CN111748903A

CN111748903A - Needle bed cleaning device for compound needle

Info

Publication number: CN111748903A
Application number: CN202010212016.4A
Authority: CN
Inventors: 中口一人; 平原基行; 岛崎宜纪
Original assignee: Shima Seiki Mfg Ltd
Current assignee: Shima Seiki Mfg Ltd
Priority date: 2019-03-26
Filing date: 2020-03-24
Publication date: 2020-10-09
Anticipated expiration: 2040-03-24
Also published as: KR20200115230A; EP3715513A1; JP2020158914A; KR102291262B1; JP7204557B2; CN111748903B

Abstract

The invention provides a needle bed cleaning device for a composite needle, which can reliably and efficiently clean a needle bed of a flat knitting machine with the composite needle. A needle bed (2) of a cleaning tank (3) detached from a flat knitting machine and attached to a needle bed cleaning device (1) is cleaned by a liquid such as a cleaning liquid or water ejected from a nozzle (4). The nozzle (4) is attached to a head (5) that can move along the surface of the needle bed (2). Composite needles are accommodated in needle grooves of a needle bed (2). The position of the slider is maintained, and the liquid is ejected from the nozzle (4) to the driving butt of the needle body, and the needle body is moved relative to the needle groove, thereby the relative position of the needle body and the slider can be switched, and the cleaning can be reliably and efficiently performed.

Description

Needle bed cleaning device for compound needle

Technical Field

The present invention relates to a needle bed cleaning device for a compound needle, which is used for cleaning a needle bed of a flat knitting machine having the compound needle.

Background

Conventionally, a needle bed washing device for removing a needle bed of a flat knitting machine from the flat knitting machine and washing the needle bed has been proposed (for example, see patent document 1). The needle bed is formed with a needle groove extending in the longitudinal direction along the needle bed gap and accommodating the knitting needle in the forward and backward direction orthogonal to the longitudinal direction. The knitting needle has a hook at a tip end, and advances and retreats the hook with respect to a needle bed gap, and introduces a knitting yarn supplied to the hook into a needle bed at the needle bed gap to knit a knitted fabric. When knitting a knitted fabric, dust such as fluff of fibers of a knitting yarn may accumulate between a knitting needle and a needle groove or the like. The needle bed cleaning device includes a cleaning tank, a nozzle for ejecting a liquid such as a cleaning liquid to the surface of a needle bed in a state of accommodating knitting needles in the cleaning tank, and a moving unit for moving the nozzle. The dust accumulated in the needle bed is removed by moving the nozzle along the surface of the needle bed and ejecting the liquid from the nozzle.

Knitting of the knitted fabric is performed with opening and closing of the opening of the hook. The needle bed cleaning device of patent document 1 is a device for cleaning a needle bed including a latch needle that swings a latch to open and close a hook. A flat knitting machine also has a structure using a compound needle (for example, see patent document 2) that opens and closes a needle hook at a tip of a slider that slides with respect to a needle body having the needle hook. In a weft knitting machine equipped with a compound needle, a cleaning device has been proposed in which dust near a needle hook is removed by jetting gas (see, for example, patent document 3).

The cleaner of patent document 3 is used by being attached to a needle bed in a state of being attached to a flat knitting machine, and includes an air nozzle and a cam on a base body that is manually slidable in a longitudinal direction of the needle bed. The cam acts on butts provided on the needle body and the slider, respectively, and is driven to advance and retreat with respect to the needle bed gap. The air nozzles are arranged in the vicinity of the opening of the hook that is driven by the cam to open and close. The needle bed is cleaned by moving the base body, switching the needle body and the slider to different relative positions by the cam, and ejecting air from the air nozzle to the vicinity of the hook to remove dust.

[ Prior Art document ]

[ patent document ]

[ patent document 1 ] European patent No. 2841632B1

[ patent document 2 ] Japanese patent No. 2946323

[ patent document 3 ] Japanese patent application laid-open No. 2011-

Disclosure of Invention

The cleaner of patent document 3, which is directed to the compound needle, is used by being attached to a weft knitting machine, and therefore cannot remove only dust near the hook of the needle using a liquid such as a cleaning liquid. The needle bed washing device of patent document 1 cannot switch the needle body and the slider to different relative positions like the cleaner of patent document 3. The compound needle has a portion where the needle body and the slider slide, and the relative position needs to be switched to reliably clean the sliding portion. However, if the groove cam is caused to act on the butt for driving to switch the relative position, the vicinity of the butt covered by the groove cam cannot be cleaned.

The invention aims to provide a needle bed cleaning device for a compound needle, which can reliably and efficiently clean a needle bed of a flat knitting machine with the compound needle.

The present invention provides a device for cleaning a needle bed for a composite needle, which cleans a needle bed having a composite needle by using a liquid ejected toward a surface of the needle bed, the device comprising:

a nozzle capable of ejecting fluid to at least one of a needle body of the compound needle and a butt for driving the slider to switch a relative position of the needle body and the slider; and

and a position switching unit which ejects fluid from the nozzle to the butt and switches the relative positions of the needle body and the slider to be different.

In addition, the present invention is characterized in that,

the fluid ejected from the nozzle toward the butt is liquid for the washing.

In addition, the present invention is characterized in that,

includes a position holding unit that holds the butt of one of the needle body and the slider,

the nozzle ejects fluid to the butt of the other of the needle body and the slider to switch the relative position.

In addition, the present invention is characterized in that,

the slider is capable of moving forward and backward at a position closer to the needle bed than the needle hook of the needle body to open and close the needle hook, and the leading end of the 2-split fin is capable of moving forward and backward further outward of the needle bed than the needle hook,

the position holding unit holds the butt of the slider at a position where the front end of the fin enters outside the needle bed,

the position switching unit switches the relative position in such a manner as to include a position where the hook enters further outward than the front end of the fin and a position where the hook is introduced to the needle bed side than the front end of the fin.

In addition, the present invention is characterized in that,

the needle bed is mounted on a washing jig and washed,

the cleaning jig includes a protection member having a slit for accommodating a tip of the fin of the slider held by the position holding unit at a position entering outward of the needle bed.

[ Effect of the invention ]

According to the present invention, the needle bed provided with the composite needle can be cleaned by the liquid ejected toward the surface. Since the relative positions of the needle body and the slider are switched to perform cleaning, dust and the like accumulated in the sliding portion are reliably cleaned. The switching of the relative position is performed by ejecting the fluid from the nozzle to the butt, and the needle bed on which the compound needle is mounted is reliably and efficiently cleaned without using a cam or the like covering the vicinity of the driving butt.

Further, according to the present invention, the liquid used for the needle bed cleaning can be also ejected from the nozzle to the butt and used for switching the relative position of the needle body and the slider. This combination contributes to simplification and cost reduction of the apparatus.

Further, according to the present invention, since the position of one of the needle body and the slider is maintained, the fluid can be ejected from the nozzle only to the butt of the other, and the needle body and the slider can be switched so as to have different relative positions. Since the butt is held by the position holding means with respect to one of the needle body and the slider, the relative position can be reliably switched without being interlocked by the movement of the other.

Further, according to the present invention, the fin at the tip of the slider is held at a position where the fin enters outside the needle bed. The needle body can be cleaned in a state where the needle body is moved out of the needle bed by inserting the hook of the needle body further outward than the tip of the fin. Switching to the position where the hook is pulled toward the needle bed side from the tip of the fin allows the tip of the fin to be divided into 2 pieces and moved outward of the needle bed from the hook, thereby reliably cleaning the fin. The movement of the needle body is a case where the switching of the relative position with respect to the slider and the switching of the relative position with respect to the needle groove of the needle bed are performed simultaneously, and the switching can be performed efficiently.

Further, according to the present invention, the protective member of the washing jig has a slit for receiving the tip of the fin at a position to enter the outside of the needle bed. If the needle hook of the needle body is caused to enter more outward than the front end of the fin, the needle body including the fin is accommodated in the slit. When the fin and the needle body enter from the needle bed mounted on the cleaning jig and are cleaned, the fin and the needle body can be protected by the protective member from being vibrated by the injected liquid even if the plate thickness is thin due to the fine-pitch compound needle.

Drawings

Fig. 1 is a simplified perspective view showing a schematic external configuration of a needle bed washing device 1 according to an embodiment of the present invention.

Fig. 2 is a side view showing, in simplified cross section, a state in which the washing jig 11 is attached to the needle bed 2 to be washed and is assembled to the needle bed washing apparatus 1 of fig. 1.

Fig. 3 is a plan view of the needle bed 2 of fig. 2 attached to the washing jig 11.

Fig. 4 is a plan view showing the structure of the cleaning jig 11 of fig. 2.

Fig. 5 is a plan view and a side sectional view showing the structure of the flap 2d of fig. 2.

Fig. 6 is a simplified plan view showing a moving path of the head 5 including the nozzle 4 when the needle bed 2 is cleaned by the needle bed cleaning apparatus 1 of fig. 1.

Fig. 7 is a simplified side cross-sectional view showing a state in which the butt 21b of the needle body 21 of the compound needle 20 is driven by the ejection of the liquid from the nozzle 4 of fig. 1 to switch the position of the needle body 21 with respect to the needle groove 2 c.

Fig. 8 is a simplified plan view schematically showing a state in which a part of the compound needle 20 is protected by the protection member 15 of fig. 6.

[ Mark Specification ]

1 needle bed cleaning device

2 needle bed

2a needle board

2c needle groove

2d flap

3 cleaning tank

4 nozzle

5 head part

10 controller

11 cleaning jig

12 end plate

14 lower frame

15 protective member

15a slit

16 upper frame

17 butt presser

20 composite needle

21 needle body

21a needle hook

21b, 22b butt

21d slider groove

22 slider

22a fin

Detailed Description

Fig. 1 to 8 relate to a configuration and a usage state of a needle bed washing device 1 as an embodiment of the present invention. The drawings are described in sequence, and the same reference numerals are assigned to corresponding parts described above, and redundant description may be omitted. For convenience, a part which is not described in a drawing to be described or is not labeled with a reference numeral even if it is described may be described with a reference numeral described in another drawing.

[ examples ] A method for producing a compound

Fig. 1 shows a schematic external configuration of a needle bed washing device 1 as an embodiment of the present invention. The needle bed cleaning device 1 includes a cleaning tank 3, and a needle bed 2 detached from the flat knitting machine in a state where a knitting needle is provided is attached to the cleaning tank 3 and cleaned. The needle bed 2 attached to the cleaning tank 3 is cleaned with a liquid such as a cleaning liquid or water ejected from a nozzle 4. The nozzle 4 is mounted to the head 5. The head 5 moves in the forward and backward direction 2Y of the needle bed 2 along the longitudinal guide 6, and moves in the longitudinal direction 2X of the needle bed 2 along the lateral guide 7. The nozzle 4 is swingable about an axis in the longitudinal direction 2X with respect to the head 5, and an angle of the ejection direction toward the upper surface of the needle bed 2 is variable. The upper part of the casing 8 of the needle bed washing device 1 can be opened and closed by the transparent cover 9. The ejection of the liquid from the nozzles 4, the change of the ejection direction, and the movement of the head 5 are controlled by a program preset in the controller 10. In the present embodiment, the needle bed 2 is attached to the washing tub 3 via the washing jig 11, but the needle bed 2 may be directly attached to the washing tub 3.

Fig. 2 shows, in a simplified cross section, a state in which the needle bed 2 to be cleaned is attached to the cleaning jig 11 and assembled to the needle bed cleaning apparatus 1 of fig. 1. In the needle bed 2 of fig. 1, needle plates 2a are arranged at a constant pitch in the longitudinal direction 2X. Needle grooves 2c extending in the advancing/retreating direction 2Y are formed between the needle plates 2a so as to be orthogonal to the longitudinal direction 2X. In the flat knitting machine, the needle bed 2 is attached obliquely so that the needle hook of the knitting needle is fed with the knitting yarn and the needle bed gap side of the knitted fabric is made higher, but in the needle bed cleaning device 1, it is attached obliquely so that the needle bed gap side is made lower. That is, the front side in the advancing/retreating direction 2Y in fig. 1 is the needle bed 2 installed obliquely so as to be lowered toward the needle bed gap, and the end of the needle groove 2c is aligned along the needle bed gap. The lower portion of each needle plate 2a is inserted into a plate groove provided in the base plate 2b so that each needle plate 2a is supported. In the housing 8, support members 8a, 8b provided along the longitudinal direction 2X of fig. 1 support a washing jig 11 to which the needle bed 2 is attached. Since the liquid is washed in a state where the needle bed gap side is lowered, the liquid ejected from the nozzle 4 to the needle bed 2 easily drops from the end portion on the needle bed gap side along the needle groove 2 c. In the following description, a direction in which the needle bed 2 is moved out in the advancing and retreating direction 2Y and the needle bed enters the needle bed toward the needle bed gap side is referred to as "outside the needle bed".

The cleaning jig 11 is provided with end plates 12 on both sides in the longitudinal direction 2X in fig. 1. The end plate 12 has a handle 13 that can be gripped by hand during operations such as transportation. The end plates 12 on both sides are connected to each other by a lower frame 14, a protective member 15, and an upper frame 16. The needle bed 2 is attached to the lower frame 14 at a distance from the outside. The washing jig 11 further includes a protection member 15, a butt presser 17, and a receiver 18. The protective member 15 is disposed to face the outside of the needle bed 2. The receiving member 18 is provided on the back surface side of the end plate 12 and receives support from the support members 8a and 8 b.

The compound needle 20 accommodated in the needle groove 2c of the needle bed 2 includes a needle body 21 and a slider 22. The needle body 21 has a needle hook 21a at the tip on the needle bed gap side, a needle jack having a butt 21b for driving connected to the base end, and an armature 21c for needle selection using magnetic force connected to the tail end via a needle selector on the base end side. The armature 21c is covered by the upper frame 16 and is thus protected from the injected liquid during cleaning. The tip of the fin 22a of the slider 22 opens and closes the hook 21a by driving the butt 22 b. The slider 22 slides in a slider groove 21d formed in the needle body 21. The fin 22a can also enter the needle bed 2 outward so that the tip ends of the 2 pieces pass over the hooks 21 a. The needle bed 2 is attached to and detached from the flat knitting machine in a state where the compound needle 20 is inserted into the needle groove 2 c. In the cleaning shown in fig. 2, the butt presser 17 presses the base end side of the butt 22b, and is a position holding means for holding the slider 22 so that the fin 22a entering to the outside of the needle bed 2 is restricted so as not to return to the needle bed 2. The protective member 15 protects a part of the composite needle 20 including the hook 21a and the fin 22a that enter from the needle bed 2 to the outside from being vibrated by the injected liquid at the time of cleaning. A flap 2d provided on the needle plate 2a at the upper portion on the needle bed gap side penetrates in the longitudinal direction 2X in fig. 1 so that the composite needle 20 does not separate upward from the needle groove. The projection 22c provided on the fin 22a prevents the slider 22 from entering the needle bed gap side when it abuts against the proximal end side of the flap 2 d. That is, the flap 2d and the butt presser 17 hold the position where the fin 22a enters the needle bed 2 most outward, and the washing of the present embodiment is performed. The cleaning of the present embodiment is also performed by switching the position to be described later so that the hooks 21a of the compound needles 20 protrude outward of the needle bed 2. The flap 2d is made of a non-porous strip-shaped metal attached to the needle bed 2 of the flat knitting machine, but is replaced with a porous structure described later with reference to fig. 5 for cleaning.

Fig. 3 shows a state in which the needle bed 2 of fig. 2 is attached to the washing jig 11. Fig. 4 shows the structure of the cleaning jig 11. The butt presser 17 aligns the slider 22 with the position on the base end side of the regulating butt 22b at the position where the slider 22 is advanced outward of the needle bed 2 before the projection 22c comes into contact with the flap 2 d. If a member that presses both the base end side and the tip end side of the butt 22b is used instead of the butt presser 17, the position of the slider 22 can be held independently of the abutment of the projection 22c and the flap 2 d. In the protective member 15, slits 15a, which will be described later, are provided at positions corresponding to the needle grooves, and protect the vicinity of the positions of the tips of the fins 22a that enter the outside of the needle bed 2. However, as will be described later with reference to fig. 8, the relative position of the needle body 21 is switched between a position where the hook 21a enters the protection member 15 and projects outward and a position where the hook 21a is drawn into the needle bed 2 side and the fin 22a divided into 2 pieces projects outward and expands in the slit 15 a. Such switching enables reliable cleaning of the needle body 21 and the fins 22 a. When the needle body is moved to simultaneously switch the relative position with respect to the slider and the relative position with respect to the needle groove of the needle bed, it is possible to efficiently switch and reliably clean dust and the like accumulated in the sliding portion.

Fig. 5 shows the structure of the flap 2d of fig. 2 in a plan view (a) and a side cross-sectional view (b), respectively. (b) The sectional view of (B) corresponds to the sectional line B-B of (a). As shown in (a), the flap 2d has punched holes 2e, and a plurality of flaps are used in combination when the flap (a) is long in the lateral direction. The boundaries 2f between the adjacent flaps 2d are not inclined in the longitudinal direction but are inclined. The punched hole 2e is provided in such a manner that the liquid ejected from the nozzle 4 at the time of cleaning is applied to the composite needle 20 as much as possible even at the portion covered by the flap 2 d.

Fig. 6 is a simplified illustration of an example of the movement path of the head 5 provided with the nozzle 4 when the needle bed 2 is cleaned by the needle bed cleaning apparatus 1 of fig. 1. The liquid is ejected from the nozzles 4 toward the surface of the needle bed 2 having a substantially rectangular shape extending in the longitudinal direction 2X, and the head 5 is reciprocated, and the following steps are repeatedly performed: the reciprocating movement is performed once at a predetermined distance in the forward/backward direction 2Y for each single-pass movement. The liquid ejected from the nozzle 4 can use cleaning liquid containing a cleaning agent or water. The nozzle 4 can be provided in plural. The nozzle 4 or a nozzle provided separately can eject not only the liquid but also a gas that scatters the liquid adhering to the needle bed 2 side after the cleaning. In addition, when water is sprayed, hot air may be blown to dry the water.

Fig. 7 shows the following states: the butt 21b of the needle jack of the compound needle 20 is driven by the ejection of the liquid from the nozzle 4 of fig. 1, and the needle body 21 is moved forward and backward along the needle groove 2c by switching the ejection direction to switch the position. (a) The following states are shown: the needle main body 21 is driven from a position where the hook 21a projects outward of the needle bed 2 in a direction of being drawn into the needle bed 2. (b) The following states are shown: the needle body 21 is driven so that the hook 21a enters the outside of the needle bed 2 from the position where the hook is drawn into the needle bed 2. The liquid ejected from the nozzle 4 toward the butt 21b can drive the butt 21b to move the needle body 21 along the needle groove 2 c. That is, the nozzle 4 is moved in the longitudinal direction by the head 5, and the needle body 21 of the compound needle 20 provided in the needle bed 2 is moved relative to the needle groove 2c to switch the position. When the position of the needle body 21 is switched with respect to the needle groove 2c, the position of the butt 22b of the slider 22 is held by the butt presser 17, and thus the relative position of the needle body 21 and the slider 22 is switched. By such switching of the relative positions, the entire needle bed 2 including the sliding portions between the needle body 21 and the needle groove 2c, between the slider 22 and the slider groove 21d, and the butt 21b for driving is reliably and efficiently cleaned. In the position switching, the movement in the longitudinal direction 2X can be performed at a lower speed than that in the cleaning, or the ejection pressure of the liquid from the nozzle 4 can be set to a high pressure. When the position is switched by the nozzle 4 provided for cleaning, the liquid for cleaning and the liquid for position switching are used at the same time, and another configuration for position switching is not necessary, which contributes to simplification of the apparatus and cost reduction.

The switching of the position based on the ejection of the fluid from the nozzle 4 in the present embodiment is performed by a position switching unit including a head 5 that moves the nozzle 4 in the longitudinal direction, and a controller 10 that controls the ejection of the fluid from the nozzle 4, the direction of the nozzle 4, and the movement of the head 5. When the nozzles 4 are used for both the washing and the position switching, the position switching can be performed in the middle of the washing of the entire surface of the needle bed 2 as shown in fig. 6 at a position where the butt 21b can be driven at the position of the nozzle 4. The entire surface of the needle bed 2 may be cleaned before and after the switching. When the cleaning is performed with a liquid different from the fluid ejected from the nozzles 4, the entire surface of the needle bed 2 may be cleaned before and after the position switching.

The position switching nozzle 4 may be provided separately from the nozzle for ejecting the cleaning liquid, and may eject a fluid different from the cleaning liquid, for example, a gas for scattering the cleaning liquid, a liquid dedicated for driving, or a gas to drive the butt 21 b. In order to switch the relative position between the needle body 21 and the slider 22, the fluid may be ejected from the nozzle 4 to the butt 22b of the driving slider 22 while holding the butt 21b of the driving needle body 21. That is, it is sufficient that one of the butts 21b and 22b for driving the needle body 21 and the slider 22 of the compound needle 20 is held, and the fluid is ejected from the nozzle 4 to the other, so that the relative positions of the needle body 21 and the slider 22 can be switched. Since the butts 21b and 22b are held by the position holding means with respect to one of the needle body 21 and the slider 22, the relative positions can be reliably switched without being interlocked by the movement of the other. Further, at least one of the butts 21b and 22b may be driven by the ejection of the fluid from the nozzle 4 without holding the butts 21b and 22 b. For example, in the present embodiment, when one of the butts 21b and 22b is not held by the butt presser 17 or the like and the other is driven, there is a possibility that the needle body 21 and the slider 22 interlock and follow, and the relative position cannot be switched. However, in the present embodiment, if the projection 22c abuts on the flap 2d, the slider 22 is stopped, and therefore only the needle body 21 can be inserted by driving the butt 21 b. Further, if the sliding resistance of the needle body 21 with respect to the needle groove 2c is increased compared to the sliding resistance of the slider 22 with respect to the slider groove 21d, the relative position of the slider 22 with respect to the needle body 21 can be switched by driving the butt 22 b.

It is also conceivable to use a structure in which the upper support portion 2g is provided on the needle plate 2a for the needle bed 2 to be cleaned. The upper support portion 2g is used for a lower needle bed of a 2-stage flat knitting machine provided with an upper needle bed, and the like. The needle bed 2 having the upper support portion 2g can be cleaned by making the height of the nozzle 4 higher than the upper support portion 2g or by changing the height so as to avoid the upper support portion 2 g.

Fig. 8 schematically shows a state in which the distal end portion of the composite needle 20 is protected by the protective member 15 of fig. 2. The states of fig. 7 (a) and (b) correspond to the compound needle 20a and the compound needle 20b, respectively. The needle body 21 has a slider groove 21d for accommodating the slider 22. In this embodiment, the advance/retreat position of the needle body 21 is switched while maintaining the entry position of the fin 22 a. The lower frame 14 of the cleaning jig 11 has a housing hole 14a for housing the hook 21a of the compound needle 20 a. In the compound needle 20a, the hook 21a protruding from the fin 22a toward the outside of the needle bed 2 is accommodated in the accommodating hole 14a, and the needle bar portion of the needle body 21 continuous with the hook 21a is protected by the slit 15a together with the fin 22a staying in the slider groove 21 d. In the compound needle 20b, the needle body 21 is drawn toward the needle bed 2, and the tip of the fin 22a is relatively in a state of protruding beyond the hook 21 a. The 2 fins 22a are biased in the vertical direction of the drawing, which is the width direction of the slider groove 21d, and are protected in the slit 15a in a state of being opened in the width direction. The protective member 15 protects the composite needle 20 which projects outward of the needle bed 2 and is accommodated in the portion of the slit 15 a. In the compound needle 20 used in the flat knitting machine having the fine needle pitch in which the arrangement pitch of the needle grooves 2c provided in the needle bed 2 is small, the width of the needle body 21 is reduced and the plate thickness of the fin 22a is reduced, but the vibration of the needle body 21 and the fin 22a caused by the liquid ejected from the nozzle 4 can be prevented by the protective member 15.

In the present embodiment described above, the needle bed washing device 1 is directed to the needle bed 2 including the compound needles 20 shown in patent document 2. The composite needle may be a needle to be cleaned, for example, in the structure disclosed in Japanese examined patent publication No. 4-66941.

Claims

1. A device for cleaning a needle bed for a composite needle, which cleans a needle bed provided with the composite needle with a liquid ejected toward a surface of the needle bed, is characterized by comprising:

and a position switching unit which moves the nozzle while switching the relative position of the needle body and the slider so that the fluid is ejected from the nozzle to the butt.

2. A device for washing a needle bed for compound needles according to claim 1,

the fluid ejected from the nozzle toward the butt is liquid for the washing.

3. A device for washing a needle bed for compound needles according to claim 1 or 2,

4. A device for washing a needle bed for compound needles according to claim 3,

5. A device for washing a needle bed for compound needles according to claim 4,

the needle bed is mounted on a washing jig and washed,