DE8625123U1 - Device for inserting a stack of paper into a paper supply cassette - Google Patents

Description

Berlin and Munich VPA 86 G 1 6 2 5 DE

'*' 5 Device for inserting a stack of paper into a paper supply cassette

The innovation concerns a paper feed device according to the generic term of claim 1. IO

Paper feeding devices of the type mentioned above are generally known and have been used successfully.

For example, DE-AS 28 16 448 discloses a device for feeding sheets of paper for a writing office machine, which has a paper supply cassette consisting of a rectangular, trough-shaped housing and has a base plate and side walls. Guide walls are inserted into the cassette parallel to the side walls and rest against the stack of paper on the sides. A pressure plate is pivotally attached to the upper end of the guide walls near the base plate. The pressure plate rests against the back of a stack of paper and is pressed into the open housing plate by a compression spring which is inserted at the lower, freely pivoting end of the pressure plate between the latter and the base plate. Corner separating tabs are attached to the lower end of each of the two side guide walls.

To remove the individual sheets from the paper stack, a separating roller is provided in the pivoting area of the pressure plate ^, which is driven by a motor. The separating roller pulls the individual sheets downwards from the stack after overcoming the separating corner flaps.

Kro 1 sun / 12.09.1986

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It is conceivable to form the paper supply cassette by means of a stationary pressure plate that can be moved along the separating roller, and by means of guide walls arranged on the sides of the pressure plates. The movable pressure plate makes it possible to adapt the paper supply cassette to different paper formats. The two pressure plates of a parallel-moving shaft, which is operated by a lever, are lifted off the separating roller. The parallel movement of the shaft is caused by two gears that are distributed at both ends of the shaft and roll on racks molded onto the side walls of a frame part. '

The innovation is based on the task of specifying a paper feed device into which a stack of paper can be easily inserted.

This object is achieved according to the invention by the features specified in claim 1.

If the lever is in an intermediate position, single sheets of paper can be easily inserted into the printer.

The innovation is described below using an example shown in the drawing. Show:

Figure }. the new paper feed device in 30- front view,

Figures 2-4 show the paper feed device in side view with different positions of a lever.

The following description refers to all four figures.

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■ ·<_ 3"- " ' VPA The paper feed device is essentially formed by two pivoting pressure plates 1, 2 and a separating roller 3. The pressure plate 1 is mounted in a fixed position, while the pressure plate 2 is mounted so that it can move along the separating roller 3, for example on an axis fixed between the side walls of the printer housing in the upper part of the pressure plates. The paper is moved sheet by sheet from the paper feed device to a writing or printing station arranged below it. This writing station with the associated platen and the pressure device is not shown here.

Guide walls 4 are arranged on the sides of the pressure plates 1, 2 in their upper part*, which together with the pressure plates 1, 2 form a so-called paper supply cassette. At the lower end of each guide wall 4 there is a separating corner flap 14. These corner flaps 14 are rotatably mounted on the guide walls 4 via metal strips 15*

A support surface 16 is provided beneath the paper supply cassette, which is firmly connected to the printer housing. A stack of paper 5 rests on this support surface 16. The support surface 16 extends so far in the direction of the separating roller 3 that the paper pulled from the stack of paper 5 can be moved freely downwards.

The pressure plates 1, 2 or the inserted paper stack 5 are pressed against the separating roller 3 by springs that are not specified in more detail. For this purpose, the pressure plates 1, 2 are pivotally attached to the printing housing or to a removable part of the same.

The corner flaps 14 grip under the support surface 16. When the pressure plates 1,2 are pivoted away from the separating roller 3, the corner flaps 14 follow this movement up to the specified middle position of the pressure plates 1,2 (see Figure 2). When the pressure plates 1,2 are pivoted further, the corner flaps 14, or the metal strip 15 to which they are attached, are pivoted away from the pressure plates 1,2 in the opposite direction by a stop 17 attached to the printer housing (see Figure 3). In this pivoted position of the pressure plates 1,2, the paper stack 5 can be inserted into the paper supply cassette. When the pressure plates 1,2 are pivoted back to the separating roller 3, the corner flaps 14 then rest on the paper stack 5. In the position where the pressure plates 1, 2 are pressed against the separating roller 3, the paper stack 5 is then placed against the separating roller 3.

In a middle position, the pressure plates 1, 2 or the paper stack 5 are pivoted away from the separating roller 3 and the corner flaps 14 are still resting on the paper stack 5 (see Figure 4). In this position, a single sheet of paper can easily be pushed through between the pressure plates 1, 2 or the paper stack 5 and the separating roller 3. This path is marked with an arrow in Figure 4.

According to the innovation, a U-shaped bracket 6 is provided for pivoting the pressure plates 1, 2, which is rotatably mounted in two bearing elements 7, 8. The two bearing elements 7, 8 are arranged to the side of the pressure plates 1, 2 and are connected to the housing of the pressure device or to a removable part of the same. A middle leg 9 of the U-shaped bracket 6 is in the lower area

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',, y _PA &Kgr;&bgr; 1 62 5DE of the pressure plates 1,2 are hinged behind the separating roller 3 as seen from this ¹ ?, so that when the bracket 6 is pivoted, the pressure plates 1,2 can be pivoted away from the separating roller 3«

Furthermore, according to the innovation, a pivotally mounted lever 10 is provided*, the axis of rotation of which is arranged parallel to the center arm 9 of the bracket 6 or to the pivot bearings 7, 8. The lever 10 has a projection 11 on a lever arm 12 that is aligned in the axial direction.

which rests on a lateral leg 13 of the bracket 6. When the lever 10 is rotated, the bracket 6 can thus be pivoted.

The bracket 6 and thus the pressure plates 1, 2 can be pivoted together into their three positions using this lever 10.

The lever 10 can be locked in these three positions, for example. These locking elements are not shown in the drawing.

2 Protection claims
4 figures
25

Claims (2)

Protection claims 11 "-&ogr;'- ■·' '1VPA 86 6 1 62 5DE 1 ····· ■ IBtIi &igr;, a 1. Paper feed device for a printing device for removing individual sheets of paper from a paper supply cassette, which is formed by a pressure plate (1, 2) that is mounted in a fixed position and can be moved along a separating roller (3) and by guide walls (4) arranged laterally on the pressure plates (1, 2), and which has separating corner tabs (14), characterized by a U-shaped bracket (6) that is mounted laterally on the pressure plates (1, 2) and whose middle leg (9) is articulated behind the pressure plates (1, 2) in their lower area. 2. Paper feed device according to claim 1, characterized by a rotatably mounted lever (10), the axis of rotation of which is aligned parallel to the central leg (9) of the bracket (6) and which has an axially aligned projection (11) which rests against a lateral leg (13) of the bracket (6).