RU1792314C - Machine for leveling parts of shoes in thickness - Google Patents

Abstract

Usage: the invention relates to the shoe and leather industry. SUMMARY OF THE INVENTION: a machine for leveling shoe parts in thickness comprises a pair of transporting drive rollers mounted above the bed one above the other, a knife and a drive for its reciprocating movement in a direction perpendicular to the direction of supply of the product. The knife is placed between the drive conveyor rollers. The mechanism of the reciprocating movement of the transporting drive rollers is installed with the ability to move in antiphase with the reciprocating movement of the knife, keep the eccentric mounted on the drive shaft in antiphase, the eccentric of the knife, an additional connecting rod connected at one end, and the frame installed with in the bz a reciprocating movement coupled to the conveyor drive rollers and the cam. 3 silt

Description

The invention relates to the processing of materials by cutting and can be used to level shoe parts in thickness and double the leather semi-finished product in the shoe and leather industries of light industry.

A known machine for leveling the details of the bottom of the shoe in thickness, containing two drive transport rollers mounted one above the other on the bed, one of which is spring loaded and carries flutes on its working surface, a knife placed between the drive conveyor rollers to rotate them relative to the horizontal axis, which in order to improve quality

the cutting surface of the part, there is a mechanism for reciprocating its movement in the direction perpendicular to the direction of supply of the product, consisting of a connecting rod with an eccentric mounted on the drive shaft, a gear rack connected at one end to the connecting rod, and its body with a knife, two pairs of bevel wheels mounted on the frame on both sides of the rack with the possibility of interaction with it, and two ratchet mechanisms placed on both sides relative to the rack and made in the form of gear segments with levers mounted on the respective axles of the bevel gears and ratchets, mouth X |

45 Yu OJ

 CA

updated on respective axles, two pairs of bevel wheels.

This machine, through the changes introduced into it, significantly reduces energy costs for cutting, improves the quality of the cutting surface of the part.

But the following disadvantages appear in the machine; great vibration caused by the presence of unbalanced masses. This is due to the fact that the knife with the rail have a reciprocating motion, while the conveyor rollers remain motionless with respect to it. In addition, the cutting speed remains still low.

An object of the invention is to increase labor productivity by increasing cutting speed and reducing vibration.

This goal is achieved in that in a machine for leveling shoe parts in thickness, containing a pair of transporting drive rollers mounted one above the other on the bed, one of which is spring loaded and carries riffles on the working surface, a knife placed between the drive conveyor rollers by means of its reciprocating mechanism translational movement in the direction perpendicular to the feed direction of the product, consisting of a connecting rod with an eccentric mounted on the drive shaft, a gear rack connected to one m end with a connecting rod, and with its body with a knife, two pairs of bevel wheels mounted on the frame on both sides of the rack with the possibility of interaction with it and two ratchet mechanisms placed on both sides relative to the rack and made in the form of gear segments with levers mounted on respective axles of two pairs of bevel gear wheels and ratchet dogs mounted on respective axles of two pairs of bevel gears, according to the invention, the machine is equipped with a reciprocating mechanism 's translational movement of the conveying drive rollers mounted movably in protivofa- se with reciprocating blade comprising a cam mounted on the drive shaft in antiphase exciter blade, the additional connecting rod connected at one end with a teat ex. and a frame mounted for reciprocating movement and connected to the conveyor drive rollers and the cam.

This design solution distinguishes the claimed machine from the prototype in that the joint reciprocating movements in antiphase of the knife and the transport rollers make it possible to increase the feed speed of the part to the knife due to the increase in the speed of movement of the knife relative to the part, and also allows balancing the masses of moving parts machines, which in turn significantly reduces the vibration of the machine.

An increase in cutting speed is achieved as follows.

In a machine selected as a prototype, the kinematic cutting angle is determined by the formula

Vh.

Ki

Vni

where VH is the knife speed;

Vni is the speed at which parts are fed to the conveyor rollers.

In the invention, the conveyor rollers are capable of reciprocating movement. Accordingly, the formula for determining the kinematic angle of cutting should undergo the following changes:

K2

VH + VB

V

P9.

where VB is the speed of movement of the conveyor rollers.

If we equate the left parts of the expression for the kinematic cutting angle Ki and K2, these angles will be equal, because UP2 2 We obtain the following equalities;

St Vni

 Un + Uv Vn2

Hence the feed rate in the second embodiment

v Uh (Un + UR) vf, .. Uh Vn2 ----- ---- - V1 (1 + -y).

And since in the second case the speeds of the knife and transporting rollers are equal, i.e. Uv vh then

.

In accordance with these calculations, the proposed design change increases the cutting speed, and therefore it is possible to double the feed rate of the part to the conveyor rollers, thereby

to increase the productivity of the machine as a whole ...

In turn, the vibration reduction of the machine is achieved in the following way.

In the prototype, only the knife has a linear speed of all the elements of the machine involved directly in the cutting of the part. This is the linear speed of the transporting rollers, equal to zero x In other words, only the knife has kinematic energy. As a result of this, vibration of the machine occurs, folding out of the vibrations associated with the operation of the drive and other rotating elements of the machine, which reduces the life of the machine and increases the wear rate of its elements.

Thus, only one driving mass (knife) appeared in the prototype, which leads to the appearance of unbalanced mass in the machine.

An indicator of the theoretical absence of vibration in the machine can be the equality of the kinetic energies of the moving machine elements in question. These elements in the proposed design are a knife and transport rollers, which have the possibility of reciprocating motion in antiphase to each other, i.e. En Ev, where En is the kinematic energy of the knife; Ev kinetic energy of transport rollers. This expression can be written as follows:

tn tv uv

g-

In this case, Un UV, where Un is the knife speed; UV - the speed of the transporting rollers; hl - the mass of the knife; TV is the mass of rollers.

This achieves a reduction in machine vibration.

The masses of the knife (t) and rollers (tv) are slightly different from each other, respectively, this does not affect the occurrence of vibration of the machine.

In this way, vibration is suppressed by the counter motion of two masses moving at the same linear speed.

Fig. 1 is a kinematic diagram of a machine; figure 2 - machine, General view; Fig. 3 is the same side view.

The machine contains the upper 1 and lower corrugated 2 conveying rollers kinematically connected to each other by a pair of gears 3, the knife 4 is mounted on a gear rack 5, which is connected by a connecting rod 6 and an eccentric 7 with an electric motor

5 10 15 20

25 30

35

45

0

0

5 8. The gear rack 5 is engaged with the gear segments of the levers 9 and 10, pivotally mounted dogs 11 and 12 are engaged with the ratchet wheels 13 and 14 mounted on the axles 15, together with the bevel gears 16 and 17, the input meshing with bevel wheels

18 and 19, which are fixed on both sides of the upper conveying roller 1. A stack of parts is located in the hopper, the lower of which 20 lies on the conveyor belt 21, kinematically connected to the lower conveying roller 2 by means of a gear transmission 22. The conveying rollers 1 and 2 are kinematically connected with a frame 23, by means of which they make a reciprocal movement due to kinematically connected with the frame of the additional connecting rod 24 and the eccentric 25. The additional eccentric 25 is kinematically connected to the eccentric 7 wherein m is their eccentricity in opposite phases.

The machine operates as follows.

When the motor 8 is turned on, the lower part 20 is separated from the foot and is conveyed by the conveyor belt 21 into the gap between the upper 1 and lower 2 transport rollers, which capture and feed the part to the knife 4, which performs reciprocating movement together with the rail 5 from the electric motor 8 by means of an eccentric 7 and the connecting rod 6. Moreover, the transporting rollers 1 and 2 perform intermittent rotational movement from the gear rack 5 and the reciprocating movement 6 in antiphase to the movements of the knife along the axis of rotation by means of frames and 23, which is pivotally connected to an additional connecting rod 24. which in turn is kinematically connected to an eccentric 25 mounted on the shaft of the electric motor 8 in antiphase to the eccentric 7, which ensures the movement of the knife 4. When the rail 5 moves to the left, the levers 9 and 10 are rotated along clockwise. In this case, the dog 11 engages with a ratchet wheel 13, which, through the bevel gear 16 and the wheel 18, rotates the upper 1, and through the gear 3, the lower 2 transporting rollers. The dog 12 at this moment slips along the teeth of the ratchet wheel 14. When the rack 5 moves to the right, the levers 9 and 10 are rotated counterclockwise. Dog 12 engages with ratchet wheel 14 and via bevel gear 17 and wheel

19 rotates the transport rollers

in the same direction, and the dog 11 slides along the teeth m of the ratchet wheel 13.

Thus, when the knife 4 moves, then the conveyor rollers 1 and 2 move to the right. Such a constructive solution allows damping vibration caused by the force of movement of these working bodies directed in opposite directions. In addition, due to these movements of the working bodies, the cutting speed is doubled, since the velocities of the transporting rollers and the knife are added.

The use of the invention in comparison with the prototype allows to increase productivity by increasing the cutting speed; reduce vibration, thereby increasing the reliability of the machine and its life; get an annual economic effect of $ 1,500. per machine DN when using the present invention at the production and experimental shoe association Kiev.

Claims (1)

The claims A machine for smoothing shoe parts in thickness, containing a pair of transporting drive rollers installed one above the other above the bed, one of which is spring loaded and carries On the working surface of the riffle, a knife placed between the drive conveyor rollers by means of its mechanism I of translational movement in the direction perpendicular to the feed direction of the product, consisting of a connecting rod with an eccentric mounted on the drive shaft, a gear rack connected at one end to the connecting rod, and its body with a knife, two pairs of bevel wheels mounted on a bed with two sides of the rack with the possibility of interaction with it and two ratchet mechanisms placed on both sides relative to the rack and made in the form of gear segments with levers mounted on the corresponding axes, two pairs of onion gear wheels and ratchet dogs mounted on the respective axles of two pairs of bevel wheels, with the sf s os h so that in order to increase labor productivity by increasing the cutting speed and reducing vibration, it has a return mechanism - the translational movement of the conveyor drive rollers installed with the possibility of moving in antiphase with reciprocating movement of the knife, containing an eccentric mounted on the drive shaft in antiphase, the eccentric of the knife will complement an integral connecting rod connected at one end to the eccentric, and a frame mounted with the possibility of reciprocating movement and connected to the conveyor drive rollers and the eccentric. FIG. 2