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Sewing machine

A technology for sewing machines and casings, which is applied in the direction of sewing machine components, sewing equipment, sewing machine control devices, etc., and can solve problems such as drive motor starting, switch contamination, labor accidents, etc.

Inactive Publication Date: 2005-09-28
DURKOPP ADLER AG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The disadvantage of this known sewing machine is that the switch must be separately mounted on the casing and wired
In addition, the above board must be mounted on the table and must be adjusted to reliably produce the on-off state of the switch
However, if the switch is inadvertently operated in the maintenance position, the drive motor may start to cause labor accidents
Furthermore, there is a risk that the switch becomes soiled during operation, so that (the switch) no longer operates safely, so that the switch may be switched on even in the maintenance position

Method used

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Examples

Experimental program
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Effect test

Embodiment Construction

[0019] The sewing machine has a casing which is composed of an arm 1 and a base plate 2 fixed to the arm 1 and accommodates a drive system such as a drive motor 3 and an arm shaft 4 which constitutes a synchronous / positive A timing (toothed) belt 5 is connected to the main shaft of the drive motor 3 . The casings 1 , 2 are pivotably mounted on a tabletop 7 via a hinge 6 . The solid line in Fig. 2 shows the sewing machine in the vertical operating position A, while the broken line shows the sewing machine in the maintenance position B.

[0020] A printed circuit board 8 is arranged inside the arm 1 at the same height as the arm shaft 4; this printed circuit board is electrically connected via a wire 9 to a control system 10 which in turn is electrically connected via a wire 11 to the drive motor 3 . A protection device 12 is placed on the printed circuit board 8 ; this protection device 12 is also electrically connected to the drive motor 3 .

[0021] The protective device 1...

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PUM

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Abstract

The sewing machine is provided with sewing machine cases (1, 2) arranged on an upper table surface (7) so that it can be driven from an operative position (A) to a maintenance position (B). The sewing machine is provided with a driving motor (3) which connects with a main shaft (4) of the sewing machine and makes rotary action. A safety device (12) is provided and the safety device (12) has a switch which blocks power supply to the driving motor (3) when the sewing machine cases (1, 2) are driven to the maintenance position (B). The switch (20) is a lead switch (20) which is designed to operate with gravity and arranged on a printed circuit board (8) connecting to a control system of the driving motor (3). The lead switch (20) operates inductively with a permanent magnet which is guided / arranged within the casing arranged on the printed circuit board (8) so that it can be displaced.

Description

technical field [0001] The present invention relates to a sewing machine comprising a housing fixed to a tabletop and pivotable from an operating position to a maintenance position; a main shaft accommodated within the housing; a main shaft connected to the main shaft for a drive motor for rotary actuation; and an electrical protection device connected to a drive motor, the electrical protection device having a switch that disconnects power to the drive motor when the housing is pivoted to the service position. Background technique [0002] A sewing machine of this type is known from the operating manuals 1051, 1053, 1181 and 1183 of the Pfaff company. [0003] To enable maintenance work, the sewing machine is pivotable from an operating position to a maintenance position. Especially with direct drive sewing machines, it must be ensured that any (unintentional) start-up is avoided when the machine housing is in the maintenance position, in order to eliminate injury to the o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D05B83/00D05B69/00D05B69/22D05B69/36D05B75/00H01H35/02H01H36/00
CPCD05B69/00H01H36/0033D05B75/00D05B69/36D05D2207/06H01H35/022
Inventor C·黑克纳
Owner DURKOPP ADLER AG
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