDE SCOTT DEREK
Current assignee: THOMPSON WHITESIDE SCOTT DEREK
Priority date: 1992-08-20
Filing date: 1992-08-20
Publication date: 1994-02-23
Also published as: GB9217694D0

Abstract

A sewing machine, eg a locking stitch machine, has the ability to telescope when not in use and fold to form a slim and compact package. With the use of splined telescopic drive shafts (2, 4 and 1, 3), it is possible to telescope the lower and upper arms (11, 12 and 9, 10). The upper arm can be pivoted through 90 DEG about the axis of the lower arm, a collar (5) normally holding the upper arm in position. The machine is driven by a battery-powered motor (7). <IMAGE>

Description

SPECIFICATION Telescopic and folding sewing machine.

This invention relates to conventional locking stitch sewing machines in particular the mechanism for a simple running stitch based from a Wheeler Wilson No.9 machine, circa 1880.

Other compact sewing machines, although slightly smaller than my proposal, do not produce an effective iocking stitch and are based on the chain stitch principle. Therefore the inventor has designed a new type of compact sewing machine that produces a locking, running stitch. Although much smaller and lighter than a conventional machine the invention is designed to telescope and fold when not in use. thus producing a very compact package.

According to this invention, I propose a compact sewing machine comprising of four horizontal, telescopic. splined shafts of which the lower two shafts (outer and inner) are directly driven by bevelled gears from a battery driven motor. A collar around the lower shaft allowing to pivot the main arm ninty degrees, an inner and outer bobbin casing, the outer casing of the main arm and an inner casing of the main arm with needle assembly.

Embodiments of the invention are described by way of example, with reference to the drawings.

Figure 1 is a side view cut away of the rear section showing the splined sections, supporting collar and motor drive.

Figure 2 is a side view cut away of the front section showing needle and bobbin assembly.

Figure 3 Shows the side view of the sewing machine with the bobbin casing and main arm, with needle assembly. telescoped in.

Figure 4 shows the end view of the sewing machine in the same position as in Figure 3.

Figure 5 shows the end view of the sewing machine with the main arm folded down. This is its most compact position.

As shown in Figures 1 and 2, the sewing machine comprises of a battery driven motor (7) which connecting to the bevelled gears (6) drives the lower outer spline (2). With the use of a spline system this in turn drives the lower inner spline (4) which connects to the bobbin assembly (15! The continual rotation of the lower shafts (2 and 4) is used to drive the upper splined shafts (1 and 3) with the correct timing needed, by the timing belt (8) and related pulleys The needle bar (14) is connected to the upper splined shafts with a similar arrangement as used by a basic running stitch machine (16), i.e. the Wheeler Wilson No. 9.

When not in use needle bar (14) and foot (17) are lifted by a small lever (not shown). then the inner casing of the main arm (10) and the inner casing of the bobbin assembly (12) are pushed into the outer casings 9 and 11 respectively. With this operation the inner splined shafts (3 and 4) sllde in the outer shafts 1 and 2 respectively. Figures 3 and 4 show the position of the machine at this stage Once in this position, the main arm (9 and 10) with its enclosed components can rotate about the lower shafts (2 and 4). For secure movement the two casings (9 and 11) are linked by a collar (5) which fits around the lower outer shaft (2). The collar (5) is designed to rotate ninty degrees only The final position can be seen in figure 5.

To prepare the machine ready for use, the steps described above are carried out in the reverse sequence.

Claims

1. A telescopic and folding sewing machine comprising tour horizontal. telescopic.splined shafts of which the lower two shafts (outer and Inner) are directly driven by bevelled gears from a battery driven motor. A collar around the lower shaft allowing to plvot the main arm ninty degrees. an inner and outer bobbin casing. the outer casing of the main arm, an inner casing of the main arm with needle assembly

2. A telescopic and folding sewing machine as claimed in claim 1 wherein the telescopic splined shafts provide movement for of the main arm with needle assembly and for the bobbin assembly.

3. A telescopic and folding sewing machine as claimed in 1 wherein the lower shaft connected to the bobbin assembly Is driven directly by bevelled gears which is in turn driven by the battery powered motor

4. A telescopic and fot!na sewing machine as claimed in 1 wherein a collar around the tower shaft allows the main arm to pivot and lock in two ninty degree positions.

5. A telescopic and folding sewing machine as claimed in 1 wherein the inner and outer casing for the bobbin assembly is able to lock at its outer and innermost telescopic positions.

6. A telescopic and folding sewing machine as claimed in 1 wherein the inner and outer casings for the main arm and needle assembly is able to lock in its outer and innermost telescopic positions.

7. A telescopic and folding sewing machine constructed and arranged as herein described with reference to Figs. 1 to 5 of the accompanying drawings.