JPH01321968A - Apparatus for needle-punching of felt on single side thereof - Google Patents

Abstract

PURPOSE: To improve the punching frequency of needles without depending on the load for penetration and drawing of needles through a felt by forming guide chips of specified height between longitudinal lines of through holes of a doffing plate disposed between a needle plate and a felt mounting plate. CONSTITUTION: A doffing plate 3 having through holes 4 for needles 5 is disposed between a needle plate 1 which is vertically movable and a felt mounting plate 2. The needles 5 arranged in longitudinal lines in the needle plate 1 along the passing direction 6 of a felt are penetrated the through holes 4 of the doffing plate 3 by the vertical movement of the needle plate 1 to penetrate the felt passing on the felt mounting plate 2 so as to form fiber loops to increase bonds among fibers of the felt tissue. In this process, a guide plate 7 having the height 0.2 to 2 times as the diameter of the through holes 4 is disposed between the longitudinal lines of the through holes 4 so as to prevent the felt surface from intruding into the through holes 4 when the needles 5 penetrating the felt are extracted.

Description

Detailed Description of the Invention [Industrial Field of Application] The present invention has at least one side plate that is movable up and down, and a scraping plate provided between a felt placement plate and this side plate, and The present invention relates to a device for needle punching felt on one side, in which the removal plate is provided with Q0 through holes arranged in columns with respect to the direction of passage of the felt.

[Conventional technology]

Since the fibers are pressed against the needle shaft when the wood is stuck into the felt, some of these fibers are carried away when the side is pulled out from the felt, so that the surface of the felt on the scraping board side is scraped. In the area of the through-holes in the plate, there is a risk of protrusion into these through-holes. As a result, the resistance to take out the felt due to the large number of 41 is increased i′1r
J, which leads to unacceptable loads and limits the achievable pricking frequency, especially in the case of higher pricking frequencies due to the vibrations of the scraping plate and take-off roller that occur. On the other hand, limitations on the piercing frequency result in limitations on the possible passage speed.

If, instead of a perforated scraping plate, thin plates spaced from one another and with through-sides are used, an increase in the felt removal resistance can be avoided due to the course of the plates in the direction of passing of the felt. However, the load-bearing capacity of such sheet scraping strips against perforated scraping plates remains limited.

Finally, it is known (Austrian Patent No. 351,280) to attach a perforated guide plate to the needles on each side of the web on the side which pierces the web from the opposite side and forms a loop. In this guide plate, grooves extending in the direction of web passage are provided on opposite web faces for accommodating the forked tips of needles which are pierced through the felt to form loops. Apart from the fact that this known device is not suitable for needle punching on one side of the web and requires a pre-needle punched web, during the formation of the known grooves, these grooves very quickly become f8 A serious disadvantage arises in that the operating capacity of the device is questionable since it is damaged and thereby blocked.

[The problem that the invention attempts to solve]

The problem underlying the invention is to avoid these drawbacks and to modify a device of the type mentioned at the outset by simple means. To make it possible to increase the frequency of piercing without having to fear unbearable loads.

[Means to resolve condyles]

According to the present invention, the scraping plate has guide protrusions that protrude from the plate surface between the columns of through holes on the felt placement plate side, and the height of these guide protrusions is This is solved by matching 0.2 to 2 times the diameter of the through hole.

Since the felt is retained by the guide protrusions of the scraping plate and these guide protrusions protrude moderately from the plate surface, the felt surface that protrudes between these guide protrusions when the side is pulled away from the felt is Do not enter the needle penetration hole. Therefore, the felt can be conveyed by roller removal between the felt placement plate and the scraping plate without periodic increases in the removal resistance. This is because the guide tabs arranged between the rows of holes extend in the direction of passage of the felt in accordance with the rows of needles and are not a pull-out resistance for the felt regions located between these guide tabs. The height of these guide projections must be selected in relation to the possible protrusion of the felt surface such that the penetration of fibers into the openings of the side through-holes is avoided. Since, on the one hand, one seeks to obtain as high a needle density as possible and, on the other hand, the guide tabs must have sufficient strength, the mutual spacing of the guide tabs generally corresponds to the diameter of the through hole, in which case the felt The possible height of the protrusion on the surface depends on the hole diameter or the mutual spacing of the guide tabs. In practice, it has been found that a lower limit of the height of the felt protrusion corresponding to 0.2 times the hole diameter is sufficient in order to be able to keep the felt withdrawal resistance sufficiently constant. . However, the height of the protrusion cannot be increased arbitrarily.

This is because there is a risk of contamination of the recesses formed between these protrusions. The upper limit of the height of the protrusion is 2 of the hole diameter.
If this is the case, a sufficient self-cleaning of the recesses between these guide tabs by the felt itself is ensured. In this regard, a particularly advantageous mounting condition is obtained if the height of the guide lug is equal to or equal to half the diameter of the through hole.

By arranging guide lugs of a predetermined height between the individual rows of holes in the scraping plate, it is possible to avoid limitations in the frequency of punctures due to the inevitable protrusion of the felt surface during withdrawal of the saw from the felt. can. Moreover, the risk of damage to the scraping plate due to a broken or bent side is small. This is because the guide tabs have a relatively large height and provide sufficient strength over the scraping plate, which is not the case with the individual guide plates.

〔Example〕 The subject matter of the invention is illustrated by way of example in the drawing.

According to FIG. 1, the illustrated device mainly includes a throat plate 1 which is driven to move up and down, for example via an eccentric transmission, a felt mounting plate 2 consisting of a thin bottom plate, and a throat plate 1. It is composed of a felt mounting plate 2 and a scraping plate 3 disposed between the felt mounting plate 2, and this scraping plate is provided with a financial hole 4 of <iH5 of the QI plate 1. These hooks 5 of the throat plate 1 are arranged in a column in the direction of passage 6 of the felt and are located on the throat plate l.
During the operation process, the felt passed between the felt mounting plate 2 and the scraping plate 3 is pierced by a roller (not shown), and at that time, fibers in the fiber structure that increase fiber bonding are pierced. A loop is stretched. When pulling out the arsenal 5, the felt is held back by the scraping plate 3 so that it is not carried towards the needle 5.

In order to prevent the protruding felt surface from entering the opening of the through hole 4 of the scraping plate 3 when the side is pulled out, the scraping plate 3 is inserted into each of the through holes 4 on the felt mounting plate 2 side. Since it has parallel guide protrusions 7 extending in the felt passing direction 6 between the columns, when the side 5 is pulled out, the surface of the scraping plate 3 moved behind these guide protrusions 7 These guide protrusions almost hold the felt in place. In this case, the height h of the guide protrusion 7 is the diameter d of the through hole 4.
It is preferable that the sail diameter corresponds to 2 or 2 times, preferably half or this diameter. Depending on the ratio of these sizes, Φf
During the withdrawal of 5, at least the surface protruding immediately around the part 1 cannot penetrate into the opening of the through hole 4, which ensures a constant withdrawal resistance for the felt. However, the height of the guide tabs 7 is not so great that there is a risk of contamination of the recesses occurring between these guide tabs 7. This is because the protruding felt surface cleans these recesses down to the surface of the perforated plate. In this regard,
A tab height of 2.5 to 3.5 mm has been found to be suitable for typical hole diameters.

[Brief explanation of the drawing]

1 is a schematic vertical sectional view of an apparatus for needle punching felt according to the invention; FIG. 2 is an enlarged view of the scraping plate of this apparatus, viewed in the direction of the felt side surface; FIG. is a sectional view taken along line 111-11T in FIG. 2. 2... Felt placement board, 3... Scraping board, 4...
・Through hole, 7...Guiding protrusion, h...Height actuator shaft

Claims (1)

[Claims] 1. It has at least one throat plate that is movable up and down, and a scraping plate provided between the felt mounting plate and the throat plate, and the scraping plate has a vertically movable throat plate. In a device for needle punching felt on one side, which is provided with needle through holes arranged in vertical rows, the scraping plate (3) is provided with vertical rows of through holes (4) on the side of the felt support plate (2). The guide protrusions (7) protrude from the plate surface between the holes, and the height (h) of these guide protrusions is the same as that of the through hole (4).
) Apparatus for needle punching felt on one side, characterized in that it corresponds to 0.2 to 2 times the diameter (d) of the felt. 2. Device according to claim 1, characterized in that the height (h) of the guide lug (7) corresponds to half the diameter (d) of the through hole (4).