DE2130043A1 - Electric scissors - Google Patents

Description

W. 24 730/71 12 / Sch

Or. E. How: | 8'i.J. Diploma W. Kienann 4R ft 71

DrHRxYdrGlpiifigCGeraharrft ^{1Oe Dl}

Patent attorneys

Hamburg 50 - Königstrasse 28

The Singer Company

Elizabeth, New Jersey (V.St.A.)

Electric scissors

This invention relates to power operated electric scissors, and more particularly to s ^ f -sine hand held electric cloth cutter adapted for rapid power cutting and for hand controlled cutting or snipping.

According to the invention, an electric scissors is created, which has a housing in which an electrically operated motor is arranged. Furthermore are a usually fixed counter-blade or cutting blade and a second blade are mounted or mounted in the housing. supported, of which the second blade can be set in oscillating motion by the motor. Also is a Drive means are provided, which connects the motor and the second blade to one another, to the second blade to swing in and out of cooperating cutting engagement with the usually fixed blade. According to According to the invention, a holding device is provided to enable the counterblade, which is usually fixedly arranged or cutting blade optionally in cutting engagement

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can be moved with the second blade to make a cut.

The invention is explained below with reference to the drawing, for example.

Fig. 1 is a side view of an electrical

Scissors according to a first embodiment of the invention, with certain parts broken away and certain parts shown in section. and wherein the anvil blade in solid lines in its normal stationary position ψ and in broken lines in position

is reproduced in full cut. Figure 2 is a perspective view of a detail

of the scissors according to Fig. 1. Fig. 3 is a riding view of an electric Scissors leave a second embodiment of the Invention, with certain parts broken away and certain parts shown in section and where cLxö counterblade in solid lines in their usual stationary position and in broken lines in the position full Section is shown. Fig. 1 shows an electric * scissors 10 according to the Invention comprising a housing 12, which preferably has two shaped sections, not shown Screws are fastened together. In the housing 12, an electric rotary motor 14 is arranged, the one rotatable output shaft 16 has.

A cutting blade 18 is pivotably mounted in the housing 12 on a pivot axis or pivot pin 20, and it is driven from the output shaft 16 of the motor by any drive means 22 which is able to convert rotary motion into pivotable oscillating motion. A drive device that does this can perform, is shown in Fig. 2 and it has

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a crank 24 which is connected to the shaft 16 and has an eccentrically arranged crank pin 26. A yoke part 30, which has two legs 32 and 34, is attached to the rear end 28 of the blade 18, between which a slotted block 36 is arranged in the transverse direction, the slot of which is substantially runs parallel to the pivot pin 20. Two bolts 40, only one of which is shown, are used for attachment of the block 36 between the yoke legs 32 and 34- » to allow limited pivoting movement of the block 36. When in operation the motor shaft 16 rotates the crank 24, drives the crank pin 26, the yoke 30 and the blade 18 via the block 36 in the form of pivoting movements about the pivot pin 20 at. The slot 38 effectively limits movement of the yoke 30 to a single plane, generally perpendicular to the pivot pin 20.

In order to produce a power-driven cut during normal work, the blade 18 works against one Counterblade 42 by moving itself by means of pivoting movements in and out of cooperative cutting engagement with the blade 42. Note that the 3f section along a very small part of the blades 18, 42 takes place because the swinging movement of the blade 18 is small. To during during normal cutting, the counterblade 42 is fixed in place hold, but allow the anvil blade 42 to move while making individual cuts, is the Counterblade 42 is pivotally attached to pivot pin 20 independently of blade 18. The counter blade 42 is biased about the pivot pin 20 in a usually stationary position in a direction in which the endeavor consists of separating the cutting edges of the two blades 18, 42 from one another, i.e. in a counterclockwise direction according to FIG. namely by means of a torsion spring 44.

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A stop 45 is used to stop the movement of the blade 42 to limit counterclockwise so that the spring 44 need not be of excessive size. The leather 44 is mounted on a projection 36, the part of the device for securing the can form molded housing sections. One end of the spring 44 is arranged so that it is against a stop member 48 while its other end is bent so that it fits securely into a hole 50 in the blade 42. The arrangement of the hole 50 is such, - that the torque the spring 44 on the blade 42 generates a bending moment relative to the pivot pin 20, so that the cutting edge of the Blade 42 is biased away from the cutting edge of blade 18, if not and until spring 44 is compressed is.

If it is desired to make a snippet cut or individual cuts with the scissors according to FIG. 1, If the operator simply presses the counterblade 42 against a table-like surface and rolls the housing 12 there relative to this blade 42 in order to generate a bending moment on the blade 42, which the bending moment according to the Force of the spring 44 overcomes. This changes the spring to that shown in broken lines in FIG. 1 Position compressed, and the counter blade 42 is moved so that it is with a part or with the whole The cutting edge of the blade 18 comes into contact to make a cut with the blade 42.

In the embodiment according to FIG. 1, a surface is of course required against which the counter blade 42 can be pressed to make a cut. It is often desirable to have a pair of scissors with the one without With the help of such a surface, a single cut or snippet cut or the like can be made. In Fig. FIG. 11 is one embodiment of electric scissors 110 shown with this possibility. An electric rotary motor is located in a housing 112 of the scissors 110 114 arranged, 'which has an output shaft 116. One

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The cutting blade 118 is pivotally mounted on a pivot pin 120 in the housing 112 and is driven by the Shaft 116 is pivoted or oscillated by a crank 124 attached to shaft 116 and has a crank pin 126 that supports the blade via a yoke portion 130 attached to the rear end 128 of the Blade 118 is attached, set in oscillating motion. This drive is similar to the drive that is related with the embodiment of FIG. 1 described and in Pig. 2 is shown in detail

The blade 118 works against an anvil blade 142 to make a cut along a small portion of the blade · The counter blade 142 is on the pivot pin 120 is pivotally mounted and is in a usually stationary position shown in solid lines pre-tensioned, namely by means of a resilient, attached Lever arrangement, which is described below

A handlebar is attached to a bolt 129 in the housing 1 ^ 2 131 pivotally mounted which at one end has an open slot 133 and near its other end one Has bolt 135. A bolt is attached to the blade 142 in a location relative to the pivot bolt 120 such that the blade 142 is usually in the position shown in FIG. 3 in position shown in solid lines is biased. The bolt 137 is fitted in the slot 133 to the To hold blade 142 against movement independently of the handlebar 131. A second link 141 is at the rear end of the housing 112 is pivotally mounted by means of a bolt 143 and can be engaged with the bolt 135 step. A leaf spring 144 acts on the link 131 to detach the counter blade T42 from the swingable blade 118 away and towards a stop member 145, which is similar to the stop 45 to bias.

As can be easily seen from FIG. 3, the embodiment consisting of the spring 144 and lever arrangement is such that

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the counter blade 142 is biased counterclockwise around the pivot pin 120 and through it The position shown in solid lines remains until the force of the spring 144 is overcome. this is the Position of the counterblade 142 during the normal power-driven Cutting. If it is desired to make a single cut or single cuts by hand, the operator simply presses on the handlebar lever I4l, whereby the bolt 135 on the handlebar moved and the handlebar 131 is pivoted about the bolt 129, so that the spring 144 is compressed over the slot 133 of the handlebar 131, a force is then applied to the bolt 137 on the counter blade 142, so that the rings 142 pivoted in a clockwise direction (according to FIG. 3) becomes, as · it 5η Fig. 3 by broken lines is shown to make a cut.

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Claims (8)

Claims ί1. ^ Electric scissors with a housing in which a electrically operated motor, a usually stationary counterblade and a second blade are attached, of which the latter can be set in oscillating motion by the motor, and with a drive device which drives the motor with the second blade connects to the second blade in and out of cooperating cutting engagement with the usual to swing stationary counterblade, characterized by a device (44 or 144, 131, 141) for optional movement the usually stationary counterblade (42 or 142) in cutting engagement with the second blade (18 or 118) independent of the motor drive. 2. Electric scissors according to claim 1, characterized in that the means for selectively moving the usually stationary counterblade (42 or 142) a pivoting device (20 or 3,20) for the pivotable support of the Counterblade in the housing (12 or 112), and a resilient device (44 bz * i. 144) for biasing the counterblade the pivoting means in a direction in which the blades are separated. 3. Electric scissors according to claim 2, characterized in that the resilient device is a torsion spring (44) one end (50) of which on the counter blade (42) at such a point with respect to the pivoting device (20) is attached that when the counterblade (42) is selectively relative to the pivot means (20) in cutting engagement with the second blade (18) is moved to make a cut, the spring (44) from the normal to an energy storage position is squeezed. 109882/0182 4. Electric scissors according to claim 2, characterized in that the resilient device (144, 131, 141) has a Lever device (131, 14l) which is connected to the counterblade (142) and pivotably attached to the housing (112), and a spring (144) engaged therewith for biasing the lever means, the lever means (131, 14l) with the counterblade (142) with respect to the pivoting device (120) at such a point is connected that the counterblade (142) around the pivoting device (120) is biased away from the second blade (118), and that the lever device (131, 141) is optionally by hand can be pivoted relative to the housing (112) in order to compress the spring (144) and the counter blade (142) in To pivot cutting engagement with the second blade (118), to make a cut. 5. Electric scissors according to claim 4, characterized in that the lever device has a first link (l4l), a bolt (143) for pivotably attaching the first link (l4l) in the housing (112), a second link (131) having first and second ends pivotably mounted (at 129) between its ends in the housing (112) is, a device (135) which connects the first end to the first link (l4l) to the second link (131) relative to the housing (112) to move pivotably upon pivoting movement of the first link (14l), and a device (133, 137) to connect the second end of the second link (131) to the counter blade (142). 6. Electric scissors according to one of claims 1 to 5, characterized in that the second blade (18 or II8) is pivotably arranged in the housing (12 or 112) and that the motor (14 or 114) drives a second blade Has output shaft (16 or 116). 109882/0182 213-043 - 9 - 7 · Electric scissors according to claim 6, characterized in that that the pivot device (20 or 120) for supporting the counterblade (42, 142) continues to second blade (18 or 118) is pivotably supported for oscillating movement by the drive device. 8. Electric shears according to one of claims 1 to 7 »characterized in that the motor (14 or 114) is a rotary motor. 109882/0182 Le e r s e i f e