DE8803094U1 - Articulated saw - Google Patents

Description

Description

The technical possibilities made possible by the use of modern computer systems led to the construction and application of a four-bar linkage based on mathematical formulas and calculations. Linear guides, especially crank linear guides, are characterized by their special character, which is precisely tailored to the ^technical requirements and thus demonstrates the universal application of this type of mechanism.

The 4-link gear is a mechanism designed for installation in machines and devices.

and is characterized in that the dimensions are determined as follows:

The path of the straight guide is defined by the variables &khgr; and y , the gear itself by the variables a, b, c, d, e, . (Figure 1)

Mathematical definitions and calculations

The beginning of the straight-line path is marked with x _a , the _: , end with &khgr; (Figure 2). The actual deviation

of the theoretical line was determined as y. This results in the following formulas:

&khgr; = e * ta* costj» +b 'cos 1 - c ' cos (a * sin p) 1 I d (1) + a '

y = e ' Ca* sinf + b * sin* - c * sin (a * sinp) 2 I d (2) + a * sinf

Oi* relative deviation f from the straight line is

The largest deviation in relation to the length of the 6-wheel guide is

_f „ /wax ₍₄₎ max xmax

DeT Bäüy rößsnf äk tür, &ugr;.&pgr;. the LaHyC XfiiÖA dST straight guide in In relation to the maximum construction height or width B^, this results in:

b " UgM (5) h

or the greatest possible length of the straight guide to the sum of all coupling rods gives the construction reference factor b _f .

u xmax

f a + bf c + d + e

(see picture 1).

If the maximum possible length of the straight guide is related to the length of the coupling rod, the coupling length factor k is obtained.

k _f = xmax (7)

^{d + e} (see picture 1).

Comparison of crank gear straight guide with horizontal column guides

The ball bearing or lever gear design results in higher reliability and a longer service life than horizontally arranged column guides. (Comparison between crank gear straight guides and horizontal column guides see Table 1).

Mil » · ·

Comparison between crank gear straight guide and horizontal column guide

Crank gear Column guide ⁰ longer lifespan ⁰ higher weight ⁰ easier lubrication ⁰ Clamping effect under ° better accessibility Load possible ° higher reliability ° higher friction ° higher mass inertia * moment more moving mass

Table 1

The straight guide (see Figure 3) can be retracted beyond frame point A (see Figure 1).

The construction reference factor bf (see formula (6)) is:

_b _ xmax ^_

f ⁼ a + b + c + d +

52 + 57 + 57 + 87

= 0.375

in comparison: luffing crane see 111

~ ^0&iacgr;29 &idigr;]

The coupling length factor k _f (see (7)) is: xinax 136 _{± 1>67}

Application of crank gear straight guide

The ever-increasing use of articulated gears enables designers to come up with new solutions that better meet the product's intended use. A new articulated gear linear guide is presented here, based on the formulas mentioned above (see III).

Here, an articulated gear saw is presented as an application (see Figure 4).

Description of picture 4 Articulated circular saw

The saw blade 1 is attached to the pivot point of the coupling rod with a drive and moves horizontally across the saw table 2. The entire 4-joint 4 is anchored to two defined points on the frame 3. The dimensions can be seen in the drawing. The saw blade 1 is driven by an electric motor that sits on the same axis as the saw blade.

The lifting movement is carried out either by means of a hydraulic cylinder that engages one of the two cranks, or by means of an electric motor that is driven by a rod. Smaller hand-operated machines can also be moved using muscle power; the return movement is then carried out by a spring attached to one of the cranks.

The use of the mechanism for cutting semi-finished products or bar material in the wood, stone or plastics industry in assembly lines or processing lines meets the need for such processing machines.

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Captions

Figure 1: Definition of parameters A, B fixed points a, c cranks b frame de coupling rod

Figure 2: Definition of deviation Figure 3: Crank gear straight guide Figure 4: Application of the straight guide in an articulated circular saw

&igr;&Iacgr;&Ggr;&Iacgr; .« l

»I «I ·· HH

Claims (6)

Protection claims 1.Articulated gear saw characterized in that the saw blade is attached to the drive at the articulation point of the coupling rod. 2. Articulated gear saw according to claim characterized in that the articulation point is guided horizontally above the saw table 2 . 3. Articulated gear saw according to claims 1 and characterized in that the four-bar linkage is anchored at two defined points on the frame 3 (Fig.3). 4. Articulated gear saw according to claims 1 to , characterized in that the saw is based on the principle of articulated gear straight guidance. 5. Articulated gear saw according to claims 1 to , characterized in that the lifting movement of the mechanism is carried out either by means of a hydraulic cylinder which acts on one of the two cranks or by means of an electric motor which acts via a rod. 6. Articulated gear saw according to claims 1 to characterized in that the lifting movement is carried out manually and the return is carried out by means of a spring (cross-cut saw). Sdnitzmp QesHdm